CN112415633B - Comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores - Google Patents
Comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 45
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000000126 substance Substances 0.000 title claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 91
- 229910052704 radon Inorganic materials 0.000 claims abstract description 59
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 58
- 230000005484 gravity Effects 0.000 claims abstract description 54
- 230000009286 beneficial effect Effects 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 19
- 230000002349 favourable effect Effects 0.000 claims abstract description 17
- 238000000605 extraction Methods 0.000 claims abstract description 12
- 230000002159 abnormal effect Effects 0.000 claims description 67
- 238000005070 sampling Methods 0.000 claims description 59
- 230000029087 digestion Effects 0.000 claims description 19
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 8
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 8
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 8
- 239000001099 ammonium carbonate Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 238000005119 centrifugation Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000033558 biomineral tissue development Effects 0.000 abstract description 13
- 238000005553 drilling Methods 0.000 abstract description 5
- 238000011835 investigation Methods 0.000 abstract description 5
- 230000004075 alteration Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000018109 developmental process Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The invention provides a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores, and belongs to the technical field of uranium resource exploration. According to the comprehensive physical and chemical exploration method provided by the invention, soil radon gas instantaneous measurement can be used for rapidly acquiring shallow mineralization information of a working area, soil selective extraction can be used for effectively detecting deep mineralization information, a gravity abrupt change zone is an advantageous part for fracture structure development, and a resistivity low value zone is an advantageous space for deep alteration or mineralization. The invention combines the beneficial ore formation information of the deep part and the shallow part of the working area, determines the favorable ore formation construction condition through the gravity abrupt change zone, determines the favorable vertical ore formation space through the resistivity low-value zone, fuses the favorable ore formation information on the area and the favorable vertical ore formation environment, realizes the spatial positioning prediction of the hidden volcanic uranium ore, and can provide important basis for the drilling position layout and the drilling depth determination of engineering investigation.
Description
Technical Field
The invention relates to the technical field of uranium resource exploration, in particular to a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores.
Background
Volcanic type uranium ores are one of four types of uranium ores in China, and the deep part and the periphery of uranium deposits and uranium ore forming ores are known to have huge ore finding space and good ore finding prospect. As the probability of finding near-surface ores becomes smaller, finding deep blind deposits becomes the main direction of volcanic-type uranium ore exploration. Because the hidden uranium ores are buried deeply, mineralization information displayed on the near surface is very weak, the deep mining requirements cannot be met by means of the traditional method, and the deep mineralization information is acquired through a deep detection technology. At present, the geochemical method capable of acquiring deep mineralization information can only predict a plane area, and cannot effectively predict vertical ore formation depth, so that three-dimensional prediction of an ore formation favorable space is realized.
Therefore, how to effectively obtain deep mineralization information of the hidden volcanic type uranium ores and realize three-dimensional spatial prediction of hidden ore bodies (mineralization) by utilizing multiple elements is a difficult problem to be solved in the prior volcanic type uranium ore exploration.
Disclosure of Invention
Therefore, the invention aims to provide a comprehensive physical and chemical exploration method for realizing the three-dimensional exploration of the hidden volcanic type uranium ores. The comprehensive physical and chemical exploration method provided by the invention can improve the prediction precision and accuracy of the hidden volcanic type uranium ores, and realize the three-dimensional space positioning prediction of the hidden volcanic type uranium ores.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic uranium ores, which comprises the following steps:
carrying out instantaneous measurement of soil radon gas in a working area, and enclosing a soil radon anomaly area;
carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area;
carrying out gravity measurement in a working area, and encircling a gravity abrupt change belt;
carrying out audio magnetotelluric measurement through the multi-element comprehensive abnormal region, and circling a vertical resistivity low-value region;
determining a uranium ore-forming favorable space;
the partition method for determining the beneficial space of uranium ore formation comprises the following steps:
the three-dimensional space formed by the multi-element comprehensive abnormal region, the soil radon abnormal region and the superposition region of the gravity abrupt change zone and the corresponding vertical resistivity low-value region is a class I ore-forming beneficial space;
the three-dimensional space formed by the overlapping area of the multi-element comprehensive abnormal area and the gravity abrupt change zone and the corresponding vertical resistivity low-value area is a class II ore-forming beneficial space;
and a three-dimensional space formed by the multi-element comprehensive abnormal region and the corresponding vertical resistivity low-value region is a class III ore-forming beneficial space.
Preferably, the step of carrying out soil radon instantaneous measurement in the working area and circumscribing the soil radon anomaly area comprises the following steps:
deploying a measuring line in a working area in a direction perpendicular to a main fracture structure of the area, constructing a plurality of sampling points according to a certain degree of network, and measuring the soil radon concentration value of each sampling point; determining the lower limit of the radon concentration abnormality of the soil by a gradual removal method, and defining a radon abnormality area of the soil.
Preferably, the step of carrying out soil selective extraction in the working area and delineating the multi-element comprehensive abnormal area comprises the following steps:
collecting soil samples of clay layers of all sampling points by referring to sampling points of soil radon instantaneous measurement;
respectively adding an extracting agent into each soil sample, sequentially carrying out digestion and centrifugation, and collecting supernatant as digestion liquid;
measuring the U content, the Th content and the Mo content in each digestion solution to obtain the U content, the Th content and the Mo content of each sampling point;
calculating a correlation coefficient R1 of the U content and the Th content and a correlation coefficient R2 of the U content and the Mo content;
respectively solving abnormal lower limits of U element, th element and Mo element by a gradual removal method, and dividing the U content, the Th content and the Mo content of each sampling point by the abnormal lower limits of the corresponding elements to obtain relative element contents AU, ATh and AMo of each sampling point;
acquiring a multi-element comprehensive index of each sampling point based on a multi-element comprehensive index formula;
the multi-element comprehensive index formula is as follows:
Z＝[1/(1+R1+R2)]AU+[R1/(1+R1+R2)]ATh+[R2/(1+R1+R2)]AMo；
wherein Z is a multi-element comprehensive index;
and (3) defining a region formed by sampling points with the multielement comprehensive index being more than 1 as a multielement comprehensive abnormal region.
Preferably, the extractant is a mixed solution of ammonium citrate and ammonium bicarbonate; the concentration of ammonium citrate in the mixed solution is 20-30 g/L, and the concentration of ammonium bicarbonate is 10-20 g/L; the dosage ratio of the soil sample to the extractant is 3.0g: 30-50 mL.
Preferably, the digestion temperature is normal temperature and the time is 4-6 h.
Preferably, the step-wise removal is performed according to a mean value ± 2 mean square error.
Preferably, the gravity measurement is carried out in the working area, and the encircling of the gravity abrupt change belt comprises the following steps:
carrying out gravity measurement at each sampling point by referring to sampling points of soil radon instantaneous measurement, and processing the obtained raw data to obtain Bragg gravity anomaly data; the first derivative of the Bragg gravity abnormal data in the horizontal direction is calculated, the direction is preferably the direction closest to the measuring line, a horizontal derivative equivalent graph is manufactured, and an extreme value zone is defined as a gravity abrupt change zone; the extremum includes a maximum and a minimum.
Preferably, the audio magnetotelluric measurement is performed through the multi-element comprehensive abnormal region, and the delineating the vertical resistivity low-value region includes the following steps:
and referring to sampling points of soil radon instantaneous measurement, carrying out audio magnetotelluric measurement by passing through a multi-element comprehensive abnormal region, and delineating a vertical resistivity low-value region.
The invention provides a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic uranium ores, which comprises the following steps: carrying out instantaneous measurement of soil radon gas in a working area, and enclosing a soil radon anomaly area; carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area; carrying out gravity measurement in a working area, and encircling a gravity abrupt change belt; carrying out audio magnetotelluric measurement through the multi-element comprehensive abnormal region, and circling a vertical resistivity low-value region; determining a uranium ore-forming favorable space; the partition method for determining the beneficial space of uranium ore formation comprises the following steps: the three-dimensional space formed by the multi-element comprehensive abnormal region, the soil radon abnormal region and the superposition region of the gravity abrupt change zone and the corresponding vertical resistivity low-value region is a class I ore-forming beneficial space; the three-dimensional space formed by the overlapping area of the multi-element comprehensive abnormal area and the gravity abrupt change zone and the corresponding vertical resistivity low-value area is a class II ore-forming beneficial space; and a three-dimensional space formed by the multi-element comprehensive abnormal region and the corresponding vertical resistivity low-value region is a class III ore-forming beneficial space.
The beneficial effects are that:
the soil radon instantaneous measurement can rapidly acquire the shallow mineralization information of the working area, the soil selective extraction can effectively detect the deep mineralization information, the gravity abrupt change zone is an advantageous part for the development of a fracture structure, and the resistivity low-value zone is an advantageous space for deep alteration or mineralization. The invention combines the beneficial ore formation information of the deep part and the shallow part of the working area, determines the favorable ore formation construction condition through the gravity abrupt change zone, determines the favorable vertical ore formation space through the resistivity low-value zone, fuses the favorable ore formation information on the area and the favorable vertical ore formation environment, realizes the spatial positioning prediction of the hidden volcanic uranium ore, and can provide important basis for the drilling position layout and the drilling depth determination of engineering investigation.
Drawings
Fig. 1 is a flowchart of a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores.
Detailed Description
The invention provides a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic uranium ores, which comprises the following steps:
carrying out instantaneous measurement of soil radon gas in a working area, and enclosing a soil radon anomaly area;
carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area;
carrying out gravity measurement in a working area, and encircling a gravity abrupt change belt;
carrying out audio magnetotelluric measurement through the multi-element comprehensive abnormal region, and circling a vertical resistivity low-value region;
and determining the uranium ore-forming favorable space.
According to the invention, soil radon instantaneous measurement is carried out in a working area, and a soil radon abnormal area is defined. In the invention, the working area carries out soil radon instantaneous measurement, and the method for defining the soil radon anomaly area preferably comprises the following steps: deploying a measuring line in a working area in a direction perpendicular to a main fracture structure of the area, constructing a plurality of sampling points according to a certain degree of network, and measuring the soil radon concentration value of each sampling point; determining the lower limit of the radon concentration abnormality of the soil by a gradual removal method, and defining a radon abnormality area of the soil. The method for deploying the measuring lines is not particularly limited, and a person skilled in the art can deploy the measuring lines in a direction perpendicular to the main fracture structure of the area according to a conventional technical means. The equipment and the method for measuring the soil radon concentration value of each sampling point are not particularly limited, and the technical means well known to the person skilled in the art can be adopted. In the present invention, the step-wise removal is preferably performed according to the mean ± 2 mean square error. The method is characterized in that the process and parameters for determining the abnormal lower limit of the radon concentration in the soil through a gradual removal method are not particularly limited, and the radon concentration in the soil is determined by adopting technical means well known to those skilled in the art.
According to the invention, the soil radon instantaneous measurement can rapidly acquire the shallow mineralization information of the working area.
According to the invention, soil selective extraction is carried out in a working area, and a multi-element comprehensive abnormal area is defined. In the invention, the soil selective extraction is carried out in a working area, and the method for delineating the multi-element comprehensive abnormal area preferably comprises the following steps:
collecting soil samples of clay layers of all sampling points by referring to sampling points of soil radon instantaneous measurement;
respectively adding an extracting agent into each soil sample, sequentially carrying out digestion and centrifugation, and collecting supernatant as digestion liquid;
measuring the U content, th content and Mo content in each digestion solution;
calculating a correlation coefficient R1 of the U content and the Th content and a correlation coefficient R2 of the U content and the Mo content;
respectively solving abnormal lower limits of U element, th element and Mo element by a gradual removal method, and dividing the U content, the Th content and the Mo content of each sampling point by the abnormal lower limits of the corresponding elements to obtain relative element contents AU, ATh and AMo of each sampling point;
acquiring a multi-element comprehensive index of each sampling point based on a multi-element comprehensive index formula;
and (3) defining a region formed by sampling points with the multielement comprehensive index being more than 1 as a multielement comprehensive abnormal region.
According to the invention, soil samples of clay layers of all sampling points are collected by referring to sampling points for instantaneous measurement of soil radon gas. In the invention, the collection quality of the soil sample is preferably more than or equal to 500g, namely, the soil sample collected at each sampling point can be used for subsequent measurement.
According to the invention, extracting agents are respectively added into each soil sample, and the extracting agents are sequentially digested and centrifuged, and the supernatant is collected as a digestion solution. In the present invention, the soil sample is preferably dried and sieved before adding the extractant; the drying parameters are not particularly limited, and the soil sample can be dried; in the present invention, the mesh number of the screen for sieving is preferably 80 mesh. In the invention, the extracting agent is preferably a mixed solution of ammonium citrate and ammonium bicarbonate; the concentration of ammonium citrate in the mixed solution is preferably 20-30 g/L, and the concentration of ammonium bicarbonate is preferably 10-20 g/L. In the present invention, the ratio of the soil sample to the extractant is preferably 3.0g: 30-50 mL. In the present invention, the temperature of the digestion is preferably room temperature, i.e., no additional heating or no additional cooling is required; the digestion time is preferably 4 to 6 hours. In the present invention, the time of the centrifugation is preferably 30 to 40 minutes.
After digestion liquid is obtained, the invention determines the U content, the Th content and the Mo content in each digestion liquid to obtain the U content, the Th content and the Mo content of each sampling point. In the present invention, the U content, th content and Mo content in each digestion solution are preferably measured by ICP-MS.
After the U content, the Th content and the Mo content of each sampling point are obtained, the invention calculates the correlation coefficient R1 of the U content and the Th content and the correlation coefficient R2 of the U content and the Mo content.
After the U content, the Th content and the Mo content of each sampling point are obtained, the abnormal lower limits of the U element, the Th element and the Mo element are respectively obtained by utilizing a gradual removal method, and the U content, the Th content and the Mo content of each sampling point are respectively divided by the abnormal lower limits of the corresponding element to obtain the relative element contents AU, ATh and AMo of each sampling point. In the present invention, the step-wise removal is preferably performed according to the mean ± 2 mean square error. The method of obtaining the abnormal lower limits of the U element, the Th element and the Mo element by the stepwise removal method is not particularly limited, and the method may be performed by means known to those skilled in the art.
After AU, ATh and AMo of each sampling point are obtained, the multi-element comprehensive index of each sampling point is obtained based on a multi-element comprehensive index formula. In the invention, the multi-element comprehensive index formula is preferably:
Z＝[1/(1+R1+R2)]AU+[R1/(1+R1+R2)]ATh+[R2/(1+R1+R2)]AMo；
wherein Z is a multi-element comprehensive index.
After the multi-element comprehensive index of each sampling point is obtained, the invention defines the area formed by the sampling points with the multi-element comprehensive index more than 1 as a multi-element comprehensive abnormal area.
According to the invention, the soil selective extraction is carried out on the working area, and the ore formation information of the deep part of the working area can be effectively detected.
The invention carries out gravity measurement in a working area and circles a gravity abrupt change belt. In the present invention, the carrying out of the gravity measurement in the working area, the circumscribing of the gravity abrupt change belt preferably comprises the steps of: carrying out gravity measurement by referring to sampling points of soil radon instantaneous measurement, and processing the obtained raw data to obtain Bragg gravity anomaly data; the first derivative of the Bragg gravity abnormal data in the horizontal direction is calculated, the direction is preferably the direction closest to the measuring line, a horizontal derivative equivalent graph is manufactured, and an extreme value zone is defined as a gravity abrupt change zone; the extremum includes a maximum and a minimum. The method for processing the obtained raw data to obtain the Bragg gravity anomaly data is not particularly limited, and technical means well known to those skilled in the art can be adopted. The method for obtaining the first derivative of the Bragg gravity abnormal data in the horizontal direction, manufacturing the derivative isograph in the horizontal direction and delineating the extremum area is not particularly limited, and the technical means well known to the person skilled in the art can be adopted.
In the present invention, the gravity gradient zone reflects the favorable site of development of the fracture structure.
The invention develops the audio magnetotelluric measurement through the multi-element comprehensive abnormal region and circles a vertical resistivity low-value region. In the present invention, the audio magnetotelluric measurement is performed through the multi-element comprehensive anomaly region, and the delineating the vertical resistivity low value region preferably includes the steps of: and referring to sampling points of soil radon instantaneous measurement, developing audio magnetotelluric electricity through the multi-element comprehensive abnormal region, and circling a vertical resistivity low-value region. The method for developing the audio magnetotelluric measurement is not particularly limited, and the method can be realized by adopting technical means well known to those skilled in the art.
In the invention, the resistivity low-value region is a favorable space for deep alteration or mineralization of the working region, and provides depth direction information for uranium ore three-dimensional space prediction.
After the soil radon anomaly area, the multi-element comprehensive anomaly area, the gravity abrupt change zone and the vertical resistivity low-value area are defined, the uranium ore-forming beneficial space is determined. In the invention, the partition method for determining the beneficial space of uranium ores comprises the following steps:
the three-dimensional space formed by the multi-element comprehensive abnormal region, the soil radon abnormal region and the superposition region of the gravity abrupt change zone and the corresponding vertical resistivity low-value region is a class I ore-forming beneficial space;
the three-dimensional space formed by the overlapping area of the multi-element comprehensive abnormal area and the gravity abrupt change zone and the corresponding vertical resistivity low-value area is a class II ore-forming beneficial space;
and a three-dimensional space formed by the multi-element comprehensive abnormal region and the corresponding vertical resistivity low-value region is a class III ore-forming beneficial space.
In the invention, the class I ore formation has the greatest potential of the space ore formation, and class II and class III ore formation.
FIG. 1 is a flow chart of a comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic type uranium ores, wherein instantaneous measurement of soil radon gas is sequentially carried out in a working area, and an abnormal soil radon area is defined; carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area; carrying out gravity measurement in a working area, and encircling a gravity abrupt change belt; aiming at the multi-element comprehensive abnormal region, carrying out audio magnetotelluric measurement, and delineating a vertical resistivity low-value region; and determining the uranium ore-forming favorable space.
The comprehensive physical and chemical exploration method for realizing the three-dimensional exploration of the hidden volcanic type uranium ores provided by the invention is described in detail below by combining with the embodiment, but the method is not to be interpreted as limiting the protection scope of the invention.
Example 1
Taking volcanic type uranium mine investigation in a certain area of the mountain basin in China as an example, the investigation scale is 1:10000, 100m×50m, 133 DEG (perpendicular to the main fracture structure direction) and 15Km 2 。
Step one, carrying out soil radon instantaneous measurement in a working area, and enclosing a soil radon anomaly area:
soil radon gas measurement is carried out in a working area according to the mesh degree of 100m multiplied by 50m, and the soil radon concentration value of the working area is obtained; and determining the abnormal lower limit of the radon concentration of the soil by a gradual removal method (average value +/-2 mean square error), and circling 5 pieces of radon abnormal regions of the soil.
Step two, carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area:
collecting soil samples (sampling points coincide with sampling points of soil radon instantaneous measurement) according to 100m multiplied by 50m of network degree in a working area, and collecting clay layer soil with depth of about 40-50 cm, wherein the sampling quality is more than or equal to 500g; after the soil sample is dried, sieving with a stainless steel sieve of 80 meshes; weighing 3.0g of the sieved-80-mesh soil sample, placing the sample into a polyethylene centrifuge tube, adding 30mL of mixed solution of ammonium citrate and ammonium bicarbonate (wherein the concentration of ammonium citrate in the mixed solution is 20g/L and the concentration of ammonium bicarbonate is 10 g/L), covering a cover, and shaking uniformly; oscillating for 4 hours at normal temperature, centrifuging for 30min in a centrifuge, filtering to obtain supernatant, and preserving to obtain digestion solution; the digestion solution is sent to a laboratory, and U content, th content and Mo content in each sampling point are measured by ICP-MS;
after the content of U, the content of Th and the content of Mo in each sampling point are obtained, calculating the correlation coefficient R1 of U and Th and the correlation coefficient R2 of U and Mo;
obtaining the abnormal lower limit of each element by a gradual removal method (average value +/-2 mean square error), and dividing the content value of each element by the abnormal lower limit to obtain the relative element contents AU, ATh and AMo of each sampling point;
acquiring a multi-element comprehensive index of each sampling point based on a multi-element comprehensive index formula Z= [ 1/(1+R1+R2) ] AU+ [ R1/(1+R1+R2) ] ATh + [ R2/(1+R1+R2) ] AMo;
and (3) defining 6 pieces of multi-element comprehensive abnormal areas in the area formed by sampling points with the multi-element comprehensive index being more than 1.
Step three, carrying out gravity measurement in a working area, and encircling a gravity abrupt change zone:
carrying out gravity measurement (sampling points coincide with sampling points of soil radon instantaneous measurement) according to 100m multiplied by 50m in a working area, processing the obtained original data to obtain Bragg gravity anomaly data, obtaining a first derivative of the Bragg gravity anomaly data at a level of 135 degrees, manufacturing a derivative isograph at the level of 135 degrees, defining an extremum area (comprising a maximum value and a minimum value), and determining 8 gravity abrupt change zones.
Step four, carrying out audio magnetotelluric measurement through the multi-element comprehensive abnormal region, and delineating a vertical resistivity low-value region:
and 6 audio magnetotelluric measurement sections (the point distance is 50m, and the sampling points coincide with the sampling points of the soil radon gas instantaneous measurement) are distributed through 6 multi-element comprehensive abnormal areas along the soil radon gas instantaneous measurement test line, so that the audio magnetotelluric measurement is carried out, and 6 vertical resistivity low-value areas are defined.
Step five, determining a uranium ore-forming favorable space:
2 overlapped areas of the multi-element comprehensive abnormal area, the soil radon abnormal area and the gravity abrupt change zone are altogether, and a three-dimensional space formed by the 2 overlapped areas and the corresponding vertical resistivity low-value area is the class I uranium ore-forming beneficial space;
3 overlapped areas of the multi-element comprehensive abnormal area and the gravity abrupt change zone are altogether, and a three-dimensional space formed by the 3 overlapped areas and the corresponding vertical resistivity low-value area is a class II uranium ore-forming beneficial space;
the three-dimensional space formed by the vertical resistivity low-value area corresponding to the 1-piece multi-element comprehensive abnormal area is a class III uranium ore-forming beneficial space.
The mining potential of the beneficial space of the 2I-stage uranium ores is maximum, and drilling work should be carried out preferentially during engineering investigation.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A comprehensive physical and chemical exploration method for realizing three-dimensional exploration of hidden volcanic uranium ores is characterized by comprising the following steps:
carrying out instantaneous measurement of soil radon gas in a working area, and enclosing a soil radon anomaly area;
carrying out soil selective extraction in a working area, and delineating a multi-element comprehensive abnormal area;
carrying out gravity measurement in a working area, and encircling a gravity abrupt change belt;
carrying out audio magnetotelluric measurement through the multi-element comprehensive abnormal region, and circling a vertical resistivity low-value region;
determining a uranium ore-forming favorable space;
the partition method for determining the beneficial space of uranium ore formation comprises the following steps:
the three-dimensional space formed by the multi-element comprehensive abnormal region, the soil radon abnormal region and the superposition region of the gravity abrupt change zone and the corresponding vertical resistivity low-value region is a class I ore-forming beneficial space;
the three-dimensional space formed by the overlapping area of the multi-element comprehensive abnormal area and the gravity abrupt change zone and the corresponding vertical resistivity low-value area is a class II ore-forming beneficial space;
the three-dimensional space formed by the multi-element comprehensive abnormal region and the corresponding vertical resistivity low-value region is a class III ore-forming beneficial space;
the method for carrying out soil radon instantaneous measurement in the working area and enclosing the soil radon anomaly area comprises the following steps:
deploying a measuring line in a working area in a direction perpendicular to a main fracture structure of the area, constructing a plurality of sampling points according to a certain degree of network, and measuring the soil radon concentration value of each sampling point; determining the lower limit of the radon concentration abnormality of the soil by a gradual removal method, and defining a radon abnormality area of the soil;
the method for selectively extracting soil in the working area and delineating the multi-element comprehensive abnormal area comprises the following steps:
collecting soil samples of clay layers of all sampling points by referring to sampling points of soil radon instantaneous measurement;
respectively adding an extracting agent into each soil sample, sequentially carrying out digestion and centrifugation, and collecting supernatant as digestion liquid;
measuring the U content, the Th content and the Mo content in each digestion solution to obtain the U content, the Th content and the Mo content of each sampling point;
calculating a correlation coefficient R1 of the U content and the Th content and a correlation coefficient R2 of the U content and the Mo content;
respectively solving abnormal lower limits of U element, th element and Mo element by a gradual removal method, and dividing the U content, the Th content and the Mo content of each sampling point by the abnormal lower limits of the corresponding elements to obtain relative element contents AU, ATh and AMo of each sampling point;
acquiring a multi-element comprehensive index of each sampling point based on a multi-element comprehensive index formula;
the multi-element comprehensive index formula is as follows:
Z=[1/(1+R1+R2)]AU+[R1/(1+R1+R2)]ATh+[R2/(1+R1+R2)]AMo；
wherein Z is a multi-element comprehensive index;
and (3) defining a region formed by sampling points with the multielement comprehensive index being more than 1 as a multielement comprehensive abnormal region.
2. The comprehensive physical and chemical detection method according to claim 1, wherein the extracting agent is a mixed solution of ammonium citrate and ammonium bicarbonate; the concentration of ammonium citrate in the mixed solution is 20-30 g/L, and the concentration of ammonium bicarbonate is 10-20 g/L; the dosage ratio of the soil sample to the extractant is 3.0g: 30-50 mL.
3. The comprehensive physical and chemical prospecting method according to claim 1 or 2, wherein the digestion temperature is normal temperature and the time is 4-6 hours.
4. The synthetic physical and chemical detection method according to claim 1, wherein the gradual removal method is performed according to mean ± 2 mean square error.
5. The integrated physical and chemical prospecting method according to claim 1, wherein the step of carrying out the gravity measurement in the working area and defining the gravity abrupt change zone comprises the steps of:
carrying out gravity measurement at each sampling point by referring to sampling points of soil radon instantaneous measurement, and processing the obtained raw data to obtain Bragg gravity anomaly data; the first derivative of the Bragg gravity abnormal data in the horizontal direction is calculated, the direction is preferably the direction closest to the measuring line, a horizontal derivative equivalent graph is manufactured, and an extreme value zone is defined as a gravity abrupt change zone; the extremum includes a maximum and a minimum.
6. The integrated physical and chemical prospecting method according to claim 1, wherein said performing an audio magnetotelluric measurement across said multi-element integrated anomaly region, delineating a vertical resistivity low value region, comprises the steps of:
and referring to sampling points of soil radon instantaneous measurement, carrying out audio magnetotelluric measurement by passing through a multi-element comprehensive abnormal region, and delineating a vertical resistivity low-value region.
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