CN-116337913-B - Submarine jet hydrothermal participation method in process of judging black rock formation

CN116337913BCN 116337913 BCN116337913 BCN 116337913BCN-116337913-B

Abstract

The invention relates to the technical field of uranium ores, in particular to a submarine jet hydrothermal participation method in the process of judging the formation of black rock, which comprises the following steps of step 1, collecting black rock samples; step 2, sample preparation, analysis and test, step 3, black rock sample scanning electron microscope observation, step 4, biological hot water action judgment, and step 5, isotope tracing judgment. The invention combines modern element content testing means, isotope tracing means, biological hot water distinguishing means and traditional geological work, extracts key elements, establishes a procedural distinguishing basis, and judges whether the black rock system of the target area has submarine jet hot liquid participation, thereby improving the prospecting efficiency in the black rock system, reducing large-scale construction investigation and saving cost and time.

Inventors

WANG JIAN
WANG ZHENYUN
WANG WENQUAN
LI ZHIXING

Assignees

核工业北京地质研究院

Dates

Publication Date: 20260512
Application Date: 20221230

Claims (1)

1. A submarine jet hydrothermal participation method in the process of judging black rock formation is characterized by comprising the following steps: Step 1, collecting a black rock sample; Step 2, sample preparation and analysis test; step 3, observing a black rock sample by a scanning electron microscope; step 4, judging the action of the biological hot water; Step 5, isotope tracing judgment; the step 1, the black rock sample collection comprises the steps of selecting a black rock stratum needing to be judged, collecting a rock sample with the weight of more than or equal to 500g from bottom to top in a thickness of 3cm in a direction perpendicular to the black rock stratum, wherein the sample needs to be collected on a new exposure surface of the rock so as to ensure that the rock sample does not suffer from serious weathering; Step 2, sample preparation and analysis testing, including: Step 2.1, slicing the sample obtained in the step 1 to prepare optical sheets with the thickness of 0.3mm, preparing at least 2 optical sheets for each sample, and keeping the rest part of each sample slice for subsequent operation for continuous use; 2.2, crushing the rest part of each sample slice in the step 2.1 to 200 meshes; step 2.3, taking 50 g of sample powder from each sample, and measuring the content of Ba element in each sample by using a plasma mass spectrometer; Step 2.4, taking 50 g of sample powder from each sample, measuring the contents of SiO 2 and Al 2 O 3 of the sample powder by using an X-ray fluorescence spectrometer, and calculating the respective SiO 2 /Al 2 O 3 ratio of each sample according to the measurement result; Step 2.5, isotope determination, namely taking 50 g of sample powder from each sample, and determining delta 13 C isotope in each sample by using a MAT-253 gas isotope mass spectrometer; The step 3, black rock sample scanning electron microscope observation comprises the steps of carrying out mapping operation on the light sheet manufactured in the step 2.1 by using a scanning electron microscope, carrying out surface scanning observation on two elements of Se and Ir, and dividing the observed Se and Ir element into A groups, wherein the two elements of Se and Ir can be divided into A groups only by observing any one or two elements, and the record of not observing the two elements is B groups; Judging biological hot water effect, namely judging the sample of the group A in the step 3, wherein the ratio of the Ba element content to the SiO 2 /Al 2 O 3 of each sample obtained by testing and calculating in the step 2 is needed, selecting the sample with the Ba content more than or equal to 500 multiplied by 10 -6 and the SiO 2 /Al 2 O 3 ratio more than or equal to 4.5 in the sample of the group A to be divided into the group I, and dividing the rest sample into the group II, wherein the black rock system of the sample collection area of the group I can be judged to have the participation of the submarine jet flow hot water effect in the deposition forming process, so that the sample of the group II has extremely high uranium polymetallic ore forming potential; Judging the samples in the group B in the step 3, and dividing the samples in the group B into the group III for standby as long as the samples meet one of the Ba content of more than or equal to 500 multiplied by 10 -6 or the SiO 2 /Al 2 O 3 ratio of more than or equal to 4.5, if the Ba content in the samples is less than 500 multiplied by 10 -6 and the SiO 2 /Al 2 O 3 ratio is less than 4.5, dividing the samples into the group IV, and simultaneously judging that the black rock system of the sample collecting area of the group IV has no participation of submarine jet hydrothermal action in the process of deposition formation, so that the prospecting value is very low; and 5, judging the isotope tracking, wherein the judging comprises the following steps: The isotope values obtained in the step 2 are needed to be used for carrying out isotope tracing judgment on the group II and group III samples in the step 4, and the samples of which the delta 13 C is more than or equal to 8.9 per mill in the group II and group III are selected to be divided into the group V, and the rest samples are divided into the group VI, so that the participation of the submarine jet hydrothermal effect of the black rock system in the sample collection area of the group V in the deposition forming process can be obtained according to the judgment, and the method has extremely high ore forming value; the black rock system of the VI group sample collection area has no participation of the submarine jet hydrothermal effect in the deposition formation process, and has low prospecting value, so that the follow-up work is not needed.

Description

Submarine jet hydrothermal participation method in process of judging black rock formation Technical Field The invention relates to the technical field of uranium ores, in particular to a submarine jet hydrothermal participation method in a process of judging black rock system diagenetic. Background The black rock system is the most important occurrence rock of rare metals, nonmetal and oil and gas energy in the world, and is the important strategic resource of China, namely three rare elements, which is the essential vitamin in national defense industry and national development, but the black rock system is very widely distributed from North America to European and Asian, and is in large-area strip distribution in areas such as Guizhou, qinghai, hunan, jiangxi, xinjiang, tibet, zhejiang and the like in China, but the black rock system with uranium polymetallic mineral potential is relatively less, the black rock system with uranium polymetallic mineral potential must have an important premise that the black rock system has the participation of submarine jet hot liquid in the process of forming rocks, because elements such as platinum elements, rare earth elements, phosphorus, vanadium, nickel, molybdenum, uranium and the like in the deep part of the earth can be brought into the shallow part of the earth through hot liquid to precipitate and crystallize in the black rock system to form mineral resources, Therefore, a method for judging whether submarine jet hydrothermal solution participates in the process of forming the black rock system is needed to be designed, so that the technical efficiency of rapidly screening the black rock system with uranium polymetallic ore forming potential in the prior art is improved. Disclosure of Invention The invention designs a submarine jet hydrothermal participation method in the process of judging the formation of a black rock system, which is used for solving the technical problems of improving the prospecting efficiency in the black rock system, reducing large-scale construction investigation and saving the prospecting cost and time. The technical scheme of the invention is as follows: A submarine jet hydrothermal participation method in the process of judging black rock formation comprises the following steps: Step 1, collecting a black rock sample; Step 2, sample preparation and analysis test; step 3, observing a black rock sample by a scanning electron microscope; step 4, judging the action of the biological hot water; And 5, isotope tracking judgment. The method for judging whether the black rock is formed into a rock or not according to claim 1, wherein the step 1 of collecting the black rock sample comprises the steps of selecting a black rock stratum to be judged, collecting a rock sample with a weight of 500 g or more from bottom to top in a thickness of 3cm in a direction perpendicular to the layer of the black rock, wherein the sample is collected on a new exposed surface of the rock, so as to ensure that the rock sample does not suffer from serious weathering. Step 2, sample preparation and analysis testing, including: Step 2.1, slicing the sample obtained in the step 1 to prepare optical sheets with the thickness of 0.3mm, preparing at least 2 optical sheets for each sample, and keeping the rest part of each sample slice for subsequent operation for continuous use; 2.2, crushing the rest part of each sample slice in the step 2.1 to 200 meshes; step 2.3, taking 50 g of sample powder from each sample, and measuring the content of Ba element in each sample by using a plasma mass spectrometer; Step 2.4, taking 50g of sample powder from each sample, measuring the contents of SiO2 and Al2O3 of the sample by using an X-ray fluorescence spectrometer, and calculating the respective SiO2/Al2O3 ratio of each sample according to the measurement result; and 2.5, isotope determination, namely taking 50 grams of sample powder for each sample, and determining delta 13C isotope in each sample by using a MAT-253 gas isotope mass spectrometer. The step 3 of black rock sample scanning electron microscope observation comprises the steps of carrying out mapping operation on the light sheet manufactured in the step 2.1 by using a scanning electron microscope, carrying out surface scanning observation on two elements of Se and Ir, and dividing the observed element containing Se and Ir into A groups, wherein the two elements of Se and Ir can be divided into A groups only by observing any one or two elements, and the record of not observing the two elements is B groups. And 4, judging the action of the biological hot water, wherein the step comprises the following steps: Judging the group A samples in the step 3, wherein the Ba element content and the SiO2/Al2O3 ratio of each sample obtained by testing and calculating in the step 2 are required to be used, and selecting samples with the Ba content of more than or equal to 500 multiplied by 10 < -6 > and the SiO2/Al2O3 ratio of mor