CN104076393A - Recognizing method for concealed mineralization tectonic zone of granite type uranium deposit - Google Patents
Recognizing method for concealed mineralization tectonic zone of granite type uranium deposit Download PDFInfo
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Abstract
The invention relates to a geological survey method and particularly discloses a recognizing method for a concealed mineralization tectonic zone of granite type uranium deposit. The recognizing method comprises the first step of manufacturing a large-scale remote sensing structural interpretation map, the second step of selecting a structural alteration zone A beneficial to mineralization is selected on the large-scale remote sensing structural interpretation map, the third step of extracting chemical detection information to obtain a structural alteration zone B beneficial to mineralization, the fourth step of extracting physical detection information to obtain a structural alteration zone C beneficial to mineralization, and the fifth step of determining a preferred mineralization target region. As geology, physics, chemistry and remote sensing methods are combined, the deep mineralization beneficial section of uranium can be recognized accurately, and a basis is provided for uranium prospecting and preference prediction.
Description
Technical field
The present invention relates to a kind of geological mapping method, be specifically related to the latent ore-forming structure band recognition methods of a kind of granite type U-ore.
Background technology
Granite type U-ore is one of four major types of China's uranium ore, for Uranium Ore Deposits In Granitoid, it is inadequate only having rich uranium grouan, structure alteration zone plays appearance ore deposit and leads ore deposit effect in grouan hot-liquid type uranium ore, can provide passage for the migration of ore deposit liquid, can, for enrichment of ore-forming provides place, be again the concentrated expression of information of mineralization again simultaneously.Ore-forming structure research forms mechanical mechanism and constructs the control action of the migration of ore deposit liquid, enrichment discipline significant understanding ore-forming structure.Ore-forming structure alteration zone is a part for structure alteration zone, and how in numerous structure alteration zones, identifying, surveying ore-forming structure alteration zone is the gordian technique of looking for ore deposit on face.Therefore ore-forming structure alteration zone is studied looking for ore deposit to have directive significance.
Identification, the detection means of prior art to granite type U-ore ore-forming structure band is comparatively single.Granite Region, south is with a varied topography, vegetation is luxuriant, and the identification of ore-forming structure band, mainly taking gamma-spectrometry as main, is aided with other radioactivity survey method, and this,, to finding the effective of superficial part ore-forming structure band, is but difficult to reflection deep ore-forming structure band.Now the difficulty of deep prospecting is increasing, and particularly the distinguishing mark of deep ore-forming structure is most important to finding granite type U-ore to set up ore-forming structure.Therefore, need further in-depth research ground-thing-change-distant method, select a set of combination of the effective ways for deep ore-forming structure band.
Summary of the invention
The technical problem to be solved in the present invention is to provide the latent ore-forming structure band recognition methods of a kind of granite type U-ore, and the method can reach higher recognition accuracy to uranium deep ore-forming structure band.
For solving the problems of the technologies described above, technical scheme provided by the present invention is:
The latent ore-forming structure band recognition methods of a kind of granite type U-ore, it comprises the following steps:
Step (1), makes large scale remote sensing structure explanation figure;
Step (2) is chosen the structure alteration zone A that is conducive to into ore deposit on large scale remote sensing structure explanation figure;
Step (3), extraction chemical probing information obtains being conducive to into the structure alteration zone B in ore deposit;
Step (4), extracts physical detection information obtains being conducive to into the structure alteration zone C in ore deposit;
Step (5), determines and is preferably target area, ore deposit.
Described step (1) comprises
(1.1) on remote sensing image, set up rift structure remote sensing interpret tag;
(1.2) rift structure remote sensing interpret tag is marked on remote sensing image, obtain large scale Remote Sensing Structural Interpretation figure.
Described rift structure remote sensing interpret tag comprises: the negative land form of the linear alignment, linear pattern cheuch, linear tonal anomaly band, the interrupted negative land form distributing of linearity.
The structure alteration zone A that is conducive to into ore deposit in described step (2) comprises: 1. many group rift structures position that crosses on region, and ore-forming structure band is taking a property turned round as main, connected region ore-controlling structure; 2. time magmation of many phases is grown Mafic Dikes, granitello etc. in position, particularly late period and is grown location; 3. location is grown in hydrothermal alteration, comprises the line style alteration growth locations such as the face type alterations such as ore deposit muscovitization in early stage, alkali explanation, sericitization and metallogenic period silication, haematization, pyritization, atropurpureus fluorite; 4. dissimilar metallogenetic structure surface development position, as different lithology contact site, structure alteration zone intersect compound position.
Described step (3) comprises
(3.1) the large scale remote sensing structure explanation figure deploy chemical probing workspace obtaining in step (1), comprising: 1. large, the good uranium component of continuity of area, soil thermoluminescence exceptions area; 2. fit and the abnormal distributive province of uranium component of progressively concentrating and the stronger abnormal concentration center of uranium component; 3. U, Mo, the abnormal recombination region corresponding to deep component in fault structure zone of Be component combination;
(3.2) draw respectively U component isogram, Be component isogram, Mo component isogram, the soil thermoluminescence isogram of chemical probing workspace, the abnormal area in the drawing of gained is chosen for to the structure alteration zone B that is conducive to into ore deposit.
Described step (4) comprises
(4.1) the large scale remote sensing structure explanation figure deploy physical detecting workspace obtaining in step (1), comprising: have a large amount of mineralising abnormity point, but known configuration alteration zone is less, and extends spread region in confused situation to deep;
(4.2) on physical detecting workspace, gather Audio Magnetotelluric Souding data and ground high-precision magnetic survey data; According to underground medium resistivity distribution feature after Audio Magnetotelluric Souding inverting and earth's surface magnetic signature, the value that combined high precision magnetic survey curve occurs is abnormal, and delineation is conducive to into the structure alteration zone C in ore deposit.
Described step (5) comprises
The structure alteration zone C that is conducive to into ore deposit that the structure alteration zone B that is conducive to into ore deposit that the structure alteration zone A that is conducive to into ore deposit, the step (3) that step (2) is obtained obtains obtains with step (4) marks respectively on large scale remote sensing structure explanation figure, common composition is preferably target area, ore deposit, i.e. the latent ore-forming structure band of granite type U-ore.
Useful technique effect of the present invention is:
The latent ore-forming structure band recognition methods of a kind of granite type U-ore provided by the present invention, by by geology, physics, chemistry, remote sensing technique combination, can accurately be identified the favourable section in one-tenth ore deposit, uranium deep, for Prospecting For Uranium and preferred prediction work provide foundation.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The application region of the present embodiment is the Chinese long row-school col section in all Guangnans (hereinafter to be referred as " local area ").
The latent ore-forming structure band recognition methods of a kind of granite type U-ore provided by the present invention comprises the following steps:
Step (1), makes large scale remote sensing structure explanation figure.
(1.1) on remote sensing image, set up rift structure remote sensing interpret tag;
Adopt French Pleiades-1 satellite remote-sensing image, by obtaining the Structural Characteristics of Cenozioc Faulted Structure of atural object, detection of run-out structure remote sensing interpret tag.The Main Fracture Structures of local area has east northeast to～east northeast east orientation, northern west and nearly north-south three groups.Due to the character of fracture structure difference of each side, they also show different features on remote sensing image.Nearly north-south rift structure remote sensing interpret tag is comparatively hidden linear feature, and the negative land form of the comparatively wide slow the linear alignment of tool; East northeast to～east northeast east orientation rift structure remote sensing interpret tag is linear pattern cheuch, linear tonal anomaly band, has obvious linear image feature; North west rift structure remote sensing interpret tag is dark large linear pattern cheuch or the interrupted negative land form distributing of linearity.
(1.2) rift structure remote sensing interpret tag is marked on remote sensing image, obtain large scale Remote Sensing Structural Interpretation figure.
Rift structure remote sensing interpret tag obtained above is marked on remote sensing image to the Remote Sensing Structural Interpretation figure of complete local area whole district 1:25000 and local area east 1:10000.
Step (2) is chosen the structure alteration zone A that is conducive to into ore deposit on large scale remote sensing structure explanation figure.
The structure alteration zone A that is conducive to into ore deposit comprises: 1. many group rift structures position that crosses on region, and ore-forming structure band is taking a property turned round as main, connected region ore-controlling structure; 2. time magmation of many phases is grown Mafic Dikes, granitello etc. in position, particularly late period and is grown location; 3. location is grown in hydrothermal alteration, comprises the line style alteration growth locations such as the face type alterations such as ore deposit muscovitization in early stage, alkali explanation, sericitization and metallogenic period silication, haematization, pyritization, atropurpureus fluorite; 4. dissimilar metallogenetic structure surface development position, as different lithology contact site, structure alteration zone intersect compound position.
Long row's section of local area is positioned at south, mineral deposit, cotton hole, and intersects compound with the fracture of oily hole.Main ore bearing structure is with a band, b band, c band.A band, for the important storage ore deposit structure of local area, has been controlled You Dong mineral deposit and numerous abnormity point, visible silication fragmented rock, fractured granites, siliceous arteries and veins and middle Mafic Dikes in a band, and in You Dong mineral deposit, You Dong-Tuo Tong ridge one band is shown in obvious uranium mineralization.B band, c band south are constructed larger, and hydrothermal alteration is grown.Field observation is visible, and b band, c band structural belt south are all along zanjon spread, and extension is far away.The visible obvious siliceous skeleton in b band southern areas, is made up of siliceous arteries and veins, silication fragmented rock and strong alteration fractured granites, sees obvious celadon hydromica and bronzing haematization alteration; Though c is with southern field not observe obvious hydrothermal alteration, rarely seen a small amount of siliceous scun and local alteration, c band has branch buckling phenomenon along walking tendency.
The school col section of local area is positioned at water stone ore bed the north, is positioned at oily hole zone of fracture and zone of fracture clamp area, cotton hole.Grow this area the nearly north-south structures alteration zones such as d band, e band, and alteration zone all has certain scale.This area's hydrothermal alteration is grown, the common celadon damouritization in earth's surface, bronzing haematization, and the siliceous arteries and veins of wide about 1m flesh pink is seen in part.
Therefore, choose a band, b band, c band, d band, e band for being conducive to into the structure alteration zone A in ore deposit.
Step (3), extraction chemical probing information obtains being conducive to into the structure alteration zone B in ore deposit.
(3.1) the large scale remote sensing structure explanation figure deploy chemical probing workspace obtaining in step (1), comprising: 1. large, the good uranium component of continuity of area, soil thermoluminescence exceptions area; 2. fit and the abnormal distributive province of uranium component of progressively concentrating and the stronger abnormal concentration center of uranium component; 3. U, Mo, the abnormal recombination region corresponding to deep component in fault structure zone of Be component combination;
Length row's section of local area is crossing with ore bearing structure oil hole zone of fracture, and long row's section has obvious chemical probing abnormal with western part of learning pool col section.School col section is between cotton hole zone of fracture and oily hole zone of fracture, and time magmation of many phases is grown, and grows many approximately EW lamprophyre arteries and veins and granite porphyry arteries and veins, and grows alkali metasomatite; Learn the visible obvious chemical probing in col section east, the pool abnormal.
For this reason, dispose the first chemical probing workspace in western part of long row's section and pool col section, by line-spacing 100m, point, apart from 20m sampling, arranges 55 surveys line, 4817 measuring points altogether.Dispose the second chemical probing workspace in col section east, the pool, by line-spacing 100m, point, apart from 20m sampling, need arrange 46 surveys line, 7800 some measuring points altogether.On selected measuring point, sample respectively content information and the thermoluminescence information of U, Mo, Be element.
(3.2) draw respectively U component isogram, Be component isogram, Mo component isogram, the soil thermoluminescence isogram of chemical probing workspace, the abnormal area in the drawing of gained is chosen for to the structure alteration zone B that is conducive to into ore deposit.
With Sufer software development U component isogram, Be component isogram, Mo component isogram and soil thermoluminescence isogram.On U component isogram, be worth as a setting with the U average content of whole measuring points, add 2 times of standard variance sums and determine the anomaly threshold value of U element with background value, the region that delineation is greater than anomaly threshold value is U exceptions area.In like manner, delineation Be exceptions area, Mo exceptions area, soil thermoluminescence exceptions area.
The ore bearing structure bands such as long row's section f band, g band, school col section h band, i band have obvious U, Mo, Be component combination is abnormal and soil thermoluminescence is abnormal, extremely clear in abnormal belt, area is large, have the abnormal distribution pattern of uranium component and 3 the abnormal concentration centers of uranium component that progressively concentrate, and these positions are favourable Cheng Kuang location.
Therefore, choose f band, g band, h band, i band for being conducive to into the structure alteration zone B in ore deposit.
Step (4), extracts physical detection information obtains being conducive to into the structure alteration zone C in ore deposit.
(4.1) the large scale remote sensing structure explanation figure deploy physical detecting workspace obtaining in step (1), comprising: have a large amount of mineralising abnormity point, but known configuration alteration zone is less, and extends spread region in confused situation to deep;
Have a large amount of abnormity point according to local area, but known configuration alteration zone is less, and extends the features such as spread is in confused situation to deep, design altogether 7 AMT surveys line and 7 high-precision magnetic survey lines.High-precision magnetic survey line overall length 41.5km, point is measured apart from pressing 10m, and 4150 sampled points need be set altogether; AMT survey line overall length 41.5km, point is measured apart from pressing 20m, and 2075 sampled points need be set altogether.
(4.2) on physical detecting workspace, gather Audio Magnetotelluric Souding (AMT) data and ground high-precision magnetic survey data; According to underground medium resistivity distribution feature after Audio Magnetotelluric Souding inverting and earth's surface magnetic signature, the value that combined high precision magnetic survey curve occurs is abnormal, and delineation is conducive to into the structure alteration zone C in ore deposit.
The demonstration of physical detecting measurement result, local area is grown a large amount of nearly north-south structures bands, and as j band, k band, m band, n band, visible its intersection in part is compound.Special j band, k band the north and southern areas, deep is extended larger, and general vertical depth can reach 1000m, becomes the formation in ore deposit highly beneficial to uranium.Local area is also grown a large amount of nearly north-souths buried structure band, and extends and can reach about 1000m to deep, the particularly favourable space, Wei Youcheng ore deposit, compound position of different rift structures, and most important is p band and q band contact site, deep.
Therefore, choosing j band, k band, m band, n band and p band is the structure alteration zone C that is conducive to into ore deposit with contact site, deep with q.
Step (5), determines and is preferably target area, ore deposit.
The structure alteration zone C that is conducive to into ore deposit that the structure alteration zone B that is conducive to into ore deposit that the structure alteration zone A that is conducive to into ore deposit, the step (3) that step (2) is obtained obtains obtains with step (4) marks on large scale remote sensing structure explanation figure, common composition is preferably target area, ore deposit, i.e. the latent ore-forming structure band of granite type U-ore.
A band, b band, c band, d band, e band, f band, g band, h band, i band, j band, k band, m band, n band and p band have formed the latent ore-forming structure band of granite type U-ore of acquisition required for the present invention jointly with structural belts such as contacts site, deep with q.
Claims (7)
1. the latent ore-forming structure band recognition methods of granite type U-ore, is characterized in that: it comprises the following steps:
Step (1), makes large scale remote sensing structure explanation figure;
Step (2) is chosen the structure alteration zone A that is conducive to into ore deposit on large scale remote sensing structure explanation figure;
Step (3), extraction chemical probing information obtains being conducive to into the structure alteration zone B in ore deposit;
Step (4), extracts physical detection information obtains being conducive to into the structure alteration zone C in ore deposit;
Step (5), determines and is preferably target area, ore deposit.
2. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 1, is characterized in that: described step (1) comprises
(1.1) on remote sensing image, set up rift structure remote sensing interpret tag;
(1.2) rift structure remote sensing interpret tag is marked on remote sensing image, obtain large scale Remote Sensing Structural Interpretation figure.
3. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 2, is characterized in that: described rift structure remote sensing interpret tag comprises: the negative land form of the linear alignment, linear pattern cheuch, linear tonal anomaly band, the interrupted negative land form distributing of linearity.
4. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 3, it is characterized in that: the structure alteration zone A that is conducive to into ore deposit in described step (2) comprises: 1. many group rift structures position that crosses on region, and ore-forming structure band is to open the property turned round as main, connected region ore-controlling structure; 2. time magmation of many phases is grown Mafic Dikes, granitello etc. in position, particularly late period and is grown location; 3. location is grown in hydrothermal alteration, comprises the line style alteration growth locations such as the face type alterations such as ore deposit muscovitization in early stage, alkali explanation, sericitization and metallogenic period silication, haematization, pyritization, atropurpureus fluorite; 4. dissimilar metallogenetic structure surface development position, as different lithology contact site, structure alteration zone intersect compound position.
5. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 4, is characterized in that: described step (3) comprises
(3.1) the large scale remote sensing structure explanation figure deploy chemical probing workspace obtaining in step (1), comprising: 1. large, the good uranium component of continuity of area, soil thermoluminescence exceptions area; 2. fit and the abnormal distributive province of uranium component of progressively concentrating and the stronger abnormal concentration center of uranium component; 3. U, Mo, the abnormal recombination region corresponding to deep component in fault structure zone of Be component combination;
(3.2) draw respectively U component isogram, Be component isogram, Mo component isogram, the soil thermoluminescence isogram of chemical probing workspace, the abnormal area in the drawing of gained is chosen for to the structure alteration zone B that is conducive to into ore deposit.
6. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 5, is characterized in that: described step (4) comprises
(4.1) the large scale remote sensing structure explanation figure deploy physical detecting workspace obtaining in step (1), comprising: have a large amount of mineralising abnormity point, but known configuration alteration zone is less, and extends spread region in confused situation to deep;
(4.2) on physical detecting workspace, gather Audio Magnetotelluric Souding data and ground high-precision magnetic survey data; According to underground medium resistivity distribution feature after Audio Magnetotelluric Souding inverting and earth's surface magnetic signature, the value that combined high precision magnetic survey curve occurs is abnormal, and delineation is conducive to into the structure alteration zone C in ore deposit.
7. the latent ore-forming structure band recognition methods of a kind of granite type U-ore according to claim 6, is characterized in that: described step (5) comprises
The structure alteration zone C that is conducive to into ore deposit that the structure alteration zone B that is conducive to into ore deposit that the structure alteration zone A that is conducive to into ore deposit, the step (3) that step (2) is obtained obtains obtains with step (4) marks respectively on large scale remote sensing structure explanation figure, common composition is preferably target area, ore deposit, i.e. the latent ore-forming structure band of granite type U-ore.
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