Multipoint Sampling Isochron Dating Method of Uranium-bearing Veins

Abstract

The invention belongs to the technical field of geology, and concretely relates to a uranium-containing vein multipoint sampling isochrone dating method in order to accurately obtain the dating test object. The method is characterized in that according the different mineralization types, the ore is cut and grinded to a polished sheet, the uranium-containing vein with different mineralization stages and types can be divided, a micro drill is used for multi-point sampling on the uranium-containing vein, U and Pb isotopic content of the sample is analyzed, and an isochrone processing method is used for processing data to obtain the uranium mineralization age. The method also can avoid the influence of impure sample or contaminated sample to the age data, and is suitable for dating mineralization of the different mineralization types and uranium minerals.

Description

technical field [0001] The invention belongs to the field of geological technology, and relates to a technology for studying the metallogenic age of hydrothermal uranium deposits, in particular to a multi-point sampling isochron dating method for uranium-containing veins, which aims at minerals associated with uranium mineralization in different stages , more accurately determine the age of mineralization. Background technique [0002] At present, the technology adopted for the metallogenic age of hydrothermal uranium deposits is mainly to use uranium minerals or ores containing uranium minerals to analyze the uranium content and lead isotope composition, and then obtain the model age or model age of uranium minerals or ores through data processing. isochrone age. Commonly used dating minerals include pitchblende and crystalline uranium ore. The main steps of this technology include taking samples of different types of ores in the field, indoor selection of crystalline ura...

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Problems solved by technology

[0005] (3) During the mineral selection process, samples from different phases are easily confused

[0006] (4) Since uranium-containing single minerals often exist in the ore in the form of dissemination, the selected minerals often contain pyrite, galena and other joint crystals. These minerals often contain high Pb content, because this Pb does not belong to The daughter body Pb produced by the parent body U will cause the value of the mineralization age calculated by the model age method to be too high

[0007] (5) The U-Pb isotope model age is often used in data processing. Since the three model ages of the same sample are different, the model metallogenic ages obtained from different samples of the same deposit are also different, so the obtained metallogenic ages are often It is a range with large changes, so it is difficult to accurately determine the metallogenic age and divide the metallogenic periods, and sometimes there are even conflicts between the metallogenic age data and geological phenomena

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