CN105807327A - Sedimentary basin base uranium fertility and sandstone-type uranium deposit mineralization potentiality evaluation method - Google Patents
Sedimentary basin base uranium fertility and sandstone-type uranium deposit mineralization potentiality evaluation method Download PDFInfo
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Abstract
The invention belongs to the technical field of uranium mines, and specifically discloses a sedimentary basin base uranium fertility and sandstone-type uranium deposit mineralization potentiality evaluation method. The method comprises the following steps: S1, comprehensively measuring aerial gamma energy spectra in a base provenance area; S2, collecting a medium acidic igneous rock sample in an aerial radioactivity measurement work area, and performing 80-mesh and 200-mesh pollution-free crushing on the sample; S3, measuring the quantity of ferrous oxide and major and minor components in the 200-mesh pollution-free powder; S4, measuring the share of active uranium in the 80-mesh pollution-free powder; S5, analyzing and arranging data about the content of uranium and thorium, the thorium-uranium ratio and the leaching rate of the active uranium; and S6, analyzing the base rock uranium fertility and evaluating the sandstone-type uranium deposit mineralization potentiality in combination with the data results of S1 and S4. The method is used for judging the uranium fertility of large sedimentary basin margin erosion source areas, and providing basis for large sedimentary basin sandstone-type uranium deposit mineralization potentiality evaluation.
Description
Technical field
The invention belongs to uranium ore technical field, be specifically related to a kind of sedimentary basin substrate Uranium content and sandrock-type
Uranium Deposits Assessment Method on Potential.
Background technology
Sandstone-type uranium mineralization with respect occupies highly important status, Ye Shi China tradition four in the uranium resource structure of the whole world
One of big industrial type uranium ore, its potential resource total amount also occupies first of the big industrial type uranium ore of China four.
Carrying out Formation of Sandstone-type Uranium Deposits law study finally must the evaluation and foreca criterion of sandstone-type uranium mineralization with respect to be implemented to
On.For a certain study area or working area, the problem first having to answer is that this area is either with or without sandrock-type
The metallogenic prospect of uranium ore？This is to evaluate.If it has, such as sandrock-type uranium deposit, they are likely distributed in assorted
Local？Which basin？Which layer position？Which location？And it is predicted.
Up to now, sandstone-type uranium mineralization with respect is formed, is distributed and " three big criterions " and " five has been gone through in discriminating
Big criterion " research history, be specifically related to " tectonics criterion, region hydrogeology criterion, ancient gas
Wait and raw after current climate criterion, lithology-petrofacies Geochemical Criterion, hydrogeology criterion and diagenesis
Effect criterion "；Aforementioned evaluation criteria is not the most classified as uranium source as the one-tenth ore deposit bar that sandstone-type uranium mineralization with respect is necessary
Part and evaluation criteria, more do not propose the share of quantitative standard and mobile uranium.Research shows: sandrock-type
The one-tenth ore deposit of uranium ore be often depending on uranium content higher and wherein " mobile uranium " (under room temperature and condition of normal pressure,
Rock is easily dissolved by faintly acid or weakly alkaline solution and enters the part uranium of liquid phase) during share is high
Acidic igneous rock.Therefore, carry out great sedimentary basins substrate erosion source region uranium source evaluation study very must
Want.
Summary of the invention
It is an object of the invention to provide a kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits potentiality
Evaluation methodology, differentiates, for great sedimentary basins the Uranium content of great sedimentary basins basin edge erosion source region
Formation of Sandstone-type Uranium Deposits Potential Evaluation provides foundation.
Technical scheme is as described below:
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, the method includes
Following steps:
Step S1: substrate erosion source region Airborne gamma energy spectrum composite measurement；
Step S2: gather Acid-intermediate igneous rock rock sample in aeroradiometric survey working area, and to sample
Product carry out 80 mesh and the pulverizing of 200 mesh.
Step S3: the powder being crushed to 200 mesh in step S2 is carried out ferrous oxide and measures fixed and element
Content complete analysis measures；
Step S4: the powder being crushed to 80 mesh in step S2 is carried out mobile uranium share mensuration；
Step S5: uranium thorium content, TURA value Ru and the work that analysis and arrangement step S3 obtains with S4
Property Uranium extraction rate AUn%.
Step S6: integrating step S1 and step S4 data result analyze basement rock Uranium content feature, comment
Valency SANDSTONE URANIUM DEPOSITS minerogenic potentiality.
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described step S1
Peripheral foot erosion source region in work basin is carried out by middle use GR-800D Airborne gamma energy spectrum Integrated Measurement System
Rock and ore radiometry.
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described step S2
In, lose source region substrate different times, difference at system acquisition basin, aeroradiometric survey working area periphery
The Acid-intermediate igneous rock rock sample of lithology.
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described step S3
In, use AB-104L and PW2404X ray fluorescence spectrometer to carry out constituent content in 200 mesh powder
Complete analysis measures.
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described step S4
Specifically include following steps: the sample being crushed to 80 mesh is first carried out total rock uranium determination, then simulates work
Make the chemical environment of water of district's modern times subsoil water, use leaching agent to soak, and take immersion and once carry out uranium content
Analyze
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described step S5
Middle statistics rock mass (stratum) title, numbering, lithology, total rock uranium thorium content, calculate uranium, thorium ratio
RUAnd mobile uranium leaching rate AU%.
A kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, described thorium, uranium
Ratio RUAnd mobile uranium leaching rate AUn% computing formula such as formula (1) shown in (2):
RU=ThT/UT (1)
AUn%=(Un/UT) % (2)
The invention have the benefit that
(1) a kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, design is cut
Access point is deep, starts with from the source controlling U metallogeny, has preferably caught the essence of problem；
(2) a kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, gather sample
Product object, analysis test request are clear and definite, workable；
(3) a kind of sedimentary basin substrate Uranium content and Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, based on right
The substrate Uranium content of Central Asian Mobile Belt (section within Chinese territory) interior 9 typical basin edge erosion source region grinds
Conclude out on the basis of studying carefully achievement and contrasting with known Uranium-productive basin substrate Uranium content feature, contain
Capping is wide, effectiveness is high, the suitability is strong, accuracy is good.
Accompanying drawing explanation
A kind of sedimentary basin substrate Uranium content that Fig. 1 provides for the present invention and uranium minerogenic potentiality
The flow chart of evaluation methodology；
Fig. 2 is Junggar Basin uranium content high level, higher value district distribution schematic diagram.
In figure: the shallow metamorphic clastic rocks of 1-upper palaeozoic, carbonate rock folder volcanic rock, pyroclastic rock；2-
Upper palaeozoic mafic-intermediate volcanic rocks, pyroclastic rock are main folder clastic rock, carbonate rock；In the 3-Paleozoic group
Mafic-acid volcanic rock, pyroclastic rock folder shallow metamorphic clastic rocks, carbonate rock；4-Precambrian crystalline
Basement Metamorphic Rock Series；5-neutrality-middle acidity, alkaline intrusive rocks；6-neutrality intrusive rock；7-basic intrusive rock；
8-Ultrabasic intrusive rock；The higher value of 9-uranium content (district) carries；10-uranium content high level (district) carries；11-navigates
Coverage of survey area.
Detailed description of the invention
A kind of sedimentary basin substrate Uranium content with embodiment, the present invention provided below in conjunction with the accompanying drawings and sandstone
Type Uranium Deposits Assessment Method on Potential is described in detail.
Step S1: use high accuracy GR-800D Airborne gamma energy spectrum Integrated Measurement System to work basin
Peripheral foot erosion source region carries out rock and ore radiometry.
Step S2: gather Acid-intermediate igneous rock rock sample in aeroradiometric survey working area, and to sample
Product carry out 80 mesh and the pollution-free pulverizing of 200 purposes, and after taking pulverizing respectively, sample 80 mesh weight is more than 10g
With 200 mesh weight more than 50g.
Such as, system acquisition basin, aeroradiometric survey working area periphery lose source region substrate different times,
The Acid-intermediate igneous rock rock sample of different lithology, sample requirement is fresh without alteration, weighs about 200-300g.
Step S3: carry out ferrous oxide measurement calmly to being crushed to the 200 pollution-free powder of purpose in step S2
Measure with major and minor component and determine；
Such as, AB-104L and PW2404X ray fluorescence spectrometer is used to carry out unit in 200 mesh powder
Cellulose content complete analysis is tested.
Step S4: carry out mobile uranium share mensuration to being crushed to the 80 pollution-free powder of purpose in step S2；
Such as, the sample being crushed to 80 mesh is first carried out total rock uranium determination, then it is modern to simulate working area
The chemical environment of water of subsoil water, unified use NaHCO3It is configured to the alkalescence HCO of pH=83Aqueous solution
For leaching agent；Sample and leaching agent ratio i.e. solid-to-liquid ratio are 1:10, soak 30 under 20 DEG C of room temperature conditions
My god, every day stirs 1-2 time, and respectively takes immersion in 7 days, 15 days and 30 days and once carry out uranium determination
Analyze.Wherein total rock uranium content, 7 days, 15 days and the 30 days mensuration to uranium content all use instrument
Agilent7500a ICP-MS, it is 50% with humidity that temperature is 20 DEG C.
Step S5: analyzing and processing step S3 and the uranium (U) of S4 acquisition, thorium (Th) content, thorium uranium
Ratio (Ru) and mobile uranium leaching rate.
Such as, list statistics rock mass (stratum) title, numbering, lithology, total rock uranium thorium content (UT、
ThT), calculate uranium, thorium ratio (RU) and mobile uranium leaching rate (AU%)；Wherein, rock mass is entitled
Common name, sample number into spectrum is rock mass title English acronym；Thorium, uranium ratio leach with mobile uranium
Rate computing formula such as formula 1, formula 2
RU=ThT/UTFormula 1
Ru rock sample thorium and the ratio of uranium；
UTTotal uranium content (unit × 10 in certain rock sample powder-6)；
ThTTotal thorium content (unit × 10 in certain rock sample powder-6)。
AUn%=(Un/UT) % formula 2
AUnMobile uranium leaching rate in the n-th day time of %；
UnUranium content (unit × 10 in immersion when stirring n days-6)；
UTThe surveyed uranium content of whole-rock sample powder (unit × 10-6)；
N mixing time, n=7,15,30.
Step S6: integrating step S1 and step S4 data result analyze basement rock Uranium content feature, comment
Valency Formation of Sandstone-type Uranium Deposits potentiality.
Concrete optional following determination methods:
1. as aeroradiometric survey geologic element uranium content (Uar) more than 2.5 × 10-6, thorium content (Thar)
More than 8.5 × 10-6, potassium content (Kar) more than 2.7 × 10-6, for radioactivity Spring layer；Rock dust
UT>5×10-6, RU> 5 and AUn% > 10%, uranium content is high, and thorium, uranium separate notable, and mobile uranium part
Volume is high, is defined as I level uranium source body (layer), and metallogenic prospect of sandstone-type uranium deposit is excellent；
2. when aeroradiometric survey geologic element 2.5 × 10-6>Uar>2.0×10-6,
8.5×10-6>Thar>5×10-6, 2.7 × 10-6Kar>2.0×10-6, for the inclined Spring layer of radioactivity；Work as rock dust
5×10-6>UT>3×10-6, 5 > RU> 3 and 10% > AUn% > 1%, uranium content is higher, and thorium, uranium separate bright
Aobvious, it is defined as II level uranium source body (layer), metallogenic prospect of sandstone-type uranium deposit is good；
3. as aeroradiometric survey geologic element Uar＜ 2.0 × 10-6, Thar＜ 5 × 10-6, Kar＜
2.0×10-6, for radioactivity low value district；As rock dust UT<3×10-6, RU< 3 and AUn% < 1%, uranium
Content is low, and thorium, uranium separation degree are low, is defined as III level uranium source body (layer), before Formation of Sandstone-type Uranium Deposits
Scape is poor.
Below with application in Kelameili Area, eastern Junggar Basin of the evaluation methodology of the present invention for implementing
Example further illustrates the technology bill of the present invention:
Step S1: use high accuracy GR-800D Airborne gamma energy spectrum Integrated Measurement System, to Zhunger Basin
Basin Eastern Kelameili area (workspace area: 89 ° of 00 ' E～90 ° of 45 ' E, 44 ° of 70 ' E～45 ° of 20 ' N)
Carry out rock (ore deposit) stone radiometry.
Step S2: at Kelameili Area, eastern Junggar Basin system acquisition different lithology or stratigraphic unit
Acid-intermediate igneous rock sample, it is desirable to sample is fresh without alteration, and the sample of same geologic element is at least adopted
Collect 5 pieces.
Step S3: the rock sample gathered send professional institution carry out attrition grinding to 200 mesh and 80
200 mesh powder samples are used AB-104L and PW2404X ray fluorescence spectrometer to carry out element by mesh
Content complete analysis is tested.Meanwhile, 80 mesh powder samples are used NaHCO3It is configured to the weak base of pH=8
Property HCO3 -Aqueous solution, sample and leaching agent ratio i.e. solid-to-liquid ratio are 1:10, under the conditions of room temperature 20 DEG C
Soak, measure mobile uranium leaching rate.Leaching cycle is 30 days, and every day stirs 1-2 time, and in 7 days,
Within 15 days and 30 days, respectively take immersion and once carry out uranium content analysis.Wherein total rock uranium content, 7 days, 15 days
Instrument Agilent7500a ICP-MS is all used, in temperature 20 DEG C, humidity with the mensuration of 30 days uranium contents
It is to record under conditions of 50%.
Step S4: list statistics Kelameili area each rock mass (stratum) title, numbering, lithology, complete
Rock uranium thorium content (UT、ThT), calculate uranium, thorium ratio (RU) and mobile uranium leaching rate (AU%),
Statistical result is as shown in table 1.
The eastern quasi-carat main rock mass of beauty rock zone of table 1, stratum uranium thorium content and mobile uranium leaching rate tables of data
Step S5: measure and result of calculation according to step S1 and S4, evaluate Junggar Basin carat beautiful
Area erosion source region substrate uranium source, concrete evaluation result is as follows:
Step S5.1: the aeroradiometric survey of step S1 have identified Ka Mu in carat beauty substrate erosion source region
This special thayer Ye Shike uranium content higher value band, as shown in Figure 2.
This band is positioned on Ka Musite rock mass and the peripheral contacts band thereof of Kalamely Mountain, in NW trending banding
Spread, is about 80km, wide about 9km.Predominantly Hercynian period intrusive body and the devonian period, the Carboniferous Period of exposure
Stratum.The general potassium of this band, thorium content are (2.4-2.6) %, (7.5-8.5) × 10-6Higher value, and
In higher value, discontinuously it is dispersed with potassium, thorium content for (2.7-3.0) %, (8.5-11) × 10-6High level
Sheet, partial points thorium content is up to 13 × 10-6.At this, in band, uranium content is generally (2.0-2.4) × 10-6The back of the body
Scape value, and the scattered uranium content that is dispersed with is (2.4-2.6) × 10 in background value-6High level point.This band potassium,
The higher value of uranium thorium content, high level mainly by the Hercynian granite body of exposure and the outer contacting band Devonian system thereof,
Permian System potassium, uranium thorium content are higher to be caused.
In general, the Devonian system, the Carboniferous System, the Permian System and the sea of this area's basement rock exposure district distribution
Western phase granite uranium content is higher, and uranium element is more active, has Migration And Concentration phenomenon, Local topography shape
Become airborne radioactive anomaly, High-Field or uranium mineralization point, be uranium active layer (body) important in basin.
Step S5.2: according to step S4 statistical computation result, Kelameili area crow spring rock mass, Beile
Cook rock mass uranium content is between 3 × 10-6～5 × 10-6, RU(Th/U) generally higher than 5, mobile uranium leaching rate is big
In 2 or close to 2, II level uranium source body can be belonged to；Barre Ba Duoyi rock mass and (C1)Culm Nanming water group
Average uranium content is less than 3 × 10-6, mobile uranium leaching rate is less than 2, and average Ru is less than 5, it is provided that the energy of uranium
Power is weaker than above-mentioned two rock mass.
In sum, Kelameili area folded basement erosion source region has II level uranium source body (layer) spread, tool
Having certain confession uranium ability, Formation of Sandstone-type Uranium Deposits distant view is good, is the most found that grand celebration in this area
Ditch uranium deposit.
The present invention is applicable to northern China multiple sedimentary basin Formation of Sandstone-type Uranium Deposits district.The invention is not restricted to
Above-mentioned case study on implementation, in the ken that those skilled in the art is possessed, can be without departing from this
Additive method is proposed on the premise of bright objective.
Claims (7)
1. sedimentary basin substrate Uranium content and a Formation of Sandstone-type Uranium Deposits Assessment Method on Potential, its feature exists
In: the method comprises the steps:
Step S1: substrate erosion source region Airborne gamma energy spectrum composite measurement；
Step S2: gather Acid-intermediate igneous rock rock sample in aeroradiometric survey working area, and to sample
Product carry out 80 mesh and the pulverizing of 200 mesh.
Step S3: the powder being crushed to 200 mesh in step S2 is carried out ferrous oxide and measures fixed and element
Content complete analysis measures；
Step S4: the powder being crushed to 80 mesh in step S2 is carried out mobile uranium share mensuration；
Step S5: uranium thorium content, TURA value Ru and the work that analysis and arrangement step S3 obtains with S4
Property Uranium extraction rate AUn%.
Step S6: integrating step S1 and step S4 data result analyze basement rock Uranium content feature, comment
Valency Formation of Sandstone-type Uranium Deposits potentiality.
A kind of sedimentary basin substrate Uranium content the most according to claim 1 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: described step S1 use GR-800D Airborne gamma energy spectrum comprehensive
Measurement system carries out rock and ore radiometry to work basin peripheral foot erosion source region.
A kind of sedimentary basin substrate Uranium content the most according to claim 2 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: in described step S2, in aeroradiometric survey working area, system is adopted
Collection basin periphery erosion source region substrate different times, the Acid-intermediate igneous rock rock sample of different lithology.
A kind of sedimentary basin substrate Uranium content the most according to claim 3 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: in described step S3, to 200 mesh powder use AB-104L and
PW2404X ray fluorescence spectrometer carries out constituent content complete analysis mensuration.
A kind of sedimentary basin substrate Uranium content the most according to claim 4 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: described step S4 specifically includes following steps: to being crushed to 80 mesh
Sample first carry out total rock uranium determination, then simulate the chemical environment of water of working area modern times subsoil water, make
Soak with leaching agent, and take immersion and once carry out uranium content analysis
A kind of sedimentary basin substrate Uranium content the most according to claim 5 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: described step S5 is added up rock mass (stratum) title, numbering, rock
Property, total rock uranium thorium content, calculate uranium, thorium ratio RUAnd mobile uranium leaching rate AU%.
A kind of sedimentary basin substrate Uranium content the most according to claim 6 is dived with Formation of Sandstone-type Uranium Deposits
Power evaluation methodology, it is characterised in that: described thorium, uranium ratio RUAnd mobile uranium leaching rate AUn% calculates
Formula such as formula (1) shown in (2):
RU=ThT/UT (1)
AUn%=(Un/UT) % (2)
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