CN111044515A - Method for identifying favorable sections of hydrothermal uranium ore mineralization - Google Patents
Method for identifying favorable sections of hydrothermal uranium ore mineralization Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention belongs to the technical field of uranium ore geology and resource evaluation, and particularly relates to a method for identifying favorable sections of hydrothermal uranium ore mineralization. The method comprises the following steps: step 1, finding out geological background of an exploration area; step 2, observing and dividing the alteration in the field; step 3, sampling and grinding under-mirror observation; step 4, judging altered mineral combination; and 5, identifying favorable sections of the mine. The method is designed based on the combination characteristics of the altered minerals, can identify favorable sections of uranium deposit mineralization through the combination characteristics of the altered minerals, provides an idea for evaluation of uranium ore exploration prospects, provides a specific direction for actual ore exploration work, is simple and convenient to operate, reduces prediction blindness, and shortens evaluation time.
Description
Technical Field
The invention belongs to the technical field of uranium ore geology and resource evaluation, and particularly relates to a method for identifying favorable sections of hydrothermal uranium ore mineralization.
Background
Hydrothermal alteration is a process of rock composition and physicochemical characteristic changes caused by hydrothermal activity of rock slurry, and from the viewpoint of mineral origin, alterations of different properties can reflect the hydrothermal or fluid environment formed by the alterations. The method has an important indication effect on ore exploration of hydrothermal uranium deposit. The evolution process of a hydrothermal or fluid environment in the formation of the uranium ore can be reflected by utilizing the combination characteristics of the altered minerals, so that the favorable section of the ore formation can be judged. Therefore, a method for identifying favorable sections of the hydrothermal uranium deposit by using altered mineral combination characteristics needs to be designed, research on identifying favorable sections of the hydrothermal uranium deposit is carried out, and the method has important practical significance for identifying favorable sections of the uranium deposit and predicting mineral-forming scenic spots.
Disclosure of Invention
The invention aims to provide a method for identifying favorable sections of hydrothermal uranium ore mineralization, which is used for solving the technical problems of long prediction and evaluation time, poor positioning accuracy and low identification degree in the prior art for identifying favorable sections of hydrothermal uranium ore mineralization.
The technical scheme of the invention comprises the following steps:
a method of identifying favorable zones of hydrothermal uranium ore mineralization, comprising the steps of:
step 1, finding out geological background of an exploration area;
step 2, observing and dividing the alteration in the field;
step 3, sampling and grinding under-mirror observation;
step 4, judging altered mineral combination;
and 5, identifying favorable sections of the mine.
The step 1 of ascertaining the geological background of the exploration area comprises the following steps: information such as regional structure characteristics, exposed stratum characteristics, magma characteristics and the like.
And in the step 2, the alteration is observed and divided in the field, wherein the alteration division comprises the following steps: the red sodium feldspar and the hematite are subjected to alkaline alteration; grayish black, purple black fluoridized, hydromicated to acid alteration.
And 3, the step of observing under the sampling lapping lens further comprises the steps of collecting an altered sample, grinding the sample into a sheet with the thickness of 0.03cm and the thickness of 2.4 multiplied by 2.4cm, and observing the altered mineral combination by using a polarization microscope and installing a 5-time ocular lens and a 10-time objective lens.
The step 4 further comprises: combining field observation of alteration characteristics and further observing alteration minerals under a microscope, and accurately judging the combination of the alteration minerals, wherein the alkali alteration minerals have the combination characteristics of albite-hematite-chlorite-carbonate; the acid altered minerals have the combined characteristics of fluorite-hydromica-chlorite.
The step 5 further comprises: and if the change mineral combination characteristics in the step 4 appear in the exploration area, identifying the favorable section of the mineral formation.
The invention has the beneficial technical effects that:
(1) the method is simple and convenient to operate, reduces the blindness of prediction, and shortens the evaluation time.
(2) The method is designed based on the combination characteristics of the altered minerals, can identify favorable sections of uranium deposit mineralization through the combination characteristics of the altered minerals, provides ideas for evaluation of uranium deposit exploration prospects, provides specific directions for actual prospecting work, and has wide popularization and application prospects.
Drawings
FIG. 1 is a flow chart of a method for identifying favorable ore formation sections of a hydrothermal uranium ore by changing mineral combination characteristics;
FIG. 2 is an alkali altered zone of an investigation region according to an embodiment of the present invention;
FIG. 3 is an acid altered zone of an investigation region according to an embodiment of the present invention;
FIG. 4 is an alkaline mineralization alteration micrograph of an ore deposit in an exploration area in an embodiment of the present invention;
FIG. 5 is a micrograph of the acid mineralization alteration of the mineral deposit in the exploration area in an example of the present invention.
Detailed Description
The technical scheme of the method for identifying the advantageous section of the hot type uranium ore mineralization is further described with reference to the attached drawings and the embodiment, and the method comprises the following steps:
step 1, finding out geological background of an exploration area;
step 2, observing and dividing the alteration in the field;
step 3, sampling and grinding under-mirror observation;
step 4, judging altered mineral combination;
and 5, identifying favorable sections of the mine.
The geological background of the exploration area is determined in the step 1 as described above and includes information such as regional structure characteristics, exposed stratum characteristics, and rock characteristics.
Observing the compartmentalized alteration in the field in the step 2, wherein the red sodium feldspar and the hematite are changed into alkaline alteration; grayish black, purple black fluoridized, hydromicated to acid alteration.
The divided alterations were observed in the field in step 3 as described above, and an altered sample was collected, the sample size was 3X 6X 9cm, the area of the sample was defined by a marker pen, the sample was ground into a 2.4X 2.4cm thick sheet, and the altered mineral composition was observed by mounting a 5-fold eyepiece and a 10-fold objective lens on the sheet using a polarization microscope.
In the step 4, the combination of the outdoor observation of the alteration characteristics and the further observation of the alteration minerals under a mirror is combined, the combination of the alteration minerals is accurately judged, and the alkali alteration minerals have the combination characteristics of albite, hematite, chlorite and carbonate; the acid altered minerals have the combined characteristics of fluorite-hydromica-chlorite.
The exploration area in step 5 as described above presents the altered mineral composition characteristics in step 4 as a favorable segment of mineralization.
Example (b): the present invention will be further described in detail by taking the example of identifying the altered mineral combination characteristics of a particular facies mountain exploration area as a favorable mining area.
Step 1: ascertaining geological background of investigation region
The mountain land structure of a certain region is positioned at the north edge of the China plate near the collision butt joint zone of the China plate and the lappet plate, and the regional structure pattern is positioned at the intersection of the deep fracture of the China east Germany-tunneling river and the deep fracture of the China east Yihuang-Anyuan, at the southwest end of the famous Ganghang structure volcanic rock zone and the intersection of the Ganghang structure volcanic rock uranium ore zone and the Guangshan-various granite uranium ore zones.
The geological exploration area is located in the west middle of the facies mountain, the river source is far from the east, the volcanic collapse structure from the middle of the facies mountain basin is closer, and the geological exploration area is mainly controlled by a northern east China-stone cave fracture zone and a secondary fracture structure thereof in the west of the facies mountain. The basement is middle primitive ancient metamorphic rock, and the cover is the volcanic rock system of the top group of the chalk system and the goose lake ridge group. The exposed stratum mainly comprises broken scholar streak rock at the upper part of the lower chalkiness system goose lake ridge group, medium primitive ancient shallow metamorphic biotite schist, sandstone and glutenite at the lower section of the lower chalkiness system goose lake ridge group, conglomerate in a fusion manner by a glutenite clamp, and flow streak imperial rock at the upper section of the lower chalkiness system ridge group.
Step 2: compartmentalized lesions observed in the field
In a Zhoushan exploration area, alkaline alteration and acidic alteration are found in the area, and alkaline alteration zones of red sodium long petrifaction and red iron mineralization are found, as shown in figure 2, the alkaline alteration mineralization of red in the crushed rocky rhyolitic rocks are strictly distributed along two sides of a crack;
fig. 3 shows acid alteration zones of grayish black, purple black fluorate and hydromication, wherein in a, grayish black strong hydromication and chlorite mineralization fragmentation zones are obvious in alteration zones; and b, in the crushing zone, the purple black fluorite, the strong hydromication and the green mud petrochemical structure are extruded, the two sides of the crushing zone have obvious alteration zonation, and the crushing zone is an area where alkaline and acidic alterations simultaneously occur.
And step 3: microscopic observation of sampling abrasive disc
Collecting an alteration sample in an investigation region, wherein the size of the sample is 3 multiplied by 6 multiplied by 9cm, a marking pen is used for delimiting the flaking range, the sample is ground into a sheet with the thickness of 0.03cm and 2.4 multiplied by 2.4cm, a polarizing microscope is utilized, a 5-time eyepiece and a 10-time objective lens are installed, and microscopic images of alkaline alteration minerals such as albite, hematite, chlorite and carbonate are observed under the microscope, as shown in figure 4, wherein the surface of albite is strongly mineralized by hematite, and lime green chlorite is filled in cracks; developing carbonation and green mud petrifaction in the medium alkali-substitution rock;
the acid alteration minerals comprise fluorite, hydromica and chlorite under the observation of a lens, as shown in figure 5, wherein purple colloidal and annular fluorite and vein-like uranium minerals in a are closely symbiotic; b, the hydromica produced in a scaly or collective shape; c, the strongly developed green mud petrochemical is polluted green to black green and is produced as a pulse-shaped microcrystal aggregate.
And 4, step 4: determining altered mineral composition
The characteristic of the altered zonation is observed in the field and the altered minerals are further observed under a mirror, and the combination characteristic of the alkaline altered minerals, namely albite-hematite-chlorite-carbonate, is judged; acid altered mineral composition characterized by fluorite-hydromica-chlorite.
And 5: identifying favorable zones of mineralization
The exploration area has albite-hematite-chlorite-carbonate; the fluorite-hydromica-chlorite alteration mineral combination is characterized in that the mineral combination is a favorable section for mineral formation.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The invention also has important reference significance for positioning other ore kind hydrothermal deposit.
Claims (6)
1. A method for identifying favorable sections of hydrothermal uranium ore mineralization is characterized by comprising the following steps: the method comprises the following steps:
step 1, finding out geological background of an exploration area;
step 2, observing and dividing the alteration in the field;
step 3, sampling and grinding under-mirror observation;
step 4, judging altered mineral combination;
and 5, identifying favorable sections of the mine.
2. The method of identifying favorable segments of hydrothermal uranium ore mineralization according to claim 1, wherein: the step 1 of ascertaining the geological background of the exploration area comprises the following steps: information such as regional structure characteristics, exposed stratum characteristics, magma characteristics and the like.
3. The method of identifying favorable segments of hydrothermal uranium ore mineralization according to claim 2, wherein: and in the step 2, the alteration is observed and divided in the field, wherein the alteration division comprises the following steps: the red sodium feldspar and the hematite are subjected to alkaline alteration; grayish black, purple black fluoridized, hydromicated to acid alteration.
4. A method of identifying favorable segments of hydrothermal uranium ore mineralization according to claim 3, wherein: and 3, the step of observing under the sampling lapping lens further comprises the steps of collecting an altered sample, grinding the sample into a sheet with the thickness of 0.03cm and the thickness of 2.4 multiplied by 2.4cm, and observing the altered mineral combination by using a polarization microscope and installing a 5-time ocular lens and a 10-time objective lens.
5. The method of identifying favorable segments of hydrothermal uranium ore mineralization according to claim 1, wherein: the step 4 further comprises: combining field observation of alteration characteristics and further observing alteration minerals under a microscope, and accurately judging the combination of the alteration minerals, wherein the alkali alteration minerals have the combination characteristics of albite-hematite-chlorite-carbonate; the acid altered minerals have the combined characteristics of fluorite-hydromica-chlorite.
6. The method of identifying favorable segments of hydrothermal uranium ore mineralization according to claim 1, wherein: the step 5 further comprises: and if the change mineral combination characteristics in the step 4 appear in the exploration area, identifying the favorable section of the mineral formation.
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Cited By (3)
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| CN112799142A (en) * | 2020-12-30 | 2021-05-14 | 核工业北京地质研究院 | Mineral combination prediction method for uranium, molybdenum and lead multi-metal mineralization |
| CN113406723A (en) * | 2021-06-07 | 2021-09-17 | 核工业北京地质研究院 | Evaluation method for deep mineralization potential of volcanic rock type uranium ore |
| CN113933260A (en) * | 2021-09-15 | 2022-01-14 | 核工业北京地质研究院 | Identification method of hydrothermal uranium deposit fluid activity center |
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Application publication date: 20200421 |