CN106324700A - Sedimentary basin red strata sandstone type uranium mine metallogenic mode construction method - Google Patents
Sedimentary basin red strata sandstone type uranium mine metallogenic mode construction method Download PDFInfo
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Abstract
The invention belongs to the technical field of uranium exploration and particularly relates to a sedimentary basin red strata sandstone type uranium mine metallogenic mode construction method which reveals the control effect of each geological effect on uranium mineralization. The method comprises the steps of (1) collecting and surveying data, (2) carrying out field geological survey, (3) carrying out sample processing, rock-mineral determination and geochemical analysis, (4) processing test data and analyzing and judging a result, and (5) constructing a metallogenic mode. According to the method, the geological factors of strata, structure, metallogenic fluid, ore material source are integrated, a red strata sandstone type uranium mine metallogenic mode can be effectively constructed, a red strata sandstone type uranium mine prospecting target area is effectively predicted, the control effect of the uranium mineralization by each geological effect is revealed, and the sandstone type uranium mine prospecting space is enlarged.
Description
Technical field
The invention belongs to uranium exploration technical field, be specifically related to sandstone-type uranium in a kind of sedimentary basin red beds
Ore deposit ore_forming model construction method.
Background technology
The primary stratum for red beds refers under arid climatic conditions the stratum of deposition, stratum color present yellow,
The oxidation tints such as redness, brown, lack organic matter, F3+/Fe2+ > 1.
In sandstone-type uranium mineralization with respect research with exploration, red beds is typically not as looking for ore deposit target zone, therefore in red beds
The research of Metallogenic Model of Sandstone-type Uranium Deposits is few.Red beds is widely distributed in sedimentary basin, on certain ground
Under the conditions of matter, red beds can form the sandrock-type uranium deposit with industrial value, it is therefore necessary to set up
The construction method of Metallogenic Model of Sandstone-type Uranium Deposits in a kind of red beds, thus expand Prospecting Sandstone-type Uranium Deposits space.
Summary of the invention
The technical problem to be solved is, not enough for prior art, it is provided that a kind of the most comprehensive
The geologic(al) factors such as stratum, structure, BIFhosted gold deposit, disclose each geologic process to the control action of U metallogeny
Formation of Sandstone-type Uranium Deposits mode construction method in sedimentary basin red beds.
The technical solution adopted in the present invention is:
A kind of Formation of Sandstone-type Uranium Deposits mode construction method in sedimentary basin red beds, comprises the following steps:
Step one, collection, survey data；
Step 2, carries out Field Geology Investigations；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data process, analyze and judged result；
Step 5, builds ore_forming model；
In described step one, collect investigation data include regional geologic map, mine geology figure, remote sensing figure,
Geophysical-chemical map；Survey area geologic setting, structural evolution, Basin Evolution, sedimentary evolution background.
Field geology carries out profile survey by described step 2, Cheng Kuang area observed and recorded formation lithology,
Stratum color, stratum whether containing carbon dust, attitude of stratum, formation thickness, structure occurrence, alteration type,
Mineralization Features, statistically layer thickness, set up earth formation, statistics mineralising and the position relationship of structure, erosion
Become the position relationship with structure, tentatively judge the ore control factor of sandstone-type uranium mineralization with respect in red beds, collection mineralising sand
Rock, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample；Described select monomineralic sample of sandstone
No less than 1kg.
Described step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
The 3.1 fluid inclusion sheets that sample of sandstone is switched to the light thin slice of about 0.3mm, about 0.5mm,
Identify material composition and the alteration features of sandstone under an optical microscope, use JXA-8100 electron probe to divide
Analyzer analyzes chemical constituent and the existence form of uranium of uranium mineral；Utilize Linkam THMSG600 cold and hot
Platform measures inclusion enclave temperature, and its temperature-measuring range is-196 DEG C～600 DEG C, uses LABHR-VIS LabRAM
HR800 type Laser-Raman microspectroscopy records inclusion gas phase constituent；
3.2 by 15g sandstone block sample, 15g mud stone block sample, uses TESCAN VEGA II type scanning electron
Microscope Qualitative Identification material composition, then block sample is crushed to 300 mesh, make according to SY/T 5163-2010
By D8 DISCOVER type X-ray diffractometer quantitative analysis material component；
Sandstone, mudstone sample are crushed to 200 mesh by 3.3, no less than 50g, and use its powder
AB-104L, PW2404 Xray fluorescence spectrometer measures Main elements, use ELEMENT etc. from
Daughter mass spectrometer measures trace element；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende thing and carbonate cements.Make
With ISOPROBE-T instrument, pitch blende is carried out U-Pb isotope tracling method, use MAT253 to measure
Pitch blende O isotope；Use MAT 253 instrument that carbonate carries out C O isotope assay.
Described step 4 test data process, analysis also judged result comprises the following steps:
4.1 judge material group according to optical microphotograph lens-belowed identifying, scanning electron microscope qualification, X diffraction analysis data
Point, alteration features；
Described material composition, emphasis determines whether the acid volcanics that can provide uranium；
Described alteration features, emphasis judges the choritization close with relationship to uranium ore formation, carbonation, boiling
Petrochemical industry, volcanic glass devitrification etc.；
4.2 according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C O together
Position element value, mineralising sandstone rare earth element characteristic judge fluid inclusion natures and source；
Due to isotope fractionation effect, the C-O isotope value of carbonate cements can not directly reflect into ore deposit
The C-O isotope value of fluid, needs to correct according to calcite fluid C-O isotopic equilibrium Fractionation Equations.
Calcite fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation is:
δ in equation 113CPDB-fluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB-calciteFor carbonate glue
The C isotope value of knot thing.
In equation 2 and equation 1It is scaled into for carbonate cements C isotope value
The correction value of C isotope value in the fluid of ore deposit.
A=-8.914 in equation 2, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature
+273.15。
Calcite fluid equilibrium oxygen isotope Fractionation Equations is:
δ in equation 318OSMOW-fluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW-calciteFor carbonic acid
The O isotope value of salt cement.
In equation 3 and equation 4It is scaled into for carbonate cements O isotope value
The correction value of O isotope value in the fluid of ore deposit.
A=-8.914 in equation 4, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature
+273.15；
BIFhosted gold deposit C-O isotope value after correcting is thrown into δ13CPDB—δ18OSMOWIn figure, it is judged that
BIFhosted gold deposit is originated；
The partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material
Matter, Eu is most sensitive to fluid inclusion natures for its rare earth elements, and δ Eu is that rare earth element is fallen from the sky or outer space by spherolite
A parameter of Eu feature is reacted after stone standardization；As δ Eu > 1, represent Eu normal anomaly, then have from
The high-temperature reductibility fluid in deep adds BIFhosted gold deposit；As δ Eu < 1, represent Eu negative anomaly, then it represents that
Not from the high-temperature reductibility fluid in deep in BIFhosted gold deposit, reductive fluid may be from ledge it
Oil gas in lower stratum or coal bed gas etc.；
4.3 according under pitch blende O isotope, mirror, scanning electron microscope, X diffraction identify material composition,
Alteration features judges the source of uranium.
Due to the isotopic fractionation of O, pitch blende O isotope can not be in direct reaction BIFhosted gold deposit
The isotope of O, needs to correct according to pitch blende fluid O isotopic equilibrium Fractionation Equations.
Pitch blende fluid O isotopic equilibrium Fractionation Equations is:
Fluid δ in equation 518OV-SMOWFor the same place value of O in BIFhosted gold deposit；
Pitch blende δ18OV-SMOWFor O isotope value in pitch blende thing；
In equation 5 and equation 6It is scaled into ore deposit stream for pitch blende thing O isotope value
The correction value of body O isotope value；
A=3.63 in equation 6, B=-13.29, C=4.42, T=Fluid inclusions temperature
+ 273.15=368.15K；
O isotope value in BIFhosted gold deposit after rectification and magmatic water O isotope value, atmospheric water oxygen coordination
Value compares, and can determine whether the source of uranium in BIFhosted gold deposit；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value scope, then becoming ore deposit
In fluid, uranium is from deep；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value scope, then BIFhosted gold deposit
Middle uranium is from atmospheric water effect；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value and atmospheric water O is same
The blend range of position element value, then have the uranium that atmospheric water effect brings, however not excluded that have in explanation BIFhosted gold deposit
From the uranium in deep, more comprehensive alteration features etc. judges the source that uranium is most possible.
Formation thickness, earth formation, structure structure occurrence and distribution, the ore deposit of statistics surveyed according to step 2
Position relationship, alteration and the position relationship of structure, mineralising and the relation of lithology, the mineralising changed and construct are empty
Between distribution characteristics, the ore control factor of sandstone-type uranium mineralization with respect in the red beds of extraction, utilize Coreldraw draw soft
Part sketches out the spatial distribution of stratum, structure, mineralising, alteration, the analysis result of integrating step four, incites somebody to action
In red beds, the uranium mineralization process of sandstone-type uranium mineralization with respect passes through Coreldraw Software on Drawing ore_forming model figure.
The invention has the beneficial effects as follows:
The set the most of the present invention geologic(al) factors such as stratum, structure, BIFhosted gold deposit, ore-forming material, energy
Prospecting Sandstone-type Uranium Deposits target in sandrock-type Uranium metallogenetic model, effectively prediction red beds in enough red beds of structure effectively
District；
2. disclose each geologic process control action to U metallogeny；
3. expand Prospecting Sandstone-type Uranium Deposits space.
Accompanying drawing explanation
Fig. 1 is Formation of Sandstone-type Uranium Deposits mode construction method flow diagram in sedimentary basin red beds；
Fig. 2 is formation of sandstone-type uranium deposits ideograph；
Detailed description of the invention
Metallogenic Model of Sandstone-type Uranium Deposits in a kind of sedimentary basin the red beds below in conjunction with the accompanying drawings present invention provided
Construction method is introduced:
A kind of Formation of Sandstone-type Uranium Deposits mode construction method in sedimentary basin red beds:
Step one, collection, survey data；
Step 2, carries out Field Geology Investigations；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data process, analyze and judged result；
Step 5, builds ore_forming model；
In described step one, collect investigation data include regional geologic map, mine geology figure, remote sensing figure,
Geophysical-chemical map；Survey area geologic setting, structural evolution, Basin Evolution, sedimentary evolution background.
Field geology carries out profile survey by described step 2, Cheng Kuang area observed and recorded formation lithology,
Stratum color, stratum whether containing carbon dust, attitude of stratum, formation thickness, structure occurrence, alteration type,
Mineralization Features, statistically layer thickness, set up earth formation, statistics mineralising and the position relationship of structure, erosion
Become the position relationship with structure, tentatively judge the ore control factor of sandstone-type uranium mineralization with respect in red beds, collection mineralising sand
Rock, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample；Described select monomineralic sample of sandstone
No less than 1kg.
Described step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
The 3.1 fluid inclusion sheets that sample of sandstone is switched to the light thin slice of about 0.3mm, about 0.5mm,
Identify material composition and the alteration features of sandstone under an optical microscope, use JXA-8100 electron probe to divide
Analyzer analyzes chemical constituent and the existence form of uranium of uranium mineral；Utilize Linkam THMSG600 cold and hot
Platform measures inclusion enclave temperature, and its temperature-measuring range is-196 DEG C～600 DEG C, uses LABHR-VIS LabRAM
HR800 type Laser-Raman microspectroscopy records inclusion gas phase constituent；
3.2 by 15g sandstone block sample, 15g mud stone block sample, uses TESCAN VEGA II type scanning electron
Microscope Qualitative Identification material composition, then block sample is crushed to 300 mesh, make according to SY/T 5163-2010
By D8 DISCOVER type X-ray diffractometer quantitative analysis material component；
Sandstone, mudstone sample are crushed to 200 mesh by 3.3, no less than 50g, and use its powder
AB-104L, PW2404 Xray fluorescence spectrometer measures Main elements, use ELEMENT etc. from
Daughter mass spectrometer measures trace element；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende thing and carbonate cements.Make
With ISOPROBE-T instrument, pitch blende is carried out U-Pb isotope tracling method, use MAT253 to measure
Pitch blende O isotope；Use MAT 253 instrument that carbonate carries out C O isotope assay.
Described step 4 test data process, analysis also judged result comprises the following steps:
4.1 judge material group according to optical microphotograph lens-belowed identifying, scanning electron microscope qualification, X diffraction analysis data
Point, alteration features；
Described material composition, emphasis determines whether the acid volcanics that can provide uranium；
Described alteration features, emphasis judges the choritization close with relationship to uranium ore formation, carbonation, boiling
Petrochemical industry, volcanic glass devitrification etc.；
4.2 according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C O together
Position element value, mineralising sandstone rare earth element characteristic judge fluid inclusion natures and source；
Due to isotope fractionation effect, the C-O isotope value of carbonate cements can not directly reflect into ore deposit
The C-O isotope value of fluid, needs to correct according to calcite fluid C-O isotopic equilibrium Fractionation Equations.
Calcite fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation is:
δ in equation 113CPDB-fluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB-calciteFor carbonate glue
The C isotope value of knot thing.
In equation 2 and equation 1It is scaled into for carbonate cements C isotope value
The correction value of C isotope value in the fluid of ore deposit.
A=-8.914 in equation 2, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature
+273.15。
Calcite fluid equilibrium oxygen isotope Fractionation Equations is:
δ in equation 318OSMOW-fluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW-calciteFor carbonic acid
The O isotope value of salt cement.
In equation 3 and equation 4It is scaled into for carbonate cements O isotope value
The correction value of O isotope value in the fluid of ore deposit.
A=-8.914 in equation 4, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature
+273.15；
BIFhosted gold deposit C-O isotope value after correcting is thrown into δ13CPDB—δ18OSMOWIn figure, it is judged that
BIFhosted gold deposit is originated；
The partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material
Matter, Eu is most sensitive to fluid inclusion natures for its rare earth elements, and δ Eu is that rare earth element is fallen from the sky or outer space by spherolite
A parameter of Eu feature is reacted after stone standardization；As δ Eu > 1, represent Eu normal anomaly, then have from
The high-temperature reductibility fluid in deep adds BIFhosted gold deposit；As δ Eu < 1, represent Eu negative anomaly, then it represents that
Not from the high-temperature reductibility fluid in deep in BIFhosted gold deposit, reductive fluid may be from ledge it
Oil gas in lower stratum or coal bed gas etc.；
4.3 according under pitch blende O isotope, mirror, scanning electron microscope, X diffraction identify material composition,
Alteration features judges the source of uranium.
Due to the isotopic fractionation of O, pitch blende O isotope can not be in direct reaction BIFhosted gold deposit
The isotope of O, needs to correct according to pitch blende fluid O isotopic equilibrium Fractionation Equations.
Pitch blende fluid O isotopic equilibrium Fractionation Equations is:
Fluid δ in equation 518OV-SMOWFor the same place value of O in BIFhosted gold deposit；
Pitch blende δ18OV-SMOWFor O isotope value in pitch blende thing；
In equation 5 and equation 6It is scaled into ore deposit stream for pitch blende thing O isotope value
The correction value of body O isotope value；
A=3.63 in equation 6, B=-13.29, C=4.42, T=Fluid inclusions temperature
+ 273.15=368.15K；
O isotope value in BIFhosted gold deposit after rectification and magmatic water O isotope value, atmospheric water oxygen coordination
Value compares, and can determine whether the source of uranium in BIFhosted gold deposit；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value scope, then becoming ore deposit
In fluid, uranium is from deep；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value scope, then BIFhosted gold deposit
Middle uranium is from atmospheric water effect；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value and atmospheric water O is same
The blend range of position element value, then have the uranium that atmospheric water effect brings, however not excluded that have in explanation BIFhosted gold deposit
From the uranium in deep, more comprehensive alteration features etc. judges the source that uranium is most possible.
Formation thickness, earth formation, structure structure occurrence and distribution, the ore deposit of statistics surveyed according to step 2
Position relationship, alteration and the position relationship of structure, mineralising and the relation of lithology, the mineralising changed and construct are empty
Between distribution characteristics, the ore control factor of sandstone-type uranium mineralization with respect in the red beds of extraction, utilize Coreldraw draw soft
Part sketches out the spatial distribution of stratum, structure, mineralising, alteration, the analysis result of integrating step four, incites somebody to action
In red beds, the uranium mineralization process of sandstone-type uranium mineralization with respect passes through Coreldraw Software on Drawing ore_forming model figure.
Embodiment 1
Step one: collection of data is investigated
Collect 1:10 ten thousand regional geologic map, 1:2000 mine geology figure, 1:10 ten thousand remote sensing figure, enumeration district
Territory geologic setting, such as survey area tectonic setting, Basin Evolution background, working area is by from the Cretaceous period in early days
The impact of the big rift valley in Africa germinated, in the Cretaceous period, working area is generally in tensile state, fracture
It is in extensional state.
Step 2: Field Geology Investigations
(1) Lower Cretaceous Series A Sawua group in A Zelike area is with slight angle unconformity and the Jurassic system that underlies
Unconformity contacts, and integrates with overlying Lower Cretaceous Series Yi Lazeer group and contacts.A Zelike group thickness is
20～40m, sandstone is based on middle coarse grain rock-fragment sandstone, for delta front distributary channel sandstone.Channel sand
Rock A Zelike area in north north east to spread, may recognize that two distributary channels.In A Zelike group
Covering the Yi Lazeer group mud stone of thick about 200m, mud stone presss from both sides the aubergine tufa stone of 5 thickness about 2～5m.Ah
Ze Like group and Yi Lazeer group are maroon stratum.
(2) the main structural grain in A Zelike area be east northeast to, secondary structural grain is NW trending.North
East orientation A Zelike major rupture is regional fault, cuts basin substrate, and this fracture provides deep fluid
The passage risen.NW trending tomography is all grown in the cap rock of basin, tomography scale compared with east northeast to little, mineralising
The most intensive NW trending high angle tension fracture is grown in area.
(3) celadon reduction alteration is grown in mineralising area in A Zelike area, and celadon reduction alteration is controlled
In NW trending tomography, celadon reduction alteration is distributed along NW trending tomography.Mineralising is all grown in celadon also
In former altered fracture zone, it is all covered with several tens cm on mineralising sandstone grayish green to the Yi Lazeer group that 2m is thick
Chromatic rendition alteration mud stone.
(4) mineralising is plate-shaped, is positioned within the scope of thickness about 2m～4m of A Sawua group sandstone top.
Mineralising sandstone calcite cementation is strong, sees Cu concentrate grade and uranium mineralization association.
(5) 5, celadon mineralising sandstone, 5, maroon non-mineralising sandstone, celadon mud stone 3 are gathered
Part, 3, maroon mud stone, aubergine mudstone 3.
Extracting A Zelike uranium deposit ore control factor by above-mentioned (1st), (2), (3), (4) is river course
Sand body, northwestward faults, celadon reduction alteration band.
Step 3: sample treatment and rock-mineral determination, chemical analysis
Non-mineralising sandstone, mineralising sandstone make light thin slice, and light thin slice is carried out rock-mineral determination；Mineralising sandstone
Making fluid inclusion sheet, convection cell inclusion enclave carries out thermometric and gas phase composition measures.Non-mineralising sandstone,
Mineralising sandstone, celadon mud stone, maroon mud stone, aubergine tufa stone are scanned Electronic Speculum, X diffraction
Analysis, geochemical analysis.Mineralising sandstone is selected pitch blende thing, carbonate cements, and to drip
Blue or green ore deposit carries out U-Pb isotope tracling method, O is all element mensuration, and carbonate cements is carried out C-O coordination
Element measures.
Tested by rock-mineral determination, scanning electron microscope, X diffraction, A Sawua group mineralising sandstone and non-mineralising
Sandstone is all rich in material from acidic volcanic glass (material from acidic volcanic glass uranium content is high), and analcitization is strong, grows acid
Property volcanic glass devitrification.Yi Lazeer group maroon mud stone, celadon mud stone, aubergine tufa stone are equal
Grow analcitization.
Analcime is that material from acidic volcanic glass is formed with atmospheric water effect under lower temperature, pressure, side's boiling
During petrochemical industry, material from acidic volcanic glass release uranium enters fluid, provides uranium element for U metallogeny.Acid
Volcanic glass devitrification is a kind of spontaneous effect, and the uranium of big ionic radius is during devitrification, it is impossible to
Enter quartz crystal, be discharged into fluid, provide uranium element for U metallogeny.
By lens-belowed identifying and electron probing analysis, uranium mainly with Colophonium mineral, secondly for coffinite existence,
Presented in cement in chip intergranular pore, chip crack and the hole of sandstone.Common uranium with
Copper association.
Fluid-rock system displays temperature scope is 60 DEG C～140 DEG C, is concentrated mainly on 80 DEG C～100 DEG C,
Mean temperature is 95 DEG C.Fluid inclusion gas phase composition is H2、CO2、CH4、N2, wherein H2For by force
Reducing substances, provides reducing agent, H for U metallogeny2From deep, it is impossible to from earth's surface.
Mineralising sandstone rare earth element characteristic is shown as obvious Eu normal anomaly, and instruction has the high temperature from deep
Reductive fluid adds in BIFhosted gold deposit.
The pitch blende U-Pb isotope tracling method display A Zelike uranium deposit picked out in mineralising sandstone becomes
The ore deposit age is 101.3 ± 2.0Ma, for Later Early Cretaceous.
The C-O isotope of mineralising sandstone carbonate cements, is put down by calcite fluid C-O isotope
After weighing apparatus Fractionation Equations is corrected, then throw into δ13CV-PDB—δ18OV-SMOWFigure shows the C in BIFhosted gold deposit
From earth mantle, O, from the mixing of magmatic water Yu atmospheric water, illustrates that BIFhosted gold deposit is earth mantle reductive fluid
Mixing with atmospheric water.
The pitch blende O isotope picked out in mineralising sandstone, by pitch blende fluid O isotope
After HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation is corrected, display BIFhosted gold deposit has obvious atmospheric water effect.In conjunction with the acid of stratum richness
Property volcanic glass, grow analcitization, volcanic glass devitrification, the uranium in A Zelike uranium deposit is described
Own from stratum.
Step 5: build ore_forming model
The ore control factor of earth formation, lithology, structure, Mineralization Features and extraction according to step 2, knot
Close the analysis judged result of step 4, build A Zelike formation of sandstone-type uranium deposits pattern, and use
Coreldraw Software on Drawing ore_forming model (Fig. 2).
I: in the A Sawua period in early days Cretaceous period, A Zelike area deposited maroon with middle xalsonte
Rock is the main A Sawua group rich in material from acidic volcanic glass, then in Yi Laze phase at that time, A Sawua group
On cover the thick maroon mud stone of at least about 200m, mud stone presss from both sides 5 set aubergine tufa stones, mud
Rich in acid volcanic tuff in rock.The permeability that A Sawua group river channel sand tool is good, is i.e. conducive to
BIFhosted gold deposit circulates in sand body, can provide good holding ore space for U metallogeny again.A Sawua group and
Acid volcanics abundant in Yi Lazeer group can provide good uranium source for U metallogeny.
II: at Later Early Cretaceous (101.3Ma), A Zelike area is affected by the big rift valley in Africa,
A Zelike major rupture is extensional state, rises from the reductive fluid of earth mantle along A Zelike major rupture,
Reductive fluid enters the northwestward faults linked up with A Zelike fracture and continues up flowing, when running into thickness
When the Yi Lazeer group mud stone of layer blocks, reductive fluid enters laterally the A Sawua group that permeability is good
Top sand body, defines the reduction space along northwestward faults distribution in the sand body of A Sawua group top.
Owing to analcitization and the volcanic glass of volcanics acid in A Sawua group and Yi Lazeer group take off glass
Changing, uranium element enters atmospheric water fluid, and uranium enters reduction space with fluid, with reductive fluid generation oxygen
Changing reduction reaction, uranium is precipitation enrichment of ore-forming in reduction space.
Claims (6)
1. Formation of Sandstone-type Uranium Deposits mode construction method in a sedimentary basin red beds, it is characterised in that:
Step one, collection, survey data；
Step 2, carries out Field Geology Investigations；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data process, analyze and judged result；
Step 5, builds ore_forming model.
Formation of Sandstone-type Uranium Deposits mode construction method in a kind of sedimentary basin red beds the most according to claim 1, it is characterised in that: in described step one, the data collecting investigation includes regional geologic map, mine geology figure, remote sensing figure, Geophysical-chemical map；Survey area geologic setting, structural evolution, Basin Evolution, sedimentary evolution background.
Formation of Sandstone-type Uranium Deposits mode construction method in a kind of sedimentary basin red beds the most according to claim 1, it is characterized in that: described step 2 carries out profile survey to field geology, Cheng Kuang area observed and recorded formation lithology, stratum color, whether stratum is containing carbon dust, attitude of stratum, formation thickness, structure occurrence, alteration type, Mineralization Features, statistically layer thickness, set up earth formation, statistics mineralising and the position relationship of structure, alteration and the position relationship of structure, tentatively judge the ore control factor of sandstone-type uranium mineralization with respect in red beds, gather mineralising sandstone, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample；Described select monomineralic sample of sandstone no less than 1kg.
Formation of Sandstone-type Uranium Deposits mode construction method in a kind of sedimentary basin red beds the most according to claim 1, it is characterised in that: described step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
The 3.1 fluid inclusion sheets that sample of sandstone is switched to the light thin slice of about 0.3mm, about 0.5mm, identify material composition and the alteration features of sandstone under an optical microscope, use JXA-8100 electron microprobe examination to analyze chemical constituent and the existence form of uranium of uranium mineral；Utilizing cold and hot of Linkam THMSG600 to measure inclusion enclave temperature, its temperature-measuring range is-196 DEG C～600 DEG C, records inclusion gas phase constituent with LABHR-VIS LabRAM HR800 type Laser-Raman microspectroscopy；
3.2 by 15g sandstone block sample, 15g mud stone block sample, use TESCAN VEGA II type scanning electron microscope Qualitative Identification material composition, block sample is crushed to 300 mesh again, uses D8 DISCOVER type X-ray diffractometer quantitative analysis material component according to SY/T 5163-2010；
Sandstone, mudstone sample are crushed to 200 mesh by 3.3, no less than 50g, and use AB-104L, PW2404 Xray fluorescence spectrometer to measure Main elements in its powder, use ELEMENT Plasma Mass Spectrometer to measure trace element；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende thing and carbonate cements.Use ISOPROBE-T instrument that pitch blende carries out U-Pb isotope tracling method, use MAT253 to measure pitch blende O isotope；Use MAT 253 instrument that carbonate carries out C O isotope assay.
Formation of Sandstone-type Uranium Deposits mode construction method in a kind of sedimentary basin red beds the most according to claim 1, it is characterised in that: described step 4 test data process, analysis also judged result comprises the following steps:
4.1 judge material composition, alteration features according to optical microphotograph lens-belowed identifying, scanning electron microscope qualification, X diffraction analysis data；
Described material composition, emphasis determines whether the acid volcanics that can provide uranium；
Described alteration features, emphasis judges the choritization close with relationship to uranium ore formation, carbonation, zeolitization, volcanic glass devitrification etc.；
4.2 judge fluid inclusion natures and source according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C O isotope value, mineralising sandstone rare earth element characteristic；
Due to isotope fractionation effect, the C-O isotope value of carbonate cements can not directly reflect the C-O isotope value of BIFhosted gold deposit, needs to correct according to calcite fluid C-O isotopic equilibrium Fractionation Equations.
Calcite fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation is:
δ in equation 113CPDB- FluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB- CalciteC isotope value for carbonate cements.
In equation 2 and equation 1It is scaled the correction value of C isotope value in BIFhosted gold deposit for carbonate cements C isotope value.
A=-8.914 in equation 2, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature+273.15.
Calcite fluid equilibrium oxygen isotope Fractionation Equations is:
δ in equation 318OSMOW- FluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW- CalciteO isotope value for carbonate cements.
In equation 3 and equation 4It is scaled the correction value of O isotope value in BIFhosted gold deposit for carbonate cements O isotope value.
A=-8.914 in equation 4, B=8.557, C=-18.11, D=8.27, T=Fluid inclusions temperature+273.15；
BIFhosted gold deposit C-O isotope value after correcting is thrown into δ13CPDB—δ18OSMOWIn figure, it is judged that BIFhosted gold deposit is originated；
The partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material character, and Eu is most sensitive to fluid inclusion natures for its rare earth elements, and δ Eu is that rare earth element is reacted a parameter of Eu feature after chondrite normalized；As δ Eu > 1, represent Eu normal anomaly, then have the high-temperature reductibility fluid from deep to add BIFhosted gold deposit；As δ Eu < 1, represent Eu negative anomaly, then it represents that not from the high-temperature reductibility fluid in deep in BIFhosted gold deposit, oil gas that reductive fluid may be under ledge in stratum or coal bed gas etc.；
4.3 according under pitch blende O isotope, mirror, the material composition identified of scanning electron microscope, X diffraction, alteration features judge the source of uranium.
Due to the isotopic fractionation of O, pitch blende O isotope can not the isotope of O in direct reaction BIFhosted gold deposit, need to correct according to pitch blende fluid O isotopic equilibrium Fractionation Equations.
Pitch blende fluid O isotopic equilibrium Fractionation Equations is:
Fluid δ in equation 518OV-SMOWFor the same place value of O in BIFhosted gold deposit；
Pitch blende δ18OV-SMOWFor O isotope value in pitch blende thing；
In equation 5 and equation 6The correction value of BIFhosted gold deposit O isotope value it is scaled for pitch blende thing O isotope value；
A=3.63 in equation 6, B=-13.29, C=4.42, T=Fluid inclusions temperature+273.15=368.15K；
O isotope value in BIFhosted gold deposit after rectification compares with place value with magmatic water O isotope value, atmospheric water oxygen, can determine whether the source of uranium in BIFhosted gold deposit；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value scope, then in BIFhosted gold deposit uranium from deep；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value scope, then in BIFhosted gold deposit uranium from atmospheric water effect；
If if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value and the blend range of atmospheric water O isotope value, explanation BIFhosted gold deposit then has the uranium that atmospheric water effect brings, it is not excluded for the uranium from deep, more comprehensive alteration features etc. judges the source that uranium is most possible.
Formation of Sandstone-type Uranium Deposits mode construction method in a kind of sedimentary basin red beds the most according to claim 1, it is characterized in that: the formation thickness surveyed according to step 2, earth formation, structure structure occurrence and distribution, the mineralising of statistics and the position relationship of structure, alteration and the position relationship of structure, mineralising and the relation of lithology, mineralization space distribution feature, the ore control factor of sandstone-type uranium mineralization with respect in the red beds extracted, Coreldraw drawing software is utilized to sketch out stratum, structure, mineralising, the spatial distribution of alteration, the analysis result of integrating step four, by the uranium mineralization process of sandstone-type uranium mineralization with respect in red beds by Coreldraw Software on Drawing ore_forming model figure.
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