CN109580498B - Geological identification method for ore-bearing interlayer oxidation zone of sandstone-type uranium ore - Google Patents
Geological identification method for ore-bearing interlayer oxidation zone of sandstone-type uranium ore Download PDFInfo
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Abstract
The invention belongs to the field of uranium ore mineralization theory and ore finding technical methods, and particularly relates to a sandstone-type uranium ore interbedded oxidation zone geological identification method, which comprises the following steps: step one, identifying an oxidation zone; step two, preliminarily judging the oxidation degree; entering a third step, and continuing to identify; if the degree of oxidation is lower, the mineralization is lower, and the recognition is terminated; step three, collecting a sample; collecting an interlayer oxidation zone sandstone sample; step four, mineralogy identification; grinding a sample into a thin slice, observing the alteration decomposition condition of uranium-containing minerals under an optical microscope, and if the alteration decomposition condition of the uranium-containing minerals occurs, carrying out interlayer oxidation zone ore-containing; fifthly, geochemical identification; and (3) testing the composition of trace elements in the sample, analyzing the migration of the elements such as U, V, Mo, Re, Se and the like, and if the elements all have migration phenomena, determining that the interlayer oxidation zone contains ores.
Description
Technical Field
The invention belongs to the field of uranium ore mineralization theory and an ore finding method, and particularly relates to a sandstone-type uranium ore-containing interlaminar oxidation zone geological identification method.
Background
The oxidation zone is an important identification mark of sandstone-type uranium mineralization in the sedimentary basin, and the interlayer oxidation zone is formed by migration of underground water in middle sandstone of an upper water-resisting layer and a lower water-resisting layer. Since typical interlayer oxidation zone sandstone-type uranium deposit in the basin belongs to a post-oxidation formation, namely, oxygen-containing uranium-containing water on the earth surface permeates into a primary reductive ore-containing layer, the original gray ore-containing layer is oxidized into oxidation change zones such as brownish red, brownish yellow and yellow. The oxidation zone is an important mark for searching sandstone-type uranium ores in an interlayer oxidation zone. However, not all interbed oxidation zones are mineralized, and if the interbed oxidation zone develops later, the uranium in the groundwater does not undergo sufficient water-rock reaction to precipitate, and the interbed oxidation zone is mineralized weakly or is not mineralized. The previous man subdivided the oxidation zone into a complete oxidation zone, an incomplete oxidation zone, an oxidation-reduction transition zone and a primary zone according to the colour, mineralogical and geochemical characteristics of the oxidative alterations. From these characteristics, the interlaminar oxidation zone can be identified, but it cannot be judged whether the interlaminar oxidation zone is ore-bearing. Therefore, the establishment of a set of method for identifying the ore-containing interlayer oxidation zone of the sandstone-type uranium ore has important significance for the ore exploration of the sandstone-type uranium ore in the basin.
Disclosure of Invention
The invention aims to improve the geological identification precision of an ore-containing interlayer oxidation zone and provide an effective method for identifying the ore-containing interlayer oxidation zone aiming at the problem of whether the interlayer oxidation zone contains ore or not.
The technical scheme adopted by the invention is as follows:
a sandstone-type uranium ore interbedded oxidation zone geological identification method comprises the following steps:
step one, identifying an oxidation zone;
identifying whether the sand body developing the oxidation zone has an upper water-resisting layer and a lower water-resisting layer at the same time, if so, the oxidation zone is an interlayer oxidation zone, entering the second step, and continuing to identify; if not, the oxide band between layers cannot be regarded as the oxidation band between layers, and the recognition is terminated;
step two, preliminarily judging the oxidation degree;
judging the oxidation degree from the aspects of color, carbon residue organic matter content and oxidation zone development scale, if the oxidation degree is higher, the oxidation zone possibly contains ore, entering the third step, and continuing to identify; if the degree of oxidation is lower, the mineralization is lower, and the recognition is terminated;
step three, collecting a sample;
collecting an interlayer oxidation zone sandstone sample;
step four, mineral identification
Grinding a sample into a thin slice, observing the alteration decomposition condition of uranium-containing minerals under an optical microscope, and if the alteration decomposition condition of the uranium-containing minerals occurs, carrying out interlayer oxidation zone ore-containing;
step five, geochemical identification
And (3) testing the composition of trace elements in the sample, analyzing the migration of the elements such as U, V, Mo, Re, Se and the like, and if the elements all have migration phenomena, determining that the interlayer oxidation zone contains ores.
In the first step, the lithology of the upper and lower water-resisting layers can be impervious or weakly permeable layers such as mudstone, coal beds and the like.
The basis for judging the oxidation degree in the second step is as follows:
the strong oxidation color is purple red and brick red, does not contain carbon dust organic matters, and has the length of 1-nx10 kilometers;
the weak oxidation color is yellow and gray yellow, the carbon chip-containing organic matter has the length: 1-n × 10 m.
At least 2 samples are collected at the same position in the third step, and the weight of each sample is not less than 200 g; one sample was used for milling the flakes and the other sample was used for trace element testing.
In the fourth step, the thickness of the thin sheet is required to be ground to 0.03 mm.
In the fifth step, the sample is firstly crushed to 200 meshes, and the content of the trace elements in the sample is tested by ICP-MS.
The invention has the beneficial effects that: the method can evaluate the mineralization of the found oxidation zone, effectively guide uranium ore exploration and improve the purpose and success rate of uranium ore exploration.
Drawings
Fig. 1 is a flow chart of a geological identification method for an ore-bearing interlayer oxidation zone of a sandstone-type uranium ore provided by the invention;
figure 2 shows the hydrolysis pattern of uranium containing cuttings.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
A sandstone-type uranium ore interbedded oxidation zone geological identification method comprises the following steps:
step one, identifying an oxidation zone;
identifying whether the sand body developing the oxidation zone has an upper water-resisting layer and a lower water-resisting layer at the same time, if so, the oxidation zone is an interlayer oxidation zone, entering the second step, and continuing to identify; if not, the oxide band between layers cannot be regarded as the oxidation band between layers, and the recognition is terminated;
step two, preliminarily judging the oxidation degree;
judging the oxidation degree from the aspects of color, carbon residue organic matter content and oxidation zone development scale, if the oxidation degree is higher, the oxidation zone possibly contains ore, entering the third step, and continuing to identify; if the degree of oxidation is lower, the mineralization is lower, and the recognition is terminated;
step three, collecting a sample;
collecting an interlayer oxidation zone sandstone sample;
step four, mineral identification
Grinding a sample into a thin slice, observing the alteration decomposition condition of uranium-containing minerals under an optical microscope, and if the alteration decomposition condition of the uranium-containing minerals occurs, carrying out interlayer oxidation zone ore-containing;
step five, geochemical identification
And (3) testing the composition of trace elements in the sample, analyzing the migration of the elements such as U, V, Mo, Re, Se and the like, and if the elements all have migration phenomena, determining that the interlayer oxidation zone contains ores.
In the first step, the lithology of the upper and lower water-resisting layers can be impervious or weakly permeable layers such as mudstone, coal beds and the like.
The basis for judging the oxidation degree in the second step is as follows:
the strong oxidation color is purple red and brick red, does not contain carbon dust organic matters, and has the length of 1-nx10 kilometers;
the weak oxidation color is yellow and gray yellow, the carbon chip-containing organic matter has the length: 1-n × 10 m.
At least 2 samples are collected at the same position in the third step, and the weight of each sample is not less than 200 g; one sample was used for milling the flakes and the other sample was used for trace element testing.
In the fourth step, the thickness of the thin sheet is required to be ground to 0.03 mm.
In the fifth step, the sample is firstly crushed to 200 meshes, and the content of the trace elements in the sample is tested by ICP-MS.
As shown in fig. 1, the geological identification method for the ore-bearing interlayer oxidation zone of the sandstone-type uranium ore provided by the invention comprises the following steps:
(1) identification of oxidation bands
And identifying whether the sand body of the developing oxidation zone has an upper water-resisting layer and a lower water-resisting layer at the same time, wherein the lithology of the water-resisting layers can be impermeable or weakly permeable layers such as mudstone and coal beds. If the upper and lower water-resisting layers exist at the same time, the oxidation zone is an interlayer oxidation zone, and the second step is carried out to continue the identification; if not, the oxide band between layers cannot be regarded as the oxidation band between layers, and the recognition is terminated.
(2) Preliminary discrimination of degree of oxidation
The oxidation degree was judged from the color, the organic matter content of carbon dust and the scale of development of the oxidation zone, and the judgment was made as shown in the following table.
If the oxidation degree is higher, the oxidation zone possibly contains ore, and the oxidation zone enters a third part to continue to be identified; if the degree of oxidation is low, the mineralization is low, and the recognition is terminated.
(3) Collecting samples
And (3) collecting interlayer oxidation zone sandstone samples, wherein at least 2 samples are collected at the same position, and the weight of each sample is not less than 200 g. One sample was used for milling the flakes and the other sample was used for trace element testing.
(4) Mineralogy identification
Grinding the sample into thin slices, grinding the thin slices to the thickness of 0.03mm, observing the alteration decomposition condition of the uranium-containing minerals under an optical microscope, and if the alteration decomposition condition of the uranium-containing minerals occurs, carrying out ore-containing in interlayer oxidation zones.
(5) Geochemical identification
The sample was first crushed to 200 mesh and tested for trace element content by ICP-MS. Then, migration of elements such as U, V, Mo, Re, Se and the like is analyzed, and if migration of the elements occurs, the interlayer oxidation zone contains minerals.
Example 1 application example of identification of mineralization of oxidized zone of the ore deposit of the gulf uranium of the south edge of the Ili basin
The method for identifying the mineralization of the oxidation zone of the uranium deposit of the south Mongolian of the Ili basin by utilizing the method comprises the following specific steps:
(1) identification of oxidation zone of Mongolian uranium deposit
The oxidized sand body of the Mongolian Gou uranium deposit is clamped between an upper coal seam and a lower coal seam, so that the oxidation zone in the area is an interlayer oxidation zone.
(2) And preliminarily judging the oxidation degree.
And (3) observing the oxidation zone rocks of the Mongolian Golgi deposit, preliminarily judging that the oxidation zone is a strong oxidation zone, and judging according to the following table:
(3) collecting samples
Samples of an interlaminar oxidation zone at 3 positions of Mongolian uranium deposit are collected, 2 samples are collected at each position, and the weight of each sample exceeds 200 g. One sample was used for milling the flakes and the other sample was used for trace element testing.
(4) Mineralogy identification
The sample is ground into a sheet with the thickness of 0.03mm, and the uranium-containing mineral alteration decomposition condition is observed under an optical microscope, so that the granite debris and the biotite debris are hydrolyzed (figure 2), and the interlayer oxidation zone has high mineralization performance.
(5) Geochemical identification
The sample was first crushed to 200 mesh and tested for trace element content by ICP-MS. Compared with unoxidized rock, elements such as U, V, Mo, Re, Se and the like have strong migration phenomena (Table 1). It follows that the interlaminar oxidation zone in which the gulf deposits develop is mineralised.
TABLE 1 table of the oxidation zone element content of the gulf uranium deposit
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (5)
1. A sandstone-type uranium ore interbedded oxidation zone geological identification method is characterized by comprising the following steps: the method comprises the following steps:
step one, identifying an oxidation zone;
identifying whether the sand body developing the oxidation zone has an upper water-resisting layer and a lower water-resisting layer at the same time, if so, the oxidation zone is an interlayer oxidation zone, entering the second step, and continuing to identify; if not, the oxide band between layers cannot be regarded as the oxidation band between layers, and the recognition is terminated;
step two, preliminarily judging the oxidation degree;
judging the oxidation degree from the aspects of color, carbon residue organic matter content and oxidation zone development scale, if the oxidation degree is higher, the oxidation zone possibly contains ore, entering the third step, and continuing to identify; if the degree of oxidation is lower, the mineralization is lower, and the recognition is terminated;
step three, collecting a sample;
collecting interlayer oxidation zone sandstone samples, wherein at least 2 samples at the same position are collected, and the weight of each sample is not less than 200 g; one sample was used for milling the wafer and the other sample was used for trace element testing;
step four, mineral identification
Grinding a sample into a thin slice, observing the alteration decomposition condition of uranium-containing minerals under an optical microscope, and if the alteration decomposition condition of the uranium-containing minerals occurs, carrying out interlayer oxidation zone ore-containing;
step five, geochemical identification
And (3) testing the composition of trace elements in the sample, analyzing the migration of the elements such as U, V, Mo, Re, Se and the like, and if the elements all have migration phenomena, determining that the interlayer oxidation zone contains ores.
2. The geological identification method for the ore-bearing interbed oxidation zone of the sandstone-type uranium ore according to claim 1, wherein the geological identification method comprises the following steps: in the first step, the lithology of the upper and lower water-resisting layers can be impervious or weakly permeable layers such as mudstone, coal beds and the like.
3. The geological identification method for the ore-bearing interlaminar oxidation zone of the sandstone-type uranium ore according to claim 1 or 2, wherein the geological identification method comprises the following steps: the basis for judging the oxidation degree in the second step is as follows:
the strong oxidation color is purple red and brick red, does not contain carbon dust organic matters, and has the length of 1-nx10 kilometers;
the weak oxidation color is yellow and gray yellow, the carbon chip-containing organic matter has the length: 1-n × 10 m.
4. The geological identification method for the ore-bearing interbed oxidation zone of the sandstone-type uranium ore according to claim 1, wherein the geological identification method comprises the following steps: in the fourth step, the thickness of the thin sheet is required to be ground to 0.03 mm.
5. The geological identification method for the ore-bearing interbed oxidation zone of the sandstone-type uranium ore according to claim 1, wherein the geological identification method comprises the following steps: in the fifth step, the sample is firstly crushed to 200 meshes, and the content of the trace elements in the sample is tested by ICP-MS.
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| CN114397422B (en) * | 2021-12-14 | 2024-02-09 | 核工业北京地质研究院 | Method for calculating element mobility in sandstone type uranium deposit clay mineral formation process |
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