CN105549113A - Scientific deep drilling site selection method of volcanic type uranium ore field - Google Patents
Scientific deep drilling site selection method of volcanic type uranium ore field Download PDFInfo
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Abstract
The invention discloses a scientific deep drilling site selection method of a volcanic type uranium ore field. The method includes following steps: S01: recognizing an area uranium mineralization background, and screening an area with good uranium mineralization background as a primary selection area via the recognition of the area uranium mineralization background; S02: recognizing whether the overall structure of each volcanic basin in the primary selection area is good for mineralization, and recognizing at least one volcanic basin whose overall structure is good for mineralization in the primary selection area as a secondary selection area; S03: selecting abnormal positions in the secondary selection area by employing geophysical and geochemical methods; and S04: determining the deep drilling site according to the abnormal positions. According to the selection method, the range is gradually reduced from large to small, the deep drilling site is determined, the process is clear, the implementation is convenient, and the deep drilling construction of the deep drilling site determined by the method can strongly guarantee smooth operation of uranium ore exploration and research work.
Description
Technical field
The present invention relates to uranium geology research field, particularly relate to a kind of Volcanics-hosted Uranium ore field scientific drilling site method of selecting.
Background technology
China's For Uranium Geology Work starts from the fifties in last century, and through the uranium exploration work of over half a century, found a considerable amount of uranium deposit, historical contribution has been made in the development for China's nuclear industry.But, up to the present, the mineral deposit degree of depth major part of discovery at 500 meters with shallow.In recent years, along with research and the increasing of reconnoitring dynamics, good industrial uranium mineralization has been found at some, 1000 meters, deep, important uranium mining area, but, the uranium formation conditions in more deep and minerogenic potentiality are then difficult to launch research work because the degree of depth is too large, such as Deep geodynamics, the relation of continent type focus effect and U metallogeny, magma-fluid Evolution, deep uranium element mechanism of element migration and concentration, a series of major issues such as uranium mineralization alteration space distribution rule only rest on the theory speculates stage owing to lacking direct geology of deep part data, the bottleneck becoming uranium ore research and reconnoitre, directly hinder the expansion that China's uranium ore resource looks for the expansion in space, ore deposit and strategic uranium resource amount.
" Continental Science Drilling " in such cases as " going deep into earth interior telescope " is particularly important and targeted with regard to what show for solving problems, implement deep Science Drilling, become and met nuclear power and national security, promote China ground to learn comprehensive strength, shorten and external uranium exploration gap, disclose China's more than 2 kilometers deep U metallogeny environment and minerogenic potentiality, the only way of the major issues such as research deep-sourced xenoliths mechanism.
Solve the key point of above-mentioned all problems, final probing site of all dropping on is selected in this focus, because only in abundant demonstration, motivated situation, select correct drilling operation place, effectively could carry out observational study to the geologic record be retained in vertical sequences, and pass through lithospheric direct observation, the fluid alteration that the material composition disclosing crustal rock occurs with protolith in mineralizing process, so the scientific appraisal in early stage and careful addressing are the first steps of deep drilling work, it is also the condition precedent that can later stage achievement in research produce a desired effect.There is no a kind of method can be determined for the purpose of uranium exploration probing site in predetermined probing region at present.
Summary of the invention
The technical matters that the present invention solves is the problem not having a kind of method can determine the probing site for the purpose of uranium exploration in predetermined probing region in prior art, and then provides a kind of Volcanics-hosted Uranium ore field scientific drilling site method of selecting.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows:
Volcanics-hosted Uranium ore field scientific drilling site method of selecting, comprises the following steps:
S01: identified region U metallogeny background
There is the region of good U metallogeny background as once selecting district by the screening of identified region U metallogeny background;
S02: the one-piece construction whether Beneficial Ore-forming once selecting each volcanic basin in district described in identification
Once select at least one volcanic basin of one-piece construction Beneficial Ore-forming in district described in identification and select district as secondary;
S03: adopt geophysics and geochemical method to select in district at described secondary and choose abnormal position
Adopt geophysics and geochemical method detect volcanic basin structure, stratum developmental state, mineralization anomaly band and ore field, two ranks in mineral deposit lead ore deposit ore-containing tectonic, thus select in district at described secondary and choose favourable one-tenth ore anomaly position;
S04: determine deep drilling site according to described abnormal position.
Preferably, step S01 is specific as follows:
To needing the region of carrying out scientific drilling to carry out airborne radioactivity survey, magnetic airborne surveys and radioactivity hydrographic survey, therefrom finding out and meeting uranium element content simultaneously and be greater than 4 × 10
-6, Determination of Potassium is greater than 2.25 × 10
-2, magnetic airborne surveys result uranium element content between 24nT ~-16nT, in radioactivity hydrographic survey water region of being greater than condition number in 0.5 ц g/l, tetra-conditions maximum once selects district as described.
Preferably, step S02 is specific as follows:
The described each volcanic basin once selected in district is reconnoitred further, determines whether it possesses following characteristics, and at least one maximum for the Characteristic Number simultaneously possessed in following all features volcanic basins is selected district as described secondary:
Feature 1: volcanic basin periphery is grown the red basin of rift, and in region, exposure has basic-ultrabasic rock arteries and veins;
Feature 2: volcanic basin structural integrity, there is diadactic structure or ternary structural, the wherein said basin with diadactic structure refers to that volcanic basin is made up of Precambrian Metamorphic Rocks substrate and top volcanics cap rock, the described basin with ternary structural refers to that metamorphosed rock base lower portion also exists formation extensive intermediate_acid mass comparatively early, eigen arranges the method pilot survey of geology measured section by the volcanic basin edge of selecting at described secondary in district, and the length of described geology measured section is between 1.5km ~ 2.5km;
Feature 3: volcanic basin structural integrity, possesses center phase simultaneously, transition phase and edge phase, described center refers to rock crystallization in pelletized form mutually, the region of crystal grain diameter >5mm, described transition phase refers to that rock is thin porphyroclastic texture of falling thick and fast, the region of crystal grain diameter between 0.5 ~ 2mm, described edge refers to that rock is glass basis porphyroclastic texture mutually, the region of crystal grain diameter <0.1mm, eigen is reconnoitred by arranging geologic prospect route, geologic prospect route is arranged from basin mediad edge, route is no less than 3, route arranges the full basin of uniform fold,
Feature 4: volcanic basin substrate is ancient rich uranium strata of metamorphic rocks, and uranium mass content is between 1 × 10
-6~ 6 × 10
-6between;
Feature 5: in volcanic basin, volcanics is based on acidity, the mass content of U is 5 × 10
-6~ 20 × 10
-6between, Th mass content is 20 × 10
-6~ 40 × 10
-6between, SiO
2mass percentage at 69% ~ 75%, K
2o+Na
2the mass percentage of O is 7% ~ 10%, and K
2the mass percentage of O is greater than Na
2the mass percentage of O.
Preferably, specific as follows to the identification step of leading ore deposit ore-containing tectonic of ore field, two ranks in mineral deposit in step S03:
Select in district at described secondary and detect mine field structure, find the superimposed district that crosses of ore field belfry, and in this crosses superimposed district, detect mineral deposit structure further, the branch of main fault is found to rupture and derivative secondary cranny, and in step S04, described deep drilling site is arranged on the region that there is branch's fracture and secondary cranny.
Preferably, select in district the step in the superimposed district that crosses finding ore field belfry at described secondary, specific as follows:
S11: adopt telluric electromagnetic sounding to detect the buried depth of the buried depth of basin structure of basement and occurrence and the structure of sedimentary cover and occurrence;
S12: the superimposed district that crosses finding described ore field belfry according to the result of detection of step S11.
Preferably, detect mineral deposit structure, find the step of the fracture of the branch of main fault and derivative secondary cranny, specific as follows:
S21: employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology and geotraverse reconnoitre the mineral deposit structure crossed in superimposed district that middle at least one detects described ore field belfry respectively, wherein, the spy line direction adopting Audio Magnetotelluric Souding technology, high-precision magnetic survey technology to detect need perpendicular to fracture direction, line-spacing controls below 500 meters, point is apart from less than 100 meters, and the precision of reconnoitring of being reconnoitred by geotraverse is not less than 1:1 ten thousand;
S22: according to the probe result of step S21, finds the branch of main fault to rupture and derivative secondary cranny.
Preferably, in step S03, adopt the step of geophysics and geochemical method identification volcanic basin structure, stratum developmental state and mineralization anomaly band specific as follows:
Adopt telluric electromagnetic sounding to detect described secondary to select Zhong Ge basin, district medium and deep and there is the complete region in the region of binary or ternary structural and stratum;
Employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology detect the depth of burial that described secondary selects each Basin Metallogenic favored site in district respectively;
Reconnoitre described secondary respectively by ray spectrometric survey, radon survey and geo-electrochemistry method and select the earth's surface in district and the mineralization anomaly of superficial part;
Described deep drilling site is located at that deep exists binary or ternary structural, stratum is complete, depth of burial is relatively shallow in step S04, there is mineralization anomaly and there is branch's fracture of main fault and the abnormal position of derivative secondary cranny.
Preferably, the step identifying surface alteration band is also comprised between step S03 and step S04, in described step S04, described deep drilling site is selected in described abnormal position and the superimposed region of described surface alteration band, wherein identifies that the step of described surface alteration band is as follows:
Select in district at described secondary and carry out geotraverse investigation, line-spacing Separation control is within 250 meters, and point, apart from controlling within 100 meters, identifies following earth's surface alteration zone:
(1) the weak mineralization anomaly alteration zone of soda feldspar+chlorite+epidote+carbonate+a large amount of illitic Metasomatic Alteration combination;
(2) Metasomatic Alteration of illite+chlorite+a small amount of fluorite+haematite combines strong mineralization anomaly alteration zone;
(3) the mineralization anomaly alteration zone of chlorite+fluorite+white mica+pyritous fluid metamorphic gold deposit;
According to the order of strong mineralization anomaly alteration zone, mineralization anomaly alteration zone, weak mineralization anomaly alteration zone, earth's surface alteration zone is sorted, sort preceding higher than the posterior grade of sequence, the described surface alteration band that prioritizing selection grade is high sees whether it exists superimposed district with described abnormal position, if there is no then continue to select the described surface alteration band of a low grade to judge whether it exists the superimposed district with described abnormal position further, till finding superimposed district, and described deep drilling site is arranged in this superimposed district.
Preferably, the step of the determination to erosion sediment thickness is also comprised between described step S03 and step S04, described deep drilling site is selected in the region that described abnormal position and the superimposed and erosion sediment thickness of described surface alteration band are less than mineralizing depth, and the step of the determination of described erosion sediment thickness is specific as follows:
System acquisition deep drilling pre-selected zone fluid inclusion sample, first carries out micro-thermometric, obtains homogenization temperature, pressure when obtaining diagenesis by temperature, then tries to achieve ancient mineralizing depth h according to formula:
h＝P/ρ×g
P is pressure
ρ is density, gets CRUST DENSITY=2.75g/cm
3
G is acceleration of gravity, gets 9.8 meter per seconds
H is the degree of depth
According to described rock original thickness in conjunction with the second erosion sediment thickness of selecting diverse location in district described in existing THICKNESS CALCULATION.
Preferably, the step of pressure when obtaining diagenesis by temperature adopts flincor software to complete.
Beneficial effect of the present invention is as follows:
Method of selecting of the present invention reduces the scope step by step from big to small and determines deep drilling site, and flow process is clear and definite, and it is convenient to implement, and carry out deep drilling construction in the deep drilling site determined according to method of the present invention can the carrying out smoothly of strong guarantee uranium exploration and research work.
Accompanying drawing explanation
Fig. 1 is the basic flow sheet of Volcanics-hosted Uranium ore field scientific drilling site of the present invention method of selecting;
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention and beneficial effect are described further.
See accompanying drawing 1, Volcanics-hosted Uranium ore field scientific drilling site of the present invention method of selecting, comprises the following steps:
S01: identified region U metallogeny background
There is the region of good U metallogeny background as once selecting district by the screening of identified region U metallogeny background; The region be identified is a larger scope normally, such as, can be nationwide, the whole province's scope;
S02: the one-piece construction whether Beneficial Ore-forming once selecting each volcanic basin in district described in identification
Once select at least one volcanic basin of one-piece construction Beneficial Ore-forming in district described in identification and select district as secondary;
S03: adopt geophysics and geochemical method to select in district at described secondary and choose abnormal position
Adopt geophysics and geochemical method detect volcanic basin structure, stratum developmental state, mineralization anomaly band and ore field, two ranks in mineral deposit lead ore deposit ore-containing tectonic, thus select in district at described secondary and choose favourable one-tenth ore anomaly position;
S04: determine deep drilling site according to described abnormal position.
Wherein, step S01 can realize especially by following steps:
To needing the region of carrying out scientific drilling to carry out airborne radioactivity survey, magnetic airborne surveys and radioactivity hydrographic survey, therefrom finding out and meeting uranium element content simultaneously and be greater than 4 × 10
-6, Determination of Potassium is greater than 2.25 × 10
-2, magnetic airborne surveys result uranium element content between 24nT ~-16nT, in radioactivity hydrographic survey water region of being greater than condition number in 0.5 ц g/l, tetra-conditions maximum once selects district as described.Certain step S01 also can adopt alternate manner to carry out, and can judge whether tested region has strong Mineralizing setting by four conditions of giving in step S01, and it is more much more favourable that condition meets.Numerical range in above-mentioned four conditions be putting the boat of known mineral deposit, the off-notes such as magnetic that navigate determine.
Volcanic type U-ore, general growth is in the volcanic basin with binary or ternary structural, namely volcanic basin is made up of Precambrian Metamorphic Rocks substrate and top volcanics cap rock, also may there is formation extensive intermediate_acid mass comparatively early in metamorphosed rock base lower portion in some cases, constructed run through between basement and cover by the rift structure of different stage different scales and volcanic collapse.Top volcanics develops and crystallization differentiation through abundant in magma chamber, and produces the preenrichment of U, Th, polycyclic magmatic exhalation of many phases, is the key producing uranium-rich massif and stratum.Therefore, above-mentioned steps S02 can realize as follows:
The described each volcanic basin once selected in district is reconnoitred further, determines whether it possesses following characteristics, and at least one maximum for the Characteristic Number simultaneously possessed in following all features volcanic basins is selected district as described secondary:
Feature 1: volcanic basin periphery is grown the red basin of rift, and in region, exposure has basic-ultrabasic rock arteries and veins;
Feature 2: volcanic basin structural integrity, there is diadactic structure or ternary structural, the wherein said basin with diadactic structure refers to that volcanic basin is made up of Precambrian Metamorphic Rocks substrate and top volcanics cap rock, the described basin with ternary structural refers to that metamorphosed rock base lower portion also exists formation extensive intermediate_acid mass comparatively early, eigen arranges the method pilot survey of geology measured section by the volcanic basin edge of selecting at described secondary in district, the length of described geology measured section between 1.5km ~ 2.5km, such as, can be 2km;
Feature 3: volcanic basin structural integrity, possesses center phase simultaneously, transition phase and edge phase, described center refers to rock crystallization in pelletized form mutually, the region of crystal grain diameter >5mm, described transition phase refers to that rock is thin porphyroclastic texture of falling thick and fast, the region of crystal grain diameter between 0.5 ~ 2mm, described edge refers to that rock is glass basis porphyroclastic texture mutually, the region of crystal grain diameter <0.1mm, eigen is reconnoitred by arranging geologic prospect route, geologic prospect route is arranged from basin mediad edge, route is no less than 3, route arranges the full basin of uniform fold, such as, article 3, when, angle between every bar is at about 120 °, substantially the position at volcanicity center and crater can be determined by the division in region, later stage is in the process of scientific drilling addressing, for different scientific research objects, the drilling position that addressing is different, when studying the maximum mineralizing depth of volcanics, drilling position selects the center phase near volcanic basin as far as possible, when studying volcanic basin structural model, drilling position is selected in the moderate transition phase of volcanics thickness as far as possible, when studying volcanic basin base internal minerogentic condition and minerogenic potentiality, drilling position need select the edge phase in basin.When determining above probing site, the contact zones region of subvolcano rock under equal conditions, first should be considered;
Feature 4: volcanic basin substrate is ancient rich uranium strata of metamorphic rocks, and uranium mass content is between 1 × 10
-6~ 6 × 10
-6between;
Feature 5: in volcanic basin, volcanics is based on acidity, the mass content of U is 5 × 10
-6~ 20 × 10
-6between, Th mass content is 20 × 10
-6~ 40 × 10
-6between, SiO
2mass percentage at 69% ~ 75%, K
2o+Na
2the mass percentage of O is 7% ~ 10%, and K
2the mass percentage of O is greater than Na
2the mass percentage of O, can also comprise following subcharacter in eigen: Th/Ta is greater than 10 usually; Several element such as La, Ce, Sr, Ba, Zr, Sc, Ti, Co goes into the red with normal Volcanic Facies ratio, and Mo, Ag produce enrichment.
Tectonic system is as the important component part of volcanic basin structural model, it is the important content of scientific drilling research, and the output of Volcanic Type Uranium Deposits controls obviously by tectonization, the tectonic system of different stage has vital effect for the location of uranium deposit, so before construction scientific drilling, must study tectonic system in pre-selected zone comprehensively, especially large structural setting is being got clear, when mine field structure, secondary cranny for main structure side studies in great detail, because ore body is deposited in the tectonic system of this rank usually, thus to ore field in step S03, the identification step of leading ore deposit ore-containing tectonic of two ranks in mineral deposit can be specific as follows:
Select in district at described secondary and detect mine field structure, find the superimposed district that crosses of ore field belfry, and in this crosses superimposed district, detect mineral deposit structure further, the branch of main fault is found to rupture and derivative secondary cranny, and in step S04, described deep drilling site is arranged on the region that there is branch's fracture and secondary cranny.
Wherein, select in district the step in the superimposed district that crosses finding ore field belfry at described secondary, can realize as follows:
S11: adopt telluric electromagnetic sounding to detect the buried depth of the buried depth of basin structure of basement and occurrence and the structure of sedimentary cover and occurrence;
S12: the superimposed district that crosses finding described ore field belfry according to the result of detection of step S11.
Detect mineral deposit structure, find the step of the fracture of the branch of main fault and derivative secondary cranny, realize by following steps:
S21: employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology and geotraverse reconnoitre the mineral deposit structure crossed in superimposed district that middle at least one detects described ore field belfry respectively, wherein, the spy line direction adopting Audio Magnetotelluric Souding technology, high-precision magnetic survey technology to detect need perpendicular to fracture direction, line-spacing controls below 500 meters, point is apart from less than 100 meters, and the precision of reconnoitring of being reconnoitred by geotraverse is not less than 1:1 ten thousand;
S22: according to the probe result of step S21, finds the branch of main fault to rupture and derivative secondary cranny.
In order to be the deep drilling site determined advantageously in the carrying out of uranium exploration, method of selecting of the present invention can also comprise the step adopting geophysics and geochemical method identification volcanic basin structure, stratum developmental state and mineralization anomaly band, specific as follows:
Adopt telluric electromagnetic sounding to detect described secondary to select Zhong Ge basin, district medium and deep and there is the complete region in the region of binary or ternary structural and stratum, optionally arrange, slotted line direction should perpendicular to fracture direction in district, and line-spacing controls below 100 meters, and point is apart from less than 50 meters;
Employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology detect the depth of burial that described secondary selects each Basin Metallogenic favored site in district respectively, it is identical with Audio Magnetotelluric Souding wire location that high-precision magnetic survey section is optionally set, slotted line direction should perpendicular to fracture direction in district, line-spacing controls below 100 meters, and point is apart from less than 50 meters;
Reconnoitre described secondary respectively by ray spectrometric survey, radon survey and geo-electrochemistry method and select the earth's surface in district and the mineralization anomaly of superficial part, optionally arrange and the line-spacing of the slotted line of three kinds of methods is arranged on less than 100 meters, point is apart from below 50 meters, and the position, hole of three kinds of measuring methods is identical;
Described deep drilling site is located at that deep exists binary or ternary structural, stratum is complete, depth of burial is relatively shallow in step S04, there is mineralization anomaly and there is branch's fracture of main fault and the abnormal position of derivative secondary cranny.
Earth's surface has good U metallogeny mark, can predict that deep has good U metallogeny prospect, at Volcanogenic Uranium ore field, judge that direct mark that earth's surface has good U metallogeny environment and a condition is the mineral alteration combination caused by regional hydrothermal activity, main alteration type is damouritization, albitization, chloritization, carbonatization, silication, fluorite, haematization etc., the alteration zone of dissimilar metamorphic gold deposit and different scales intensity and relationship to uranium ore formation are very close, usually directly control the distribution range of uranium mineralization, it is the most direct U metallogeny mark, often the growth of plane earth's surface has larger, during the higher alteration of intensity, also can should there be hydrothermal alteration activity in vertical direction mutually, instruction deep has good U metallogeny prospect.Therefore the step identifying surface alteration band is set between step S03 and step S04, the profitability of result to probing work is selected in further enhancing, in described step S04, described deep drilling site is selected in described abnormal position and the superimposed region of described surface alteration band, wherein identifies that the step of described surface alteration band is as follows:
Select in district at described secondary and carry out geotraverse investigation, line-spacing Separation control is below 250 meters, and point, apart from controlling below 100 meters, identifies following earth's surface alteration zone:
(1) the weak mineralization anomaly alteration zone of soda feldspar+chlorite+epidote+carbonate+a large amount of illitic Metasomatic Alteration combination;
(2) Metasomatic Alteration of illite+chlorite+a small amount of fluorite+haematite combines strong mineralization anomaly alteration zone;
(3) the mineralization anomaly alteration zone of chlorite+fluorite+white mica+pyritous fluid metamorphic gold deposit;
According to the order of strong mineralization anomaly alteration zone, mineralization anomaly alteration zone, weak mineralization anomaly alteration zone, earth's surface alteration zone is sorted, sort preceding higher than the posterior grade of sequence, the described surface alteration band that prioritizing selection grade is high sees whether it exists superimposed district with described abnormal position, if there is no then continue to select the described surface alteration band of a low grade to judge whether it exists the superimposed district with described abnormal position further, till finding superimposed district, and described deep drilling site is arranged in this superimposed district.
The moderate region of erosion sediment thickness is selected to carry out deep drilling work, to be conducive to launching to study to Deep geodynamics, continent type focus effect and the series of problems such as relationship to uranium ore formation, magma-fluid Evolution by scientific drilling construction, the present invention also comprises the step of the determination to erosion sediment thickness between described step S03 and step S04, described deep drilling site is selected in the region that described abnormal position and the superimposed and erosion sediment thickness of described surface alteration band are less than mineralizing depth, and the step of the determination of described erosion sediment thickness is specific as follows:
System acquisition deep drilling pre-selected zone fluid inclusion sample, first carries out micro-thermometric, obtains homogenization temperature, pressure when obtaining diagenesis by temperature, then tries to achieve ancient mineralizing depth h according to formula:
h＝P/ρ×g
P is pressure
ρ is density, gets CRUST DENSITY=2.75g/cm
3
G is acceleration of gravity, gets 9.8m/s
H is the degree of depth
According to described rock original thickness in conjunction with the second erosion sediment thickness of selecting diverse location in district described in existing THICKNESS CALCULATION.
Wherein, the step of pressure when obtaining diagenesis by temperature adopts flincor software to complete, and certainly adopts other to have the software of similar functions also passable.
Technical scheme of the present invention is further illustrated below with the example that is applied as of method of selecting of the present invention in the selection process of large-scale Uranium Ore Field Science Drilling site, phase mountain:
For selecting a scientific and reasonable deep drilling site, first must investigate thoroughly whether pre-selected zone has a favourable geotectonic position, Xiang-shan uranium ore-field is positioned at Wuyi-cloud to be opened-the Luo Xiao magmatic Arc of TaiWan, China orogenetic system Luo Xiao cloud open arc basin system, its east is adjoined with the peach mountain wide magmatic Arc of-Zhu of Cathaysia Block, and north is adjoined with the Chiang-Nan Ancient island arc of primary diamond under primary diamond district.This district's Mesozoic belongs to the north of the Pacific Ocean, Southeast China shore tectonic-magmatic zone, the southwestern end of volcanic type U-ore metallogenic belt, Hangzhoupro, Jiangxi, method of the present invention is applied on the basis of structural setting investigation and selects deep drilling site.
S01: region U metallogeny background check
Boat is put, magnetic area of navigating Anomaly investigation
Investigated by Airborne Radioactivity, in the middle part of Xiangshan volcanic basin, radionuclide amount is overall higher, and periphery, basin is then relatively on the low side.The northern mineral deposit of ore field is mainly distributed in thorium Spring layer; Western Zoujiashan deposit is distributed in thorium potassium Spring layer, and the riverhead back of the body-pit hole one line mineral deposit is then distributed in the region of thorium potassium to the transition of uranium potassium; Northern deposit distribution is in all high region of uranium, thorium, potassium.The western Zou Jia mountain of phase mountain ore field, occupy the mineral deposit such as Long An, pit hole and be positioned at uranium element radioactivity High-Field and higher field to low field zone of transition; Northern mineral deposit and high in the clouds mineral deposit, east are positioned at height field zone of transition.
From magnetic anomaly aspect, Xiangshan volcanic basin characteristics of geomagnetic field distribution is comparatively complicated, and known uranium deposit is mainly distributed in the position of low value district and high low value transition.
In scientific drilling addressing process, put according to the boat in above-mentioned known mineral deposit region, Aeromagnetic Anomalies, push away the unknown by known, select the similar region of off-note once to select district as deep drilling construction place.
Step S02: continue to reconnoitre further the following characteristics of the selected each volcanic basin once selected in district:
Feature 1: the red basin investigation of tension
In Xiangshan basin west side, due to regionality stretch extension, formed Late Cretaceous basin, piled up verrucano, glutenite, in Basin In Western north edge, red beds part onlap to volcanic series on, contact in unconformability.
Feature 2: basin style integrality is investigated
In Xiangshan volcanic basin edge, arrange the investigation of large scale geotraverse, basin style is studied, because basin edge volcanics depth of cover is less, be conducive to the research of basin diadactic structure, northern stratum, study area is made up of substrate and cap rock two parts, and substrate is mainly Mesoproterozoic Erathem black mica quartz-schist; Cap rock mainly Lower Cretaceous Series is beaten a drum acid, acid slag in top group, E Hu ridge group, and nonmarine deposit petroclastic rock and Quaternary system are remained, slide rock, alluvial deposits etc.In district, the subvolcano rock of exposure all belongs to the product of the second volcanic cycle, tomography in region is development and the succession of structure of basement, fracture direction is different, larger have the river flowing from Guizhou Province through Hunan into Dongting Lake head of approximately EW-horizontal upper fracture, horizontal ravine-Mei Fengshan rupture, north north east to Zou Jia-water distribution fracture, the formation of nappe, sedimentation, granite porphyry invade, produce all relevant with fault activities containing crack, ore deposit.
Feature 3: rock mass stratum is investigated
Outwards geotraverse investigation is carried out in the middle part of Xiangshan volcanic basin, to volcanic basin plane geologic structure, lithologic character and lithofacies situation of change is investigated, found by research, basin intermediate range exposure be substantially all broken spot ryolite: the 1. mutually broken spot ryolite in edge: tool vitrophyric texture, phenocryst content is about 30 ~ 40%, in phenocryst combination, quartz accounts for 15 ~ 20%, plagioclase 5%, alkali feldspar 10 ~ 15%, black mica 3%, phenocryst many tools cataclastic texture, all phenocrysts all suffer corrode in various degree, tool corrode bay structure and dentation fringe, crystal grain diameter <0.1mm, 2. the broken spot ryolite of transition phase: tool porphyritic texture, phenocryst combination is substantially identical with edge phase Porphyroclastic lava.Compared with edge, the feature of the broken spot ryolite of transition phase is: I. phenocryst content increases, and reaches 50 ~ 60%; II. there is zonary structure in plagioclase phenocryst, and center is andesine, and edge is oligoclase; III. matrix crystallization degree increases, and granularity is thicker, and be fine-grannular structure, crystal grain diameter is between 0.5 ~ 2mm; IV. in rock, the content of Basement Metamorphic Rocks landwaste reduces, and lumpiness diminishes; 3. the mutually broken spot ryolite in center: be positioned at Porphyroclastic lava centre.Rock tool pleocrystalline porphyritic texture, phenocryst combination is identical with transition phase rock with above-mentioned edge phase, but phenocryst is obviously thicker.Plagioclase phenocryst zonary structure is more grown, and phenocryst center is labradorite, and edge is more-andesine.Black mica phenocryst is preserved comparatively intact, the alteration completely of hornblende phenocryst major part.
Feature 4, feature 5: region uranium content background check
Xiangshan volcanic basin, primarily of metamorphosed rock substrate and volcanics cap rock composition, is 1.06 × 10 by the uranium content of systematic sampling investigation Basement Metamorphic Rocks
-6~ 6.0 × 10
-6.Wherein the chlorite zone uranium content mean value of low greenschist facies is 4.3 × 10
-6, biotite zone is 4.0 × 10
-6, the garnet zone of high greenschist facies is 3.2 × 10
-6, the staurotide band of low amphibolite facies is 2.6 × 10
-6, reflect and to increase with metamorphic grade, uranium part is taken out of, and its uranium content reduces.The cap rock of Xiangshan basin is the volcanic series in Early Creataceous Epoch, and be made up of the acidity of terrestrial facies, middle acid slag, volcanoclastic rock and a small amount of normal sedimentation interlayer, top group rhyodacite of beating a drum, the average uranium content of rock is 7.58 × 10
-6, the average uranium content of E Hu ridge group broken spot ryolite rock is 7.52 × 10
-6.
Step S03: adopt geophysics and geochemical method to select in district at described secondary and choose abnormal position
From large geology background, phase mountain ore field belongs to a part for large-scale polymetallic ore concentration area, east China metallogenic belt in secondary era, also be an ingredient of metallogenic belt, Pacific Rim, mineral deposit coal controlling different in ore field is different, same mineral deposit ore control factor is also various, but main, most important coal controlling is rift structure, the rift structure of different stage controls the uranium mineralization of different scales, and ore-controlling structure and compound thereof have obvious control action to the form of mineralized belt and ore body, occurrence, scale and space orientation.Shown by the tectonic knot of mine field structure research and typical ore deposits: the activity of (1) geofracture controls the growth of phase mountain ore field; (2) east northeast is to the distribution with EW striking fault control ore deposit collection band; (3) Output Scale and the form of ore body in the secondary fragmentation of ore field compound structure and the group control of tensile crack.
Phase mountain ore field is located in South China, and ground mulching is serious, and vegetation extremely grows, so in scientific drilling addressing process, must carry out decipher supposition in conjunction with a large amount of Geophysical-chemical means to Condition In The Depth, to ensure that deep geologic environment meets the addressing requirement of section's brill.
Bore in addressing process in whole section, lay the telluric electromagnetic sounding section (MT) 2 intersecting and cross volcanic basin altogether, completing effective MT depth measurement point 106, is that core is at identical point arrangement Audio Magnetotelluric Souding section (AMT), radon survey section, each 8 of high-precision magnetic survey section with dominant area.
(1) telluric electromagnetic sounding (MT)
According to MT profile inversion achievement, southern side, Zou Jia Shandong buried depth of basement 1400 ~ 1700m, in district Zou-Bu rupture and Zhang Jia that limit-stone chews Fault dimension is larger, deep substrate, surface survey finds that two position alteration growths that cross of rupturing, radioactivity anomaly are obvious, tectonic activity is strong, local exposure granite porphyry, is the vantage point of deep drilling probing.
(2) Audio Magnetotelluric Souding (AMT)
By the measurement of AMT section, the achievement display after inverting, dominant area stratum has ternary structural, top resistive formation, middle low resistivity zone, and deep is shown as resistive formation again, and the area of resistivity bad break may be the reflection of rift structure.According to the structure model of soil layer of L4 line AMT profile construction, obviously there is grand liter in substrate, the most deeply can reach 1600 ~ 1700m, in conjunction with ore field geology, may there is the one-level volcanic collapse structure of similar Zoujiashan deposit in the side, the southeast of basement uplift; Have in section many east northeasts to and northwestward faults, wherein, maximum with Zou Shi-water distribution Fault dimension, mineralizing tectonic setting is very favourable; Near Zoujiashan deposit, there is multiple ore deposit (change) point in its periphery, side, southeast in L4 section;
(3) radon survey
Radon survey is one of effective ways of detection deep concealed uranium ore body.By surveying district's radon consistence data rough estimates, surveying average radon concentration in district's soil is 22375Bq/m
3, mean square deviation: 21401, minimum value is 0Bq/m
3, maximal value is 444000Bq/m
3, Radon Anomaly lower limit is tentatively decided to be: 86578Bq/m
3, showing to survey the overall Soil-crop system in district higher, is U metallogeny Favorable Areas.By surveying district survey line L4, L7, L3 section Radon Anomaly and areal structure rupture and AMT inversion result is analyzed, discovery Radon Anomaly and construct consistent, the main aberrant centers that ruptures and be positioned at Zou-cloth and rupture and the position that crosses of northwestward faults.
(4) geo-electrochemistry
Application soil ion conductivity, Thermal Release Mercury of Soil and ground electricity extract three kinds of methods and predict U metallogeny position in dominant area, later stage is to U, Th, Pb, Zn, Mo and soil ion conductivity (Con) and Thermal Release Mercury of Soil (Hg) is abnormal superposes, delineation target area.According to target location, reduce section's boring position and select scope.
By selection and the combination of variety classes Geophysical And Geochemical Methods, infer decipher phase mountain deep formation structural model step by step, the zone thickness translated with the rock mass of earth's surface and superficial part, structure, mineralising, alteration and deep solution, structure occurrence, rock mass scale, volcanic vent etc., for principle, tentatively determine that deep drilling construction location is positioned at side 1.5, Zoujiashan deposit southeast km.
After tentatively determining dominant area, earth's surface U metallogeny ring condition in dominant area is investigated, and determines dominant area erosion sediment thickness:
On the basis of above-mentioned work, in order to determine section's drilling tool body opening position, need to carry out route geology investigation at dominant area, carry out section actual measurement to key sections, through previous work in phase mountain deep drilling addressing process, determined emphasis dominant area is positioned at side, the southeast, mining area, Zou Jia mountain simultaneously, three structural altered zone are found in this region, profile survey is carried out to these three alteration zones, to determine U metallogeny environment in earth's surface in district, infers deep U metallogeny prospect.
(1) important structural altered zone measured section
Zou Jia mountain I structural altered zone is positioned at Southern Shandong Province 500m place of Zou family, and NW trending Zhang Jia limit-stone is chewed fracture and NE trending fault and to be crossed the triangle zone at position.Alteration is many along cranny development, be mainly the explanation of brick-red alkali, fracture small-angle skew is chewed with Zhang Jia limit-stone, alkali explanation crack steady mode of occurrence, overall occurrence is 290 ° ~ 305 ° ∠, 78 ° ~ 84 °, 120 ° ~ 129 ° ∠ 76 ° ~ 80 °, single highly basic explanation width about 1 ~ 3cm, the wide about 6 ~ 12cm in local bulkiness place, 1m equidistant alkali explanation band is grown in local.Alteration mainly contains albitization, haematization, damouritization, carbonic acid lithification and kaolinization, how symmetrical along crack.
Zou Jia mountain II structural altered zone is positioned at stone and chews lower northwest to 600m, according to measured section figure: uranium mineralization alteration situation and I section similar, alkali explanation crack occurrence and northwestward faults small-angle skew, occurrence is 96 ° ~ 132 ° ∠ 71 ° ~ 88 °, alteration mainly contains sodium, haematization, damouritization, carbonic acid lithification and kaolinization, how symmetrical along crack.Earth's surface mineralization anomaly is fairly obvious, and U reaches as high as 356 × 10
-6(table 1).Section first wire exposure Granodiorite mass, it is abnormal that arteries and veins body both sides and inside have no uranium.Zhang Jia limit-stone chew fracture with NE trending fault intersection rock strongly broken, multiform becomes shear joint, has no stuff and hydrothermal alteration.
Table 1II structural altered zone Partial Elements is containing scale
You Jia mountain III structural altered zone measured section is positioned at You Jia Shandong 200m.Different from I, II section, the explanation crack occurrence of III section alkali and northwestward faults less parallel, occurrence is 275 ° ~ 290 ° ∠ 72 ° ~ 87 °, and radioactivity survey shows that in alteration zone, U, Th, K etc. are not high.Alteration mainly contains sodium, haematization, damouritization, carbonic acid lithification and kaolinization, how symmetrical along crack.The minor fault that in structural altered zone, growth many is parallel, in distributed fault under tectonization, forms phacoid, schistosity and cracked lithification, shows that structural belt experienced by Polyphase activity.Geologic feature in conjunction with I, II section finds: surface alteration is discontinuous, is mainly distributed in northwestward faults and NE trending fault and crosses the triangle zone at position; Weaken gradually away from the surface alteration of Zou Jia mountain, not obvious to section earth's surface, You Jia mountain radioactivity anomaly, uranium mineralization alteration is more weak, U content range 4.7 × 10
-6~ 5.9 × 10
-6.
(2) drilling position is selected
By finding No. II band after large-scale geologic prospect and section actual measurement, earth's surface Extract Mineralized Alteration is obviously better than other two alteration zones, and distance faults convergence position is nearer, article two, the mine field structure of repeatedly movable deep substrate, for alteration zone deep Cheng Kuang provides favourable passable structure and ore-hosting volcanics, the obvious U enrichment of element of earth's surface radioactivity anomaly, exposure simultaneously has can for the granite porphyry becoming ore deposit to provide continuation heat energy, above geological phenomenon not only shows that II structural altered zone earth's surface has good U metallogeny environment, and prediction alteration zone deep also has good U metallogeny prospect, for preferably deep drilling construction site.
(3) determination of dominant area erosion sediment thickness
The calculating of phase mountain ore field erosion sediment thickness, key problem is the estimation of ancient mineralizing depth, and according to data statistics, the homogenization temperature distribution range of Xiang-shan uranium ore-field scientific drilling uranium mineralization section fluid inclusion is larger, and main body metallogenic temperature interval is 220 DEG C ~ 340 DEG C.Metallogenic period and non-metallogenic period inclusion homogenization temperature overlapping region larger, but metallogenic period homogenization temperature is obviously high than the homogenization temperature of non-metallogenic period inclusion, the peripheral institute sample thief from Zou Jia mountain, metallogenic period fluid inclusions homogenization temperature is between 193.3 DEG C ~ 409.5 DEG C, span is larger, and homogenization temperature mean value is 274.9 DEG C; Non-metallogenic period inclusion homogenization temperature is between 132.9 DEG C ~ 338.5 DEG C, and homogenization temperature mean value is 232.9 DEG C.
On the basis of homogenization temperature, calculating metallogenic period Ore-forming pressure main body according to flincor software is 102.5Mpa ~ 134.5Mpa.The estimation of mineralizing depth is carried out again by Ore-forming pressure:
According to formula: P=ρ gh (P is pressure, and ρ is density, and g is acceleration of gravity, and h is the degree of depth), pushes away to obtain H=P/ ρ g.Pressure limit calculates acquisition, and CRUST DENSITY is 2.75g/cm
3, 9.8 meter per seconds.Show that phase mountain mineralizing depth is 3.73 ~ 4.89km by above-mentioned computing formula.
By calculating, ancient for phase mountain uranium ore mineralizing depth is decided to be 3.73 ~ 4.89km, and the sample collection degree of depth is-500 meters of absolute altitudes, therefore calculates ore field west area, phase mountain erosion sediment thickness and is about 3.2 ~ 4.3km.
The work of comprehensive several respects above, thinks that southern side, Zou Jia Shandong is desirable Volcanics-hosted Uranium ore field scientific drilling construction site, reason may be summarized to be following some:
1. dominant area is positioned at phase mountain fire mountain passage proximate, and research work can well reflect phase mountain fire mountain mechanism characteristics;
2. from surveyed Zou Jia mountain MT and AMT data, requirement is bored by the dominant area depth of stratum section of meeting;
3. in district, soil radon measuring is obviously abnormal, and is positioned at the I class target area of geo-electrochemistry delineation.
4. measure can find out in conjunction with AMT, this place secondary fragmentation parallel with main fracture is grown, and rupture System can be the migration of deep uranium-bearing hydrothermal solution, precipitation and enrichment and provides good structural environment.
And engineering construction exists good feasibility, in district, from engineering construction aspect, also there is good genetic prerequisite:
1. there is a Zou Jia mountain in dominant area west side to the rural highway on You Jia mountain, has a good transport service, the transport of favourable heavy mechanical equipment, installation.
2. there are many rivers to flow through in dominant area, and have artificial water channel, convenient with water in construction process.
3. dominant area distance Zou Jia mountain mining area about 2km, topographic condition is better on the way, conveniently sets up cable.
4. in dominant area, part location terrain is better, base stabilization, and surperficial Quaternary system covers more smooth, is conducive to building of operation platform.
5. dominant area vegetative coverage is fabulous, and without the exposed hillside of large area, rainy season can not produce the disasters such as mountain torrents rubble flow.
According to above step, China Uranium first scientific drilling successfully solves this key issue of probing addressing in early stage, by carrying out the drilling operation of 2818 meters in selected holes position, 4 sections of uranium mineralization are found in the volcanics of top, middle part finds multistage containing gold of lead-zinc ore, gold content is up to 1.36 grams/ton, find that in bottom the darkest standard copper mineralising average grade of China is more than 1%, thick about 1m, research finds shallow by being deep to, copper, plumbous zinc gold, uranium mineralization section metallogenic temperature and one-tenth rock salt degree show as the evolution trend declined gradually, establish lithology, magnetic, a series of Xiang-shan uranium ore-field deep drilling achievement sections such as EO-1 hyperion alteration, be successfully authenticated the theoretical model of Xiangshan volcanic basin ternary stratal configuration.In a word, the achievement that China Uranium first scientific drilling obtains, while pushing China's U metallogeny theory to a new high degree, also demonstrates correctness and the replicability of the present invention's " Volcanics-hosted Uranium ore field scientific drilling site method of selecting ".
Claims (10)
1. Volcanics-hosted Uranium ore field scientific drilling site method of selecting, is characterized in that, comprise the following steps:
S01: identified region U metallogeny background
There is the region of good U metallogeny background as once selecting district by the screening of identified region U metallogeny background;
S02: the one-piece construction whether Beneficial Ore-forming once selecting each volcanic basin in district described in identification
Once select at least one volcanic basin of one-piece construction Beneficial Ore-forming in district described in identification and select district as secondary;
S03: adopt geophysics and geochemical method to select in district at described secondary and choose abnormal position
Adopt geophysics and geochemical method detect volcanic basin structure, stratum developmental state, mineralization anomaly band and ore field, two ranks in mineral deposit lead ore deposit ore-containing tectonic, thus select in district at described secondary and choose favourable one-tenth ore anomaly position;
S04: determine deep drilling site according to described abnormal position.
2. Volcanics-hosted Uranium ore field scientific drilling site method of selecting as claimed in claim 1, it is characterized in that, step S01 is specific as follows:
To needing the region of carrying out scientific drilling to carry out airborne radioactivity survey, magnetic airborne surveys and radioactivity hydrographic survey, therefrom finding out and meeting uranium element content simultaneously and be greater than 4 × 10
-6, Determination of Potassium is greater than 2.25 × 10
-2, magnetic airborne surveys result uranium element content between 24nT ~-16nT, in radioactivity hydrographic survey water region of being greater than condition item number in 0.5 ц g/l, tetra-conditions maximum once selects district as described.
3. Volcanics-hosted Uranium ore field scientific drilling site method of selecting as claimed in claim 1, it is characterized in that, step S02 is specific as follows:
The described each volcanic basin once selected in district is reconnoitred further, determines whether it possesses following characteristics, and at least one maximum for the Characteristic Number simultaneously possessed in following all features volcanic basins is selected district as described secondary:
Feature 1: volcanic basin periphery is grown the red basin of rift, and in region, exposure has basic-ultrabasic rock arteries and veins;
Feature 2: volcanic basin structural integrity, there is diadactic structure or ternary structural, the wherein said basin with diadactic structure refers to that volcanic basin is made up of Precambrian Metamorphic Rocks substrate and top volcanics cap rock, the described basin with ternary structural refers to that metamorphosed rock base lower portion also exists formation extensive intermediate_acid mass comparatively early, eigen arranges the method pilot survey of geology measured section by the volcanic basin edge of selecting at described secondary in district, and the length of described geology measured section is between 1.5km ~ 2.5km;
Feature 3: volcanic basin structural integrity, possesses center phase simultaneously, transition phase and edge phase, described center refers to rock crystallization in pelletized form mutually, the region of crystal grain diameter >5mm, described transition phase refers to that rock is thin porphyroclastic texture of falling thick and fast, the region of crystal grain diameter between 0.5 ~ 2mm, described edge refers to that rock is glass basis porphyroclastic texture mutually, the region of crystal grain diameter <0.1mm, eigen is reconnoitred by arranging geologic prospect route, geologic prospect route is arranged from basin mediad edge, route is no less than 3, route arranges the full basin of uniform fold,
Feature 4: volcanic basin substrate is ancient rich uranium strata of metamorphic rocks, and uranium mass content is between 1 × 10
-6~ 6 × 10
-6between;
Feature 5: in volcanic basin, volcanics is based on acidity, the mass content of U is 5 × 10
-6~ 20 × 10
-6between, Th mass content is 20 × 10
-6~ 40 × 10
-6between, SiO
2mass percentage at 69% ~ 75%, K
2o+Na
2the mass percentage of O is 7% ~ 10%, and K
2the mass percentage of O is greater than Na
2the mass percentage of O.
4., as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 1, it is characterized in that, specific as follows to the identification step of leading ore deposit ore-containing tectonic of ore field, two ranks in mineral deposit in step S03:
Select in district at described secondary and detect mine field structure, find the superimposed district that crosses of ore field belfry, and in this crosses superimposed district, detect mineral deposit structure further, the branch of main fault is found to rupture and derivative secondary cranny, and in step S04, described deep drilling site is arranged on the region that there is branch's fracture and secondary cranny.
5., as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 4, it is characterized in that, select in district the step in the superimposed district that crosses finding ore field belfry at described secondary, specific as follows:
S11: adopt telluric electromagnetic sounding to detect the buried depth of the buried depth of basin structure of basement and occurrence and the structure of sedimentary cover and occurrence;
S12: the superimposed district that crosses finding described ore field belfry according to the result of detection of step S11.
6. as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 5, it is characterized in that, detect mineral deposit structure, find the step of the fracture of the branch of main fault and derivative secondary cranny, specific as follows:
S21: employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology and geotraverse reconnoitre the mineral deposit structure crossed in superimposed district that middle at least one detects described ore field belfry respectively, wherein, the spy line direction adopting Audio Magnetotelluric Souding technology, high-precision magnetic survey technology to detect need perpendicular to fracture direction, line-spacing controls below 100 meters, point is apart from less than 50 meters, and the precision of reconnoitring of being reconnoitred by geotraverse is not less than 1:1 ten thousand;
S22: according to the probe result of step S21, finds the branch of main fault to rupture and derivative secondary cranny.
7. as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 6, it is characterized in that: in step S03, adopt the step of geophysics and geochemical method identification volcanic basin structure, stratum developmental state and mineralization anomaly band specific as follows:
Adopt telluric electromagnetic sounding to detect described secondary to select Zhong Ge basin, district medium and deep and there is the complete region in the region of binary or ternary structural and stratum;
Employing Audio Magnetotelluric Souding technology, high-precision magnetic survey technology detect the depth of burial that described secondary selects each Basin Metallogenic favored site in district respectively;
Reconnoitre described secondary respectively by ray spectrometric survey, radon survey and geo-electrochemistry method and select the earth's surface in district and the mineralization anomaly of superficial part;
Described deep drilling site is located at that deep exists binary or ternary structural, stratum is complete, depth of burial is relatively shallow in step S04, there is mineralization anomaly and there is branch's fracture of main fault and the abnormal position of derivative secondary cranny.
8., as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 7, it is characterized in that:
Between step S03 and step S04, also comprise the step identifying surface alteration band, in described step S04, described deep drilling site be selected in described abnormal position and the superimposed region of described surface alteration band, wherein identify that the step of described surface alteration band is as follows:
Select in district at described secondary and carry out geotraverse investigation, line-spacing Separation control is within 250 meters, and point, apart from controlling within 100 meters, identifies following earth's surface alteration zone:
(1) the weak mineralization anomaly alteration zone of soda feldspar+chlorite+epidote+carbonate+a large amount of illitic Metasomatic Alteration combination;
(2) Metasomatic Alteration of illite+chlorite+a small amount of fluorite+haematite combines strong mineralization anomaly alteration zone;
(3) the mineralization anomaly alteration zone of chlorite+fluorite+white mica+pyritous fluid metamorphic gold deposit;
According to the order of strong mineralization anomaly alteration zone, mineralization anomaly alteration zone, weak mineralization anomaly alteration zone, earth's surface alteration zone is sorted, sort preceding higher than the posterior grade of sequence, the described surface alteration band that prioritizing selection grade is high sees whether it exists superimposed district with described abnormal position, if there is no then continue to select the described surface alteration band of a low grade to judge whether it exists the superimposed district with described abnormal position further, till finding superimposed district, and described deep drilling site is arranged in this superimposed district.
9., as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 8, it is characterized in that:
The step of the determination to erosion sediment thickness is also comprised between described step S03 and step S04, described deep drilling site is selected in the region that described abnormal position and the superimposed and erosion sediment thickness of described surface alteration band are less than mineralizing depth, and the step of the determination of described erosion sediment thickness is specific as follows:
System acquisition deep drilling pre-selected zone fluid inclusion sample, first carries out micro-thermometric, obtains homogenization temperature, pressure when obtaining diagenesis by temperature, then tries to achieve ancient mineralizing depth h according to formula:
h＝P/ρ×g
P is pressure
ρ is density, gets CRUST DENSITY=2.75g/cm
3
G is acceleration of gravity, gets 9.8m/s
H is the degree of depth
According to described rock original thickness in conjunction with the second erosion sediment thickness of selecting diverse location in district described in existing THICKNESS CALCULATION.
10. as right wants Volcanics-hosted Uranium ore field scientific drilling site method of selecting as described in 9, it is characterized in that: the step of pressure when obtaining diagenesis by temperature adopts flincor software to complete.
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