CN106324700B - Metallogenic Model of Sandstone-type Uranium Deposits construction method in sedimentary basin red beds - Google Patents
Metallogenic Model of Sandstone-type Uranium Deposits construction method in sedimentary basin red beds Download PDFInfo
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Abstract
The invention belongs to uranium exploration technical fields, and in particular to the geologic(al) factors such as a kind of abundant comprehensive stratum, construction, BIFhosted gold deposit disclose each geologic process to Metallogenic Model of Sandstone-type Uranium Deposits construction method in the sedimentary basin red beds of the control action of U metallogeny；The following steps are included: step 1, is collected, survey data；Step 2 carries out Field Geology Investigations；Step 3, sample treatment, rock-mineral determination and geochemical analysis；Step 4, test data processing, analysis and judging result；Step 5 constructs ore_forming model；The geologic(al) factors such as set of the present invention stratum, construction, BIFhosted gold deposit, ore-forming material, can be effectively constructed sandstone-type uranium deposit mode in red beds, Prospecting Sandstone-type Uranium Deposits target area in red beds is effectively predicted；Each geologic process is disclosed to the control action of U metallogeny；Expand Prospecting Sandstone-type Uranium Deposits space.
Description
Technical field
The invention belongs to uranium exploration technical fields, and in particular to Formation of Sandstone-type Uranium Deposits mould in a kind of sedimentary basin red beds
Formula construction method.
Background technique
The primary stratum for red beds refers to the stratum deposited under arid climatic conditions, and yellow, red, brown is presented in stratum color
Etc. oxidation tints, lack organic matter, F3+/Fe2+ > 1.
It studies and explores in sandstone-type uranium mineralization with respect, red beds is generally not as looking for mine target zone, therefore sandstone-type uranium in red beds
The research of mine ore_forming model is few.Red beds is widely distributed in sedimentary basin, being capable of shape in red beds under certain geological conditions
At the sandrock-type uranium deposit with industrial value, it is therefore necessary to establish a kind of building of Metallogenic Model of Sandstone-type Uranium Deposits in red beds
Method, to expand Prospecting Sandstone-type Uranium Deposits space.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of abundant comprehensive stratum, structure
It makes, the geologic(al) factors such as BIFhosted gold deposit, discloses each geologic process to sandrock-type in the sedimentary basin red beds of the control action of U metallogeny
Uranium Deposits mode construction method.
The technical scheme adopted by the invention is that:
Metallogenic Model of Sandstone-type Uranium Deposits construction method in a kind of sedimentary basin red beds, comprising the following steps:
Step 1 is collected, survey data；
Step 2 carries out Field Geology Investigations；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data processing, analysis and judging result；
Step 5 constructs ore_forming model；
In the step 1, the data for collecting investigation includes regional geologic map, mine geology figure, remote sensing figure, Geophysical-chemical figure
Part；Survey area geologic setting, structural evolution, Basin Evolution, sedimentary evolution background.
In the step 2 to field geology carry out profile survey, at mine area observe and record formation lithology, stratum color,
Whether stratum contains carbon dust, attitude of stratum, formation thickness, construction occurrence, alteration type, Mineralization Features, counts formation thickness, establishes
Earth formation counts the positional relationship of mineralising and construction, the positional relationship of alteration and construction, tentatively judges sandstone-type uranium in red beds
Ore control factor, acquisition the mineralising sandstone, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample of mine；It is described select it is monomineralic
Sample of sandstone is no less than 1kg.
The step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
3.1 are switched to sample of sandstone the fluid inclusion piece of the light thin slice of 0.3mm or so, 0.5mm or so, in optical microphotograph
The material composition and alteration features of lens-belowed identifying sandstone use the chemical group of JXA-8100 electron microprobe examination analysis uranium mineral
Divide the existence form with uranium；Temperature is wrapped up using cold and hot measurement of Linkam THMSG600, temperature-measuring range is -196 DEG C~
600 DEG C, inclusion gas phase constituent is measured with LABHR-VIS LabRAM HR800 type Laser-Raman microspectroscopy；
3.2, by 15g sandstone block sample, 15g mud stone block sample, use the II qualitative mirror of type scanning electron microscope of TESCAN VEGA
Determine material composition, then block sample is crushed to 300 mesh, uses D8 DISCOVER type X-ray diffractometer according to SY/T 5163-2010
Quantitative analysis substance component；
Sandstone, mudstone sample are crushed to 200 mesh, no less than 50g by 3.3, and use AB-104L, PW2404 to its powder
Xray fluorescence spectrometer measures Main elements, measures microelement using ELEMENT Plasma Mass Spectrometer；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende object and carbonate cements.It uses
ISOPROBE-T instrument carries out U-Pb isotope tracling method to pitch blende, measures pitch blende O isotope using MAT253；It uses
253 instrument of MAT carries out C-O isotope assay to carbonate.
Step 4 test data processing, analysis and judging result the following steps are included:
4.1 judge that material composition, alteration are special according to optical microphotograph lens-belowed identifying, scanning electron microscope identification, X diffraction analysis data
Sign；
The material composition, emphasis determine whether the acid volcanics that can provide uranium；
The alteration features, emphasis judgement and the close choritization of relationship to uranium ore formation, carbonation, zeolitization, volcano
Glass devitrification etc.；
4.2 according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C-O isotope value, mine
Change sandstone rare earth element characteristic and judges fluid inclusion natures and source；
Since isotope fractionation acts on, the C-O isotope value of carbonate cements cannot directly reflect the C-O of BIFhosted gold deposit
Isotope value is needed according to calcite-fluid C-O isotopic equilibrium Fractionation Equations correction.
Calcite-fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation are as follows:
δ in equation 113CPDB- fluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB- calciteFor the same position C of carbonate cements
Element value.
In equation 2 and equation 1C in BIFhosted gold deposit is scaled for carbonate cements C isotope value
The correction value of 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 are as follows:
δ in equation 318OSMOW- fluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW- calciteIt is same for the O of carbonate cements
Position element value.
In equation 3 and equation 4O in BIFhosted gold deposit is scaled for carbonate cements O isotope value
The correction value of 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 correction is thrown into δ13CPDB—δ18OSMOWIn figure, BIFhosted gold deposit source is judged；
Partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material property, wherein
Rare earth element Eu is most sensitive to fluid inclusion natures, and δ Eu is that rare earth element is reacted Eu feature after chondrite normalized
One parameter；When Eu > 1 δ, Eu normal anomaly is indicated, then have the high-temperature reductibility fluid from deep that BIFhosted gold deposit is added；When δ Eu <
1, indicate Eu negative anomaly, then it represents that the high-temperature reductibility fluid in BIFhosted gold deposit not from deep, reductive fluid may be come
Oil gas or coal bed gas under ledge in stratum etc.；
4.3 according under pitch blende O isotope, mirror, scanning electron microscope, X diffraction identification material composition, alteration features judge
The source of uranium.
Due to the fractionation of O isotope, pitch blende O isotope cannot directly react the isotope of O in BIFhosted gold deposit,
It needs according to pitch blende-fluid O isotopic equilibrium Fractionation Equations correction.
Pitch blende-fluid O isotopic equilibrium Fractionation Equations are as follows:
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 object；
In equation 5 and equation 6BIFhosted gold deposit O isotope is scaled for pitch blende object O isotope value
The correction value of 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 correction, can compared with magmatic water O isotope value, atmosphere water oxygen are with place value
Judge the source of uranium in BIFhosted gold deposit；
If uranium comes in BIFhosted gold deposit if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value range
From deep；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value range, uranium comes arrogant in BIFhosted gold deposit
Air water effect；
If if the O isotope value in BIFhosted gold deposit falls into the mixed of magmatic water O isotope value and atmospheric water O isotope value
Range is closed, then illustrates have atmospheric water to act on bring uranium in BIFhosted gold deposit, however not excluded that has the uranium from deep, then comprehensive alteration spy
Sign etc. judges the most possible source of uranium.
Formation thickness, earth formation, structure construction occurrence and the distribution surveyed according to step 2, mineralising and the construction of statistics
Positional relationship, the positional relationship of alteration and construction, relationship, the mineralization space distribution feature of mineralising and lithology, in the red beds of extraction
The ore control factor of sandstone-type uranium mineralization with respect, using Coreldraw drawing software sketch out stratum, construction, mineralising, alteration space point
Cloth, in conjunction with step 4 analysis as a result, by the uranium mineralization process of sandstone-type uranium mineralization with respect in red beds by Coreldraw Software on Drawing at
Mine ideograph.
The beneficial effects of the present invention are:
It, being capable of effectively structure 1. the present invention has gathered the geologic(al) factors such as stratum, construction, BIFhosted gold deposit, ore-forming material
Sandstone-type uranium deposit mode in red beds is built, Prospecting Sandstone-type Uranium Deposits target area in red beds is effectively predicted；
2. disclosing each geologic process to the control action of U metallogeny；
3. expanding Prospecting Sandstone-type Uranium Deposits space.
Detailed description of the invention
Fig. 1 is Metallogenic Model of Sandstone-type Uranium Deposits construction method flow chart in sedimentary basin red beds；
Fig. 2 is formation of sandstone-type uranium deposits ideograph；
Specific embodiment
With reference to the accompanying drawing to Metallogenic Model of Sandstone-type Uranium Deposits building side in a kind of sedimentary basin red beds provided by the invention
Method is introduced:
Metallogenic Model of Sandstone-type Uranium Deposits construction method in a kind of sedimentary basin red beds:
Step 1 is collected, survey data；
Step 2 carries out Field Geology Investigations；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data processing, analysis and judging result；
Step 5 constructs ore_forming model；
In the step 1, the data for collecting investigation includes regional geologic map, mine geology figure, remote sensing figure, Geophysical-chemical figure
Part；Survey area geologic setting, structural evolution, Basin Evolution, sedimentary evolution background.
In the step 2 to field geology carry out profile survey, at mine area observe and record formation lithology, stratum color,
Whether stratum contains carbon dust, attitude of stratum, formation thickness, construction occurrence, alteration type, Mineralization Features, counts formation thickness, establishes
Earth formation counts the positional relationship of mineralising and construction, the positional relationship of alteration and construction, tentatively judges sandstone-type uranium in red beds
Ore control factor, acquisition the mineralising sandstone, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample of mine；It is described select it is monomineralic
Sample of sandstone is no less than 1kg.
The step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
3.1 are switched to sample of sandstone the fluid inclusion piece of the light thin slice of 0.3mm or so, 0.5mm or so, in optical microphotograph
The material composition and alteration features of lens-belowed identifying sandstone use the chemical group of JXA-8100 electron microprobe examination analysis uranium mineral
Divide the existence form with uranium；Temperature is wrapped up using cold and hot measurement of Linkam THMSG600, temperature-measuring range is -196 DEG C~
600 DEG C, inclusion gas phase constituent is measured with LABHR-VIS LabRAM HR800 type Laser-Raman microspectroscopy；
3.2, by 15g sandstone block sample, 15g mud stone block sample, use the II qualitative mirror of type scanning electron microscope of TESCAN VEGA
Determine material composition, then block sample is crushed to 300 mesh, uses D8 DISCOVER type X-ray diffractometer according to SY/T 5163-2010
Quantitative analysis substance component；
Sandstone, mudstone sample are crushed to 200 mesh, no less than 50g by 3.3, and use AB-104L, PW2404 to its powder
Xray fluorescence spectrometer measures Main elements, measures microelement using ELEMENT Plasma Mass Spectrometer；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende object and carbonate cements.It uses
ISOPROBE-T instrument carries out U-Pb isotope tracling method to pitch blende, measures pitch blende O isotope using MAT253；It uses
253 instrument of MAT carries out C-O isotope assay to carbonate.
Step 4 test data processing, analysis and judging result the following steps are included:
4.1 judge that material composition, alteration are special according to optical microphotograph lens-belowed identifying, scanning electron microscope identification, X diffraction analysis data
Sign；
The material composition, emphasis determine whether the acid volcanics that can provide uranium；
The alteration features, emphasis judgement and the close choritization of relationship to uranium ore formation, carbonation, zeolitization, volcano
Glass devitrification etc.；
4.2 according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C-O isotope value, mine
Change sandstone rare earth element characteristic and judges fluid inclusion natures and source；
Since isotope fractionation acts on, the C-O isotope value of carbonate cements cannot directly reflect the C-O of BIFhosted gold deposit
Isotope value is needed according to calcite-fluid C-O isotopic equilibrium Fractionation Equations correction.
Calcite-fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation are as follows:
δ in equation 113CPDB- fluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB- calciteFor the same position C of carbonate cements
Element value.
In equation 2 and equation 1C in BIFhosted gold deposit is scaled for carbonate cements C isotope value
The correction value of 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 are as follows:
δ in equation 318OSMOW- fluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW- calciteIt is same for the O of carbonate cements
Position element value.
In equation 3 and equation 4O in BIFhosted gold deposit is scaled for carbonate cements O isotope value
The correction value of 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 correction is thrown into δ13CPDB—δ18OSMOWIn figure, BIFhosted gold deposit source is judged；
Partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material property, wherein
Rare earth element Eu is most sensitive to fluid inclusion natures, and δ Eu is that rare earth element is reacted Eu feature after chondrite normalized
One parameter；When Eu > 1 δ, Eu normal anomaly is indicated, then have the high-temperature reductibility fluid from deep that BIFhosted gold deposit is added；When δ Eu <
1, indicate Eu negative anomaly, then it represents that the high-temperature reductibility fluid in BIFhosted gold deposit not from deep, reductive fluid may be come
Oil gas or coal bed gas under ledge in stratum etc.；
4.3 according under pitch blende O isotope, mirror, scanning electron microscope, X diffraction identification material composition, alteration features judge
The source of uranium.
Due to the fractionation of O isotope, pitch blende O isotope cannot directly react the isotope of O in BIFhosted gold deposit,
It needs according to pitch blende-fluid O isotopic equilibrium Fractionation Equations correction.
Pitch blende-fluid O isotopic equilibrium Fractionation Equations are as follows:
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 object；
In equation 5 and equation 6BIFhosted gold deposit O isotope is scaled for pitch blende object O isotope value
The correction value of 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 correction, can compared with magmatic water O isotope value, atmosphere water oxygen are with place value
Judge the source of uranium in BIFhosted gold deposit；
If uranium comes in BIFhosted gold deposit if the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value range
From deep；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value range, uranium comes arrogant in BIFhosted gold deposit
Air water effect；
If if the O isotope value in BIFhosted gold deposit falls into the mixed of magmatic water O isotope value and atmospheric water O isotope value
Range is closed, then illustrates have atmospheric water to act on bring uranium in BIFhosted gold deposit, however not excluded that has the uranium from deep, then comprehensive alteration spy
Sign etc. judges the most possible source of uranium.
Formation thickness, earth formation, structure construction occurrence and the distribution surveyed according to step 2, mineralising and the construction of statistics
Positional relationship, the positional relationship of alteration and construction, relationship, the mineralization space distribution feature of mineralising and lithology, in the red beds of extraction
The ore control factor of sandstone-type uranium mineralization with respect, using Coreldraw drawing software sketch out stratum, construction, mineralising, alteration space point
Cloth, in conjunction with step 4 analysis as a result, by the uranium mineralization process of sandstone-type uranium mineralization with respect in red beds by Coreldraw Software on Drawing at
Mine ideograph.
Embodiment 1
Step 1: data collection investigation
Collection ten thousand regional geologic map of 1:10,1:2000 mine geology figure, ten thousand remote sensing figure of 1:10, survey area geologic setting,
Such as survey area tectonic setting, Basin Evolution background, workspace is by the shadow from the big rift valley in the Africa that the early stage Cretaceous period germinates
It rings, in the Cretaceous period, workspace is in extensional state generally in tensile state, fracture.
Step 2: Field Geology Investigations
(1) area A Zelike Lower Cretaceous Series A Sawua group is connect with slight angle unconformity and the Jurassic system unconformity that underlies
Touching is contacted with the integration of Lower Cretaceous Series Yi Lazeer group is above covered.A Zelike group is with a thickness of 20~40m, and sandstone is with middle coarse grain landwaste
It is delta front distributary channel sandstone based on sandstone.Channel sandstone is in north north east to spread in the area A Zelike, be can recognize
Two distributary channels out.The Yi Lazeer group mud stone of thickness about 200m is covered in A Zelike group, mud stone presss from both sides the purple of 5 thickness about 2~5m
Red tufa stone.A Zelike group and Yi Lazeer group are maroon stratum.
(2) the main structural grain in the area A Zelike is east northeast to secondary structural grain is NW trending.East northeast is to A Zeli
Gram major rupture is regional fault, cuts basin substrate, which provides the channel of deep fluid rising.NW trending tomography is equal
Development is in the cap rock of basin, and for tomography scale compared with east northeast to small, it is disconnected that more intensive NW trending high angle extensional is developed in mineralising area
It splits.
(3) celadon reduction alteration is developed in mineralising area in the area A Zelike, and celadon reduction alteration is controlled by NW trending
Tomography, celadon reduction alteration are distributed along NW trending tomography.Mineralising is developed in celadon reduction alteration sandstone, mineralising sandstone
On be all covered with the Yi Lazeer group celadon reduction alteration mud stone of several tens cm to 2m thickness.
(4) mineralising is plate-like, is located at the top of A Sawua group sandstone within the scope of thickness about 2m~4m.Mineralising sandstone is calcareous
It is cementing strong, see Cu concentrate grade and uranium mineralization association.
(5) 5, celadon mineralising sandstone, 5, the non-mineralising sandstone of maroon, 3, celadon mud stone, maroon mud stone are acquired
3, aubergine mudstone 3.
Extracting A Zelike uranium deposit ore control factor by above-mentioned (1), (2), (3), (4) is river channel sand, NW trending
Fracture, celadon reduction alteration band.
Step 3: sample treatment and rock-mineral determination, chemical analysis
Non- mineralising sandstone, mineralising sandstone make light thin slice, carry out rock-mineral determination to light thin slice；Mineralising sandstone makes fluid packet
Body piece is wrapped up in, thermometric is carried out to fluid inclusion and gas phase composition measures.It is non-mineralising sandstone, mineralising sandstone, celadon mud stone, brown red
Color mud stone, aubergine tufa stone are scanned Electronic Speculum, X diffraction analysis, geochemical analysis.Pitch blende is selected to mineralising sandstone
Object, carbonate cements, and be all plain measurement to asphalite progress U-Pb isotope tracling method, O, C- is carried out to carbonate cements
O isotope assay.
By rock-mineral determination, scanning electron microscope, the test of X diffraction, A Sawua group mineralising sandstone and non-mineralising sandstone are rich in
Material from acidic volcanic glass (material from acidic volcanic glass uranium content is high), analcitization is strong, develops material from acidic volcanic glass devitrification.Yi Laze
You organize maroon mud stone, celadon mud stone, aubergine tufa stone and develop analcitization.
Analcime is that material from acidic volcanic glass acts on being formed with atmospheric water under lower temperature, pressure, the mistake of analcitization
Cheng Zhong, material from acidic volcanic glass release uranium enter fluid, provide uranium element for U metallogeny.Material from acidic volcanic glass devitrification be it is a kind of from
The effect of hair, the uranium of big ionic radius cannot be introduced into quartz crystal during devitrification, is discharged into fluid, be uranium at
Mine provides uranium element.
By lens-belowed identifying and electron probing analysis, uranium mainly exists with pitch mineral, secondly for coffinite, with cement
Form is present in clast intergranular pore, clast crack and the hole of sandstone.Common uranium and copper association.
Fluid-rock system displays temperature range is 60 DEG C~140 DEG C, is concentrated mainly on 80 DEG C~100 DEG C, average temperature
Degree is 95 DEG C.Fluid inclusion gas phase composition is H2、CO2、CH4、N2, wherein H2For strong reducing substances, reduction is provided for U metallogeny
Agent, H2From deep, it is impossible to come from earth's surface.
Mineralising sandstone rare earth element characteristic is shown as apparent Eu normal anomaly, and instruction has the high-temperature reductibility stream from deep
Body is added in BIFhosted gold deposit.
The pitch blende U-Pb isotope tracling method picked out in mineralising sandstone shows that the A Zelike Uranium Deposit age is
101.3 ± 2.0Ma is Later Early Cretaceous.
The C-O isotope of mineralising sandstone carbonate cements passes through calcite-fluid C-O isotopic equilibrium Fractionation Equations
After correction, then throw into δ13CV-PDB—δ18OV-SMOWThe C in BIFhosted gold deposit is shown in figure from earth mantle, O comes from magmatic water and atmosphere
The mixing of water illustrates that BIFhosted gold deposit is the mixing of earth mantle reductive fluid and atmospheric water.
The pitch blende O isotope picked out in mineralising sandstone passes through pitch blende-fluid O isotopic equilibrium fractionation side
After journey correction, display BIFhosted gold deposit has apparent atmospheric water effect.In conjunction with stratum richness material from acidic volcanic glass, development analcime
Change, volcanic glass devitrification, illustrates the uranium in A Zelike uranium deposit from stratum itself.
Step 5: building ore_forming model
According to the earth formation of step 2, lithology, construction, Mineralization Features and the ore control factor of extraction, in conjunction with step 4
It analyzes and determines as a result, building A Zelike formation of sandstone-type uranium deposits mode, and with Coreldraw Software on Drawing ore_forming model
(Fig. 2).
I: the A Sawua period early stage Cretaceous period, the area A Zelike deposited maroon and be rich in based on middle kern stone
The A Sawua group of material from acidic volcanic glass then covers at least about 200m thickness on Yi Laze phase at that time, A Sawua group
Maroon mud stone, 5 sets aubergine tufa stones are pressed from both sides in mud stone, rich in acidity volcanic tuff in mud stone.A Sawua group river
Sand body has good permeability, that is, is conducive to BIFhosted gold deposit and circulates in sand body, and it is empty that good appearance mine can be provided for U metallogeny
Between.In A Sawua group and Yi Lazeer group it is abundant acidity volcanics good uranium source can be provided for U metallogeny.
II: at Later Early Cretaceous (101.3Ma), the area A Zelike is influenced by African big rift valley, and A Zelike is big
Fracture is in extensional state, and the reductive fluid from earth mantle rises along A Zelike major rupture, and reductive fluid enters and A Ze
In gram fracture link up northwestward faults continue up flowing, when encounter thick-layer Yi Lazeer group mud stone closure when, reproducibility
Fluid enters laterally sand body at the top of the good A Sawua group of permeability, forms in sand body along northwest (NW) at the top of the A Sawua group
To the reduction space of distribution of faults.Analcitization and volcano due to volcanics acid in A Sawua group and Yi Lazeer group
Glass devitrification, uranium element enter atmosphere aqueous fluid, and uranium enters reduction space with fluid, and oxidation-occurs also with reductive fluid
Original reaction, uranium precipitating and enrichment of ore-forming in reduction space.
Claims (2)
1. Metallogenic Model of Sandstone-type Uranium Deposits construction method in a kind of sedimentary basin red beds, it is characterised in that:
Step 1 is collected, survey data；
Step 2 carries out Field Geology Investigations；
Profile survey is carried out to field geology in the step 2, observes and records formation lithology, stratum color, stratum at mine area
Whether containing carbon dust, attitude of stratum, formation thickness, construction occurrence, alteration type, Mineralization Features, formation thickness is counted, stratum is established
Structure counts the positional relationship of mineralising and construction, the positional relationship of alteration and construction, tentatively judges sandstone-type uranium mineralization with respect in red beds
Ore control factor, acquisition mineralising sandstone, non-mineralising sandstone, alteration mud stone, non-alteration mudstone sample；It is described to select monomineralic sandstone
Sample is no less than 1kg；
Step 3, sample treatment, rock-mineral determination and geochemical analysis；
Step 4, test data processing, analysis and judging result；
Step 5 constructs ore_forming model；
In the step 1, the data for collecting investigation includes regional geologic map, mine geology figure, remote sensing figure, Geophysical-chemical graph；It adjusts
Look into geology background, structural evolution, Basin Evolution, sedimentary evolution background；
The step 3 sample treatment, rock-mineral determination and geochemical analysis include four parts:
3.1 are switched to sample of sandstone the fluid inclusion piece of the light thin slice of 0.3mm or so, 0.5mm or so, under an optical microscope
Identify sandstone material composition and alteration features, using JXA-8100 electron microprobe examination analysis uranium mineral chemical constituent and
The existence form of uranium；Temperature is wrapped up using cold and hot measurement of Linkam THMSG600, temperature-measuring range is -196 DEG C~600
DEG C, inclusion gas phase constituent is measured with LABHR-VIS LabRAM HR800 type Laser-Raman microspectroscopy；
3.2, by 15g sandstone block sample, 15g mud stone block sample, use II type scanning electron microscope Qualitative Identification object of TESCAN VEGA
Matter component, then block sample is crushed to 300 mesh, it is quantitative using D8DISCOVER type X-ray diffractometer according to SY/T 5163-2010
Analyze material composition；
Sandstone, mudstone sample are crushed to 200 mesh, no less than 50g by 3.3, and use AB-104L, PW2404X ray to its powder
Fluorescence Spectrometer measures Main elements, measures microelement using ELEMENT Plasma Mass Spectrometer；
Mineralising sample of sandstone is crushed to 80 mesh by 3.4, selects pitch blende object and carbonate cements；Use ISOPROBE-T instrument
Device carries out U-Pb isotope tracling method to pitch blende, measures pitch blende O isotope using MAT253；Use 253 instrument of MAT
C-O isotope assay is carried out to carbonate.
2. Metallogenic Model of Sandstone-type Uranium Deposits construction method in a kind of sedimentary basin red beds according to claim 1, feature
Be: step 4 test data processing, analysis and judging result the following steps are included:
4.1 judge material composition, alteration features according to optical microphotograph lens-belowed identifying, scanning electron microscope identification, X diffraction analysis data；
The material composition, emphasis determine whether the acid volcanics that can provide uranium；
The alteration features, emphasis judgement and the close choritization of relationship to uranium ore formation, carbonation, zeolitization, volcanic glass
Devitrification；
4.2 according to Fluid inclusions temperature, fluid inclusion gas phase composition, carbonate cements C-O isotope value, mineralising sand
Rock rare earth element characteristic judges fluid inclusion natures and source；
Since isotope fractionation acts on, the C-O isotope value of carbonate cements cannot directly reflect the same position the C-O of BIFhosted gold deposit
Element value is needed according to calcite-fluid C-O isotopic equilibrium Fractionation Equations correction；
Calcite-fluid carbon isotope HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equation are as follows:
δ in equation 113CPDB- fluidFor the C isotope value in BIFhosted gold deposit, δ13CPDB- calciteFor the C isotope of carbonate cements
Value；
In equation 2 and equation 1The same position C in BIFhosted gold deposit is scaled for carbonate cements C isotope value
The correction value of element 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 are as follows:
δ in equation 318OSMOW- fluidFor the O isotope value in BIFhosted gold deposit, δ18OSMOW- calciteFor the O isotope of carbonate cements
Value；
In equation 3 and equation 4The same position O in BIFhosted gold deposit is scaled for carbonate cements O isotope value
The correction value of element 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 correction is thrown into δ13CPDB—δ18OSMOWIn figure, BIFhosted gold deposit source is judged；
Partition of rare earth element feature using the mineralising sandstone after chondrite normalized judges metallogenic material property, wherein rare earth
Element Eu is most sensitive to fluid inclusion natures, and δ Eu is rare earth element is reacted Eu feature after chondrite normalized one
Parameter；When Eu > 1 δ, Eu normal anomaly is indicated, then have the high-temperature reductibility fluid from deep that BIFhosted gold deposit is added；When Eu < 1 δ, table
Show Eu negative anomaly, then it represents that the high-temperature reductibility fluid in BIFhosted gold deposit not from deep, reductive fluid may be from containing
Oil gas or coal bed gas under ore bed in stratum；
4.3 according under pitch blende O isotope, mirror, scanning electron microscope, X diffraction identification material composition, alteration features judge uranium
Source；
Due to the fractionation of O isotope, pitch blende O isotope cannot directly react the isotope of O in BIFhosted gold deposit, need
According to pitch blende-fluid O isotopic equilibrium Fractionation Equations correction；
Pitch blende-fluid O isotopic equilibrium Fractionation Equations are as follows:
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 object；
In equation 5 and equation 6BIFhosted gold deposit O isotope value is scaled for pitch blende object O isotope value
Correction 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 correction can determine whether compared with magmatic water O isotope value, atmosphere water oxygen are with place value
The source of uranium in BIFhosted gold deposit；
If the O isotope value in BIFhosted gold deposit falls into magmatic water O isotope value range, uranium comes from deep in BIFhosted gold deposit；
If the O isotope value in BIFhosted gold deposit falls into atmospheric water O isotope value range, uranium comes from atmospheric water in BIFhosted gold deposit
Effect；
If the O isotope value in BIFhosted gold deposit falls into the blend range of magmatic water O isotope value and atmospheric water O isotope value,
Then illustrate there is atmospheric water to act on bring uranium in BIFhosted gold deposit, however not excluded that have the uranium from deep, then comprehensive alteration features judgement
The most possible source of uranium；
The positional relationship of formation thickness, earth formation, the mineralising of statistics and the construction surveyed according to step 2, alteration and construction
Positional relationship, the ore control factor of sandstone-type uranium mineralization with respect, sketches out stratum, structure using Coreldraw drawing software in the red beds of extraction
It makes, mineralising, the spatial distribution of alteration, in conjunction with analyzing as a result, the uranium mineralization process of sandstone-type uranium mineralization with respect in red beds is led to for step 4
Cross Coreldraw Software on Drawing ore_forming model figure.
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