CN105717551A - Blind ore space positioning method for volcanic rock type uranium mine - Google Patents
Blind ore space positioning method for volcanic rock type uranium mine Download PDFInfo
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Abstract
The invention discloses a blind ore positioning method for a volcanic rock type uranium mine, particularly relating to the blind ore space positioning method for the volcanic rock type uranium mine. The uranium mine space prediction flow comprise steps of initially choosing a key working area, identifying key mine control factors, constructing a uranium mine space positioning mode and a prediction model, combining the identification technology methods of the prediction factors, and drilling and checking. The invention can effectively predict prospecting target of the volcanic rock type uranium mine, performs accurate space positioning on the deep concealed blind ore, directly guides the volcanic rock type uranium mine prospecting, expands the uranium resource quantity of the exhausted mining area, and finds the new uranium mine production area.
Description
Technical field
The invention belongs to uranium geology research and uranium resource electric powder prediction, be specifically related to a kind of volcanic type U-ore blind ore space-location method.
Background technology
Owing to uranium resources in China demand constantly increases, south China mesothermal gold deposits becomes the new growing point of uranium resource and production, the work is now in full swing for new round Prospecting For Uranium, and volcanic type U-ore is China's mesothermal gold deposits main Types, volcanic type U-ore looks for ore deposit and resource expansion work to become the emphasis of south China Prospecting For Uranium.
Along with going deep into of scientific research and preliminry basic research, the working level of earth's surface and near surface is significantly high, and deep blind ore Ore-finding difficulty is increasing, become the Main Bottleneck that south China Hydrothermal Uranium Deposit looks for ore deposit and resource to expand, set up deep concealed Prognosis of Blind Ore integration scenario, carry out deep blind ore and effectively predict location and become current Hydrothermal Uranium Deposit and look for ore deposit in the urgent need to.
The identification of typical case volcanic type U-ore phase mountain ore field uranium ore key ore control factor, component of forecast and forecast model builds, and geology, physical prospecting, change the spy development of complex art method, application, provides possibility for volcanic type U-ore Prognosis of Blind Ore and space orientation.
Summary of the invention
The technical issues that need to address of the present invention are: propose a kind of volcanic type U-ore blind ore space-location method, it is possible to effectively prediction volcanic type U-ore target prospecting area, and deep concealed blind ore is carried out exact space location.
Present invention employs following technical scheme:
A kind of volcanic type U-ore blind ore space orientation technique, the pre-flow gauge of uranium ore space orientation includes primary election major tasks district, the crucial identification of ore control factor, uranium ore space orientation formula and the structure of forecast model, the identification technical method combination of component of forecast, probing verification, specifically includes following steps:
Step one, according to uranium ore uranium formation conditions, crucial ore control factor, carries out region uranium metallogenic prognosis, primary election major tasks district；
Emphasis working area is carried out large scale geologic survey by step 2, structural altered zone is identified, studies；Structural belt hydrothermal alteration zone hydrothermal alteration mineral assemblage, geochemical elements assemblage characteristic are identified, study；
Step 3 utilizes Audio Magnetotelluric Souding, high-precision magnetic survey Combination of Methods, to Structural Characteristics of Cenozioc Faulted Structure in district, basin style feature and late period Characteristics of Veins be identified, study；In conjunction with borehole data, the rift structure of authorized strength work district larger proportion chi, late period vein scattergram, between group, interface, substrate interface are schemed deeply；Set up the three dimensions geological model that working area is made up of interface, substrate interface and vein between rift structure, group；
Step 4 utilizes radon and daughter measurement, ray spectrometric survey Combination of Methods that working area carries out large scale surface sweeping work, draws a circle to approve radon, gamma-ray spectrometry Abnormal Map, extracts U metallogeny information；
Step 5 land used electrochemical method is measured and is analyzed, and the distribution characteristics of working area U metallogeny coherent element is studied, and draws a circle to approve U metallogeny coherent element Abnormal Map, extracts structural belt uranium-many Metals Deposit Ores information；
Step 6 comprehensive geology, physical prospecting, change are made inquiries about breath, working area is carried out integrated forecasting, deep blind ore is effectively positioned；
Step 7 probing verification.
Described a kind of volcanic type U-ore blind ore space orientation technique, the identification of wherein said crucial ore control factor include the identification of Ore-control fault structure, U metallogeny hydrothermal alteration identification and late period vein identification.
Described a kind of volcanic type U-ore blind ore space orientation technique, wherein said Ore-control fault structure be identified by areal geology, Use of Geophysical Data is comprehensively analyzed, it is determined that ore-controlling structure；The identification of described U metallogeny hydrothermal alteration determines that acid alteration and alkalescence alteration overlapping control the space orientation of big ore deposit rich ore, identifies the best metamorphic gold deposit of mineralising；Described late period, the identification of vein included the identification of acidic rock normal pulse intermediate-basic dike in late period.
Described a kind of volcanic type U-ore blind ore space orientation technique, the identification technical method combination of wherein said component of forecast, including geological technique, geophysical prospecting technology and geochemical exploration technique.
Described a kind of volcanic type U-ore blind ore space orientation technique, wherein said geological technique is application Field Geology Investigations, probing, lab analysis integrated approach, identify metallogenic period rift structure, include ascertaining that interface, substrate interface between volcanic basin group, and the Gravitational sliding structure of superposition, volcano rift structure, volcano interlayer are from opening a structural feature；Find out acidic rock normal pulse intermediate-basic dike development characteristics in late period；Find out rift structure and volcanic basin group boundary, substrate interface superimposion position；Find out uranium mineralization acidity alteration, alkalescence metamorphic gold deposit and distribution characteristics thereof and U metallogeny coherent element assemblage characteristic；
Described geophysical prospecting technology combines for application Audio Magnetotelluric Souding and high-precision magnetic survey method, is changed by resistivity transversal inhomogeneity, magnetic field gradient band, demarcation line, magnetic field, changing of the relative positions position, magnetic field, magnetic field a string of bead anomaly, identifies different stage rift structure；
Described geochemical exploration technique is applied geochemistry method, and the geochemical elements distribution characteristics of structural belt is studied, and delineation structural belt U metallogeny coherent element is abnormal.
The invention has the beneficial effects as follows:
(1) a kind of volcanic type U-ore blind ore space-location method of the present invention, choosing typical case volcanic type U-ore phase mountain ore field is object of study, it is applied to ore field deep and peripheral Uranium Metallogenic Prognosis location in time, directly instruct this district's exploration prospecting, it is indicated that ore field deep and periphery have bigger minerogenic potentiality, it is proposed that next step range of reconnaissance, ore prediction and prospecting target area, part target prospecting area has been found that fairly large uranium ore through probing verification, and application prospecting result is notable, has significantly expanded ore field and has looked for space, ore deposit；
(2) a kind of volcanic type U-ore blind ore space-location method of the present invention, for volcanic type U-ore, is applicable not only to phase mountain ore field, is also applied for all volcanic type U-ores；
(3) a kind of volcanic type U-ore blind ore space-location method of the present invention, looks for China's volcanic type U-ore blind ore ore deposit and resource to expand and has important guiding effect, and prospecting result is notable, and popularizing application prospect is wide.
Accompanying drawing explanation
Fig. 1 is phase mountain volcanic type U-ore Prognosis of Blind Ore location model schematic diagram；
Fig. 2 is high in the clouds-trip mill-water distribution major tasks district geologic map；
Fig. 3 is high in the clouds-trip mill-location, king mud pit, water distribution area log sheet；
Fig. 4 is physical prospecting Y1 (a) line and Y2 (b) section result map；
Fig. 5 is high in the clouds-trip mill-water distribution Soils In The Region radon concentration isopleth map；
Fig. 6 is that high in the clouds-trip mill-ground, area, water distribution area electricity extracts uranium Abnormal Map；
Fig. 7 is high in the clouds-trip mill-water distribution area U metallogeny integrated forecasting achievement and exploration verification result map；
Fig. 8 is high in the clouds-trip mill-water distribution granite porphyry target prospecting area 35 line profile；
Fig. 9 is high in the clouds-trip mill-water distribution granite porphyry target prospecting area 27 line profile.
Wherein, Fig. 2: 201-Quaternary system；The broken speckle rhyolite of 202-；203-siltstone, tufa stone；204-dellenite；205-tufa stone, siltstone；206-biotite quartz-schist；207-granite porphyry；208-volcanic collapse constructs；209-volcano interlayer is from opening structure；210-substrate rift constructs；211-fracture, supposition fracture；212-industry ore body projects；213-mineralising projects；214-major tasks district；215-target prospecting area.
Fig. 3: 301-broken speckle rhyolite；302-granite porphyry；303-ruptures；304-joint, crack；305-alkali explanation (albite, hematization)；306-hydromicazation.
Fig. 7: 701-Quaternary system；The broken speckle rhyolite of 702-；703-siltstone, tufa stone；704-dellenite；705-tufa stone, siltstone；706-biotite quartz-schist；707-granite porphyry；708-volcanic collapse constructs；709-volcano interlayer is from opening structure；7010-substrate rift constructs；7011-fracture, supposition fracture；712-industry ore body projects；713-mineralising projects；The higher field of 714-terrestrial radio, High-Field, anomalous field；The higher field of 715-radon concentration, High-Field and anomalous field；716-target prospecting area；717-industry mineralising hole and numbering hole depth thereof；718-mineralising hole and numbering thereof；719-abnormal hole and numbering thereof.
Fig. 8: 801-broken speckle rhyolite；802-porphyritic granite；803-geological boundary；804-oxidized zone；805-holes；806-ore body；807-Orebody Grade.
Fig. 9: 901-broken speckle rhyolite；902-sandstone, tufa stone；903-dellenite；904-sandstone, glutenite；905-porphyritic granite；906-geological boundary；907-oxidized zone；908-holes；909-ore body；910-Orebody Grade.
Detailed description of the invention
Below in conjunction with drawings and Examples, a kind of volcanic type U-ore blind ore space-location method of the present invention is described further.
Embodiment 1
A kind of volcanic type U-ore blind ore space-location method of the present invention, the pre-flow gauge of uranium ore space orientation includes the identification technical method combination of the crucial identification of ore control factor, uranium ore space orientation formula and the structure of forecast model, component of forecast.
The pre-flow gauge of uranium ore space orientation is as follows:
1. according to uranium ore uranium formation conditions, crucial ore control factor, region uranium metallogenic prognosis, primary election major tasks district are carried out；
2. emphasis working area is carried out large scale geologic survey, structural altered zone is identified research；Structural belt hydrothermal alteration zone hydrothermal alteration mineral assemblage, geochemical elements assemblage characteristic are identified research；
3. utilize Audio Magnetotelluric Souding, high-precision magnetic survey Combination of Methods, to Structural Characteristics of Cenozioc Faulted Structure in district (scale, produce turn, extend the degree of depth), basin style feature (between group interface, substrate interface) and late period Characteristics of Veins be identified study；In conjunction with borehole data, the rift structure of authorized strength work district larger proportion chi, late period vein scattergram, interface, substrate interface bathymetric map between group；Set up the three dimensions geological model that working area is made up of interface, substrate interface and vein between rift structure, group；
4. utilize radon and daughter measurement, ray spectrometric survey Combination of Methods that working area carries out large scale surface sweeping work, draw a circle to approve radon, gamma-ray spectrometry Abnormal Map, extract U metallogeny information；
5. utilize geo-electrochemistry method to measure to analyze, the distribution characteristics of working area U metallogeny coherent element is studied, enclose U metallogeny coherent element Abnormal Map, extract structural belt uranium-many Metals Deposit Ores information；
6. comprehensive geology, physical prospecting, change are made inquiries about breath, working area is carried out integrated forecasting, deep blind ore is effectively positioned.Uranium ore orientation criterion: fracture and recombination region, interface, fracture and substrate interface recombination region, fracture and vein recombination region, fracture and explosion breccia pipe recombination region between secondary cranny band, fracture and group, or above-mentioned polytype compound.
7. verification is drilled.Investigate uranium ore occurrence that may be present, scale.
The wherein identification of crucial ore control factor:
By to the ore field ore control factor comprehensive study of phase mountain, propose phase mountain ore field key ore control factor be rift structure, acid alteration alkalescence alteration overlapping, Gravitational sliding structure and substrate interface, late period vein, determining that most critical ore control factor is Ore-controlling Faults, the secondary structural belt of region deep focus fracture controls the blind ore space orientation of ore field deep, phase mountain.
1. the identification of Ore-control fault structure
By the research to Xiangshan basin structural evolution system, it is determined that the secondary Fault dissecting basin of Fuzhou City-Yongfeng deep focus fracture spatial distribution with controlling Zhe Gai district Hydrothermal Uranium Deposit, rift structure is for controlling the sterically defined most critical key element of uranium ore.
The identification of Ore-control fault structure: comprehensively analyzed by areal geology, Use of Geophysical Data, it is determined that ore-controlling structure；Ore-control fault structure grows modern hot-spring, Fluorite Veins (arteries and veins), Mafic Dikes, minor ore body alteration and Geophysical-chemical abnormal information more.
2. the identification of U metallogeny hydrothermal alteration
By the ore field uranium mineralization hydrothermal alteration of phase mountain is studied, it is determined that acid alteration and alkalescence alteration overlapping control the space orientation of big ore deposit rich ore.Uranium mineralization alteration type is divided into alkalescence alteration and acid alteration, and alkalescence alteration is based on albitization, hematization, choritization, carbonation, and acid alteration turns to master with hydromicazation, fluorite.Alteration zone directly control distribution and the scale of uranium mineralization.
The identification of U metallogeny hydrothermal alteration:
Identify the best metamorphic gold deposit of mineralising: alkalescence altered mineral is combined as receives Anhydrite-bloodstone-chlorite-carbonate；Acid altered mineral is combined as fluorite-illite (illite/smectite mixed layer)-chlorite-apatite.Albitization, hematization, choritization, carbonation, hydromicazation, fluorite are combined as the best metallogenic assemblage of mineralising, this combination and the close association of uranium mineralization.
U metallogeny hydrothermal alteration presents certain rule and spatial zonation feature on spatial, has obvious horizontal and vertical and divides band feature.Alkalescence alteration, acid alteration often superposition form rich ore.
3. the identification of vein in late period
Late period is acid, intermediate-basic dike is close with uranium ore time-space relationship, for the important recognition marks in one-tenth ore deposit.Phase mountain ore field acidity vein is mainly Granodiorite mass, and intermediate-basic dike is mainly lamprophyre, diabase vein.Acid vein has close spatial relationship with uranium ore, indicates this district to possess good uranium ore enrichment place；Lamprophyre veins and U metallogeny have close time, space and genetic relationship, and indication vein near zone possesses metallogenic period Tectono-magmatic-fluid activity.
Wherein uranium deposit space orientation formula and forecast model:
By to Xiangshan volcanic basin uranium ore key ore control factor, one-tenth ore deposit recognition marks and uranium ore space distribution rule, having divided Volcanic-type Hydrothermal Uranium Deposit space orientation formula, constructed Volcanic-type Hydrothermal Uranium Deposit Prognosis of Blind Ore location model.
1. uranium ore space orientation formula
According to uranium ore and rift structure, slump structure, substrate interface and late period the crucial ore control factor spatial relationship such as vein, each for Xiangshan volcanic basin mineral deposit uranium ore space orientation formula is divided into 5 kinds of fundamental types: rift structure location formula, rift structure and slump structure compound location formula, rift structure and substrate interface compound position formula, rift structure and late period vein compound position formula and rift structure and explosion breccia pipe compound positions formula.Same mineral deposit is likely the compound of above-mentioned multiple space orientation formula, and multiple space orientation formula is compounded to form big ore deposit, rich ore.
2. forecast model
Mineral deposit (ore body) component of forecast is proposed: region Fault dissecting basin constructs, secondary structure, and interface superposition Gravitational sliding structure between volcanic basin group, substrate interface superposition volcano rift structure, volcano interlayer are from opening structure according to uranium ore key ore control factor；Acidic rock (granite porphyry) normal pulse mafic rocks (lamprophyre, diabase) arteries and veins was concentrated and was grown late period；Rift structure and volcanic basin group boundary, the folded superimposed structure compound of substrate interface；Uranium mineralization is correlated with alteration type, mineral assemblage, element combinations, and acid (based on hydromicazation) alteration superposes with alkaline alteration (based on albitization)；Have been found that uranium mineralization；Ground Geophysical-chemical is abnormal.
By synthesis identifying technique such as geology, physical prospecting, change spies, uranium deposit (ore body) component of forecast is comprehensively identified；By uranium deposit (ore body) component of forecast identification, uranium ore particularly deep blind ore is positioned prediction.Finally construct phase mountain volcanic type U-ore Prognosis of Blind Ore location model, as shown in Figure 1.
The wherein identification technical method combination of component of forecast:
According to supporting complex arts such as Volcanic-type Hydrothermal Uranium Deposit Prognosis of Blind Ore location model, applied geology, physical prospecting, change spies, component of forecast is identified, according to different Target area, dissimilar uranium ore space orientation formulas, deep blind ore is carried out integrated forecasting.
1. geological technique
Application Field Geology Investigations, probing, lab analysis integrated approach, identify metallogenic period rift structure；Find out interface, substrate interface between volcanic basin group, and the Gravitational sliding structure of superposition, volcano rift structure, volcano interlayer are from opening a structural feature；Find out acidic rock in late period (granite porphyry) normal pulse mafic rocks (lamprophyre, diabase) arteries and veins development characteristics；Find out rift structure and volcanic basin group boundary, substrate interface superimposion position；Find out uranium mineralization acidity alteration, alkalescence metamorphic gold deposit and distribution characteristics thereof and U metallogeny coherent element assemblage characteristic.
Alkalescence altered mineral is combined as receives Anhydrite-bloodstone-chlorite-carbonate；Acid altered mineral is combined as fluorite-illite (illite/smectite mixed layer)-chlorite.Alkalescence alteration element combinations is Na, Al, U, Zr, Sc；Acid alteration element combinations is P, Ca, U, Mo, Sr, Zr, Th, W, HREE.
2. geophysical prospecting technology
Application Audio Magnetotelluric Souding method, (the general resistivity of dellenite is at 300～4000 Ω m to differentiate various lithology by the difference of lithology resistivity, metamorphic rock resistivity is at 200～10000 Ω m, and broken speckle rhyolite resistivity is at 1000～10000 Ω m)；By interface, substrate interface between change in resistance gradient zone identification volcanic basin group；Detection of run-out structure is changed by resistivity transversal inhomogeneity, the degree of depth by the depth discrimination laser cutting of resistivity transversal inhomogeneity change impact, differentiated the scale of fractured zones by the scope (identical lithology resistivity relative reduction) affected, the relative country rock of component in fault structure zone resistivity generally can reduce by 1～2 order of magnitude.
Application Audio Magnetotelluric Souding and high-precision magnetic survey method combine, and are changed by resistivity transversal inhomogeneity, magnetic field gradient band, demarcation line, magnetic field, changing of the relative positions position, magnetic field, magnetic field a string of bead anomaly, identify different stage rift structure.Utilizing magnetic survey curve to divide rift structure, it is judged that fracture tendency, rift structure is wide, slow abnormal in tendency direction.
Application Anomaly recognition daughter measurement, gamma-ray spectrometry method, delineation Anomaly recognition is abnormal, gamma-ray spectrometry is abnormal.The normal district of local area (dead area) radon concentration is 6000Bq/m3Left and right, adopts average to add 3 times of mean square deviation (15789Bq/m3), as radon anomalies lower limit.
3. geochemical exploration technique
Applied geochemistry method, studies the geochemical elements distribution characteristics of structural belt, and delineation structural belt U metallogeny coherent element is abnormal, and (alkalescence alteration element combinations is Na, Al, U, Zr, Sc；Acid alteration element combinations is P, Ca, U, Mo, Sr, Zr, Th, W, HREE).
Utilize the ground method such as electrogeochemistry, uranium component detection uranium, Polymetallic Mineralization abnormal information, draw a circle to approve uranium exceptions area.U, Mo, Th, Pb, Zn, Cu be ground electricity extract mainly look for ore deposit element combinations.It is 1.5～2.5 × 10 that ground electricity extracts the background value of uranium content-6, 4～8 × 10 can reached containing position, ore deposit-6, adopt CA fractal method to divide threshold, the anomaly contrast value that the position containing ore deposit shows as abnormal width little reaches as high as more than 3.
Embodiment 2
The present embodiment and embodiment 1 are distinctive in that:
The present embodiment is high in the clouds-trip mill-water distribution granite porphyry body target prospecting area embodiment.
Within 2010～2011 years, visit integrated approach be predicted this district evaluating by geology, physical prospecting, change, drawn a circle to approve high in the clouds-trip mill-water distribution granite porphyry body target prospecting area.This district's NW trending Granodiorite mass is grown, and fractured alteration zone grown by Granodiorite mass northeast contact band, NE trending fault structure cutting Granodiorite mass.The Granodiorite mass contact cranny development redness alkali with both sides is handed over, superposition hydromicazation, and tool gamma, uranium content are higher or abnormal.
According to crucial ore control factor and minerogentic condition Further Division Beneficial Ore-forming position: NW trending Granodiorite mass, east northeast are to shoal-trip mill fracture belt, particularly the contact of NW trending Granodiorite mass northeast is with and constructs compound position with NE trending fault, as shown in Figure 2.
Within 2012, probing verification is implemented in target prospecting area stage casing by 261 teams, it has been found that fairly large uranium ore, and uranium ore body is composed and is stored near Granodiorite mass northeast contact band.This target area is expected to develop into east northeast to metallogenic belt, currently this metallogenic belt is carried out comprehensive exploration prospecting.
(1) high in the clouds-trip mill-water distribution granite porphyry body target prospecting area Beneficial Ore-forming condition
High in the clouds-trip mill-water distribution granite porphyry body target prospecting area is positioned at Granodiorite mass and volcanic rock Contact Boundary, east northeast is grown to, northwestward faults, contact band in Granodiorite mass northeast is grown for structurally fractured zone and hydrothermal alteration, gamma, uranium content are higher, have U metallogeny hydrothermal alteration mineral assemblage and geochemical elements combination；Between group, interface change is strong；Physical prospecting display laser cutting is relatively deep, has radon gas High-Field；Change to visit and show that tool geo-electrochemistry extraction uranium, thorium are abnormal, possess Beneficial Ore-forming condition.Granite porphyry northeast contact band and be the most favored site of U metallogeny with the NE trending fault structure position that crosses, NE trending fault structure and secondary cranny band thereof are also the favourable space of U metallogeny.
Emphasis looks for position, ore deposit to be Granodiorite mass northeast contact zone structure alteration rock band.
(2) the pre-flow gauge of target prospecting area uranium ore space orientation
High in the clouds-trip mill-water distribution granite porphyry body target prospecting area uranium ore space orientation prediction, is first pass through Analysis of Metallogenetic Conditions, it was predicted that select major tasks district；Visit integrated approach again through geology, physical prospecting, change emphasis working area is evaluated, draw a circle to approve target prospecting area；Finally by drilling project, target prospecting area is carried out uranium ore verification.Idiographic flow is as follows:
1. crossing uranium ore key ore control factor, metallogenic geologic features research, find out that NW trending granite porphyry body is grown in Xiangshan volcanic basin northeast, east northeast is to the growth of shoal-trip mill fracture belt compound, it has been found that uranium mineralization point, selects this district to attach most importance to working area, as shown in Figure 2.
2. emphasis working area is carried out the investigation of large scale uranium Beneficial Ore-forming condition matter, structural belt hydrothermal alteration mineral assemblage, geochemical elements assemblage characteristic in district are identified, study.
Contact band in Granodiorite mass northeast and find Nw-trending Tectonics crushed zone, see strong hydromicazation, carbonation, and uranium content is higher；Severely-weathered Mafic Dikes seen by contact band northeastward；Contacting band in granite porphyry southwest and grow red highly basic explanation, strong yellow green hydromicazation along the secondary cranny of NE trending fault, uranium content is higher, as shown in table 1, Fig. 3；Uranium mineralization alterated rocks altered mineral combines: alkalescence altered mineral is combined as receives Anhydrite-bloodstone-chlorite-carbonate, and acid altered mineral is combined as fluorite-illite (illite/smectite mixed layer)-chlorite, as shown in table 2；Uranium mineralization alterated rocks element combinations: alkalescence alteration element combinations is Na, Al, U, Zr, Sc, acid alteration element combinations is P, Ca, U, Mo, Sr, Zr, Th, W, HREE.
Table 1 high in the clouds-trip mill-water distribution area altered rock Partial Elements is containing scale
Table 2 high in the clouds-trip mill-water distribution area altered rock clay analyzes result table
Note: S: montmorillonite；I/S: mixed-layer illite-montmorillonite；I: illite；K: kaolinite；C: chlorite；C/S: chlorite montmorillonite mixes layer；I/S%: Iraq/Mongolia mixes layer, mixed layer ratio；C/S%: green/to deceive people layer, mixed layer ratio.
Uranium mineralization point is seen in Granodiorite mass both sides.Showing that granite porphyry contact band superposes position with rift structure crushed zone is favourable Ore-hosting space.Granodiorite mass northeast contact zone structure alteration zone is most Beneficial Ore-forming position.
3. utilize Audio Magnetotelluric Souding, high-precision magnetic survey Combination of Methods, to Structural Characteristics of Cenozioc Faulted Structure in district (scale, produce turn, extend the degree of depth), basin style feature (between group interface, substrate interface) and late period Characteristics of Veins be identified, study；In conjunction with borehole data, the rift structure of authorized strength work district larger proportion chi, late period vein scattergram and group between interface, substrate interface bathymetric map, set up interface, substrate interface between working area structure, group and three dimensions geological model that late period, vein was constituted.
Physical prospecting AMT (V8) and high-precision magnetic survey demonstrate volcanic basin the north and there is a NS structure (original volcano rift structure) with metamorphic rock substrate contact band, and outside this survey line, inner side all there is rift structure, metamorphic rock substrate sillar pushes away and is overlying on volcano rock stratum, as shown in fig. 4 a；There is a Nw-trending Fault Structures with volcanic rock contact site in Granodiorite mass northeast, as shown in Figure 4 b, laser cutting is deeper.Audio Magnetotelluric Souding result map shows, between this district's group, burial depth of the boundary is relatively big, the strong steepening in interface between group between Porphyry Bodies and northern basement outcrops metamorphic rock.
4. utilizing Soil Radon and daughter measurement, ray spectrometric survey Combination of Methods that working area carries out large scale surface sweeping work, delineation Soil Radon, gamma-ray spectrometry are abnormal, extract structural belt U metallogeny information.
Anomaly recognition transient measurement shows, radon anomalies is distributed mainly on the upper and lower contact band of Granodiorite mass, contact the structurally fractured zone found with geologic survey to match with Granodiorite mass northeast, as it is shown in figure 5, shoal-trip mill fracture and secondary cranny thereof are also distributed radon anomalies.
5. utilize geo-electrochemistry method, the distribution characteristics of working area U metallogeny coherent element is identified, studies, draw a circle to approve U metallogeny coherent element Abnormal Map, extract structural belt U metallogeny information.
It is abnormal substantially that geo-electrochemistry measures display U metallogeny coherent element, there is strong ground electricity extraction uranium abnormal, as shown in Figure 6 in granite porphyry northern border and Granodiorite mass.
6. the U metallogeny information such as comprehensive geology, physical prospecting, change spy, carries out uranium ore overall merit, has drawn a circle to approve high in the clouds-trip mill-water distribution granite porphyry target prospecting area, as shown in Figure 7 working area.Speculate that this district uranium ore is composed to deposit space type to be mainly fracture compound with vein；Deep exists that interface between fracture and group is compound and fracture is compound with substrate interface, but due to two interface depths relatively greatly, investigate do not bore and.Prediction uranium ore is positioned NW trending granite porphyry northeast contact zone structure alteration zone with east northeast to shoal-rift structure compound position, trip mill.
7. verification is drilled
Target prospecting area stage casing (location, You Fang village) was carried out first stage probing in 2012 to investigate, 261 teams disclose fairly large industry uranium ore near the contact zone structure alteration rock band of Granodiorite mass northeast, represent shown in boring uranium mineralization such as Fig. 7,8,9, industry ore body cumulative thickness 7.14～14.53 meters, grade 0.071%～0.136%, uranium ore body is strictly controlled by NW trending Granodiorite mass northeast contact zone structure alteration zone, and this east northeast is expected to develop into the peripheral new U metallogeny band of phase mountain ore field to mine belt.At present, preliminry basic research, to this target prospecting area Northwest Section, In The Southeast Section extension, is expected to continue expansion and looks for ore deposit achievement.
Above in conjunction with drawings and Examples, the present invention is explained in detail, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, it is also possible under the premise without departing from present inventive concept, make various change.The content not being described in detail in the present invention all can adopt prior art.
Claims (5)
1. a volcanic type U-ore blind ore space orientation technique, it is characterized in that: the pre-flow gauge of uranium ore space orientation includes primary election major tasks district, the crucial identification of ore control factor, uranium ore space orientation formula and the structure of forecast model, the identification technical method combination of component of forecast, probing verification, specifically includes following steps:
Step one, according to uranium ore uranium formation conditions, crucial ore control factor, carries out region uranium metallogenic prognosis, primary election major tasks district；
Emphasis working area is carried out large scale geologic survey by step 2, structural altered zone is identified, studies；Structural belt hydrothermal alteration zone hydrothermal alteration mineral assemblage, geochemical elements assemblage characteristic are identified, study；
Step 3 utilizes Audio Magnetotelluric Souding, high-precision magnetic survey Combination of Methods, to Structural Characteristics of Cenozioc Faulted Structure in district, basin style feature and late period Characteristics of Veins be identified, study；In conjunction with borehole data, the rift structure of authorized strength work district larger proportion chi, late period vein scattergram, interface, substrate interface bathymetric map between group；Set up the three dimensions geological model that working area is made up of interface, substrate interface and vein between rift structure, group；
Step 4 utilizes radon and daughter measurement, ray spectrometric survey Combination of Methods that working area carries out large scale surface sweeping work, draws a circle to approve radon, gamma-ray spectrometry Abnormal Map, extracts U metallogeny information；
Step 5 land used electrochemical method is measured and is analyzed, and the distribution characteristics of working area U metallogeny coherent element is studied, and draws a circle to approve U metallogeny coherent element Abnormal Map, extracts structural belt uranium-many Metals Deposit Ores information；
Step 6 comprehensive geology, physical prospecting, change are made inquiries about breath, working area is carried out integrated forecasting, deep blind ore is effectively positioned；
Step 7 probing verification.
2. a kind of volcanic type U-ore blind ore space orientation technique according to claim 1, it is characterised in that: the identification of described crucial ore control factor include the identification of Ore-control fault structure, U metallogeny hydrothermal alteration identification and late period vein identification.
3. a kind of volcanic type U-ore blind ore space orientation technique according to claim 1 and 2, it is characterised in that: described Ore-control fault structure be identified by areal geology, Use of Geophysical Data is comprehensively analyzed, it is determined that ore-controlling structure；The identification of described U metallogeny hydrothermal alteration determines that acid alteration and alkalescence alteration overlapping control the space orientation of big ore deposit rich ore, identifies the best metamorphic gold deposit of mineralising；Described late period, the identification of vein included the identification of acidic rock normal pulse intermediate-basic dike in late period.
4. a kind of volcanic type U-ore blind ore space orientation technique according to claim 1 and 2, it is characterised in that: the identification technical method combination of described component of forecast, including geological technique, geophysical prospecting technology and geochemical exploration technique.
5. a kind of volcanic type U-ore blind ore space orientation technique according to claim 4, it is characterised in that:
Described geological technique is application Field Geology Investigations, probing, lab analysis integrated approach, identify metallogenic period rift structure, include ascertaining that interface, substrate interface between volcanic basin group, and the Gravitational sliding structure of superposition, volcano rift structure, volcano interlayer are from opening a structural feature；Find out acidic rock normal pulse intermediate-basic dike development characteristics in late period；Find out rift structure and volcanic basin group boundary, substrate interface superimposion position；Find out uranium mineralization acidity alteration, alkalescence metamorphic gold deposit and distribution characteristics thereof and U metallogeny coherent element assemblage characteristic；
Described geophysical prospecting technology combines for application Audio Magnetotelluric Souding and high-precision magnetic survey method, is changed by resistivity transversal inhomogeneity, magnetic field gradient band, demarcation line, magnetic field, changing of the relative positions position, magnetic field, magnetic field a string of bead anomaly, identifies different stage rift structure；
Described geochemical exploration technique is applied geochemistry method, and the geochemical elements distribution characteristics of structural belt is studied, and delineation structural belt U metallogeny coherent element is abnormal.
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