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Graphite Re-Os isotope dating method

An isotope and re-os technology, which is applied in the preparation, sampling, and instrumentation of test samples, can solve the problems of low accuracy and precision of test results, unscientific sampling of test methods, and incomplete dissolution of graphite samples. Experimental test time, low cost, and the effect of increasing the success rate

Pending Publication Date: 2022-05-17
NAT RESERACH CENT OF GEOANALYSIS
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Problems solved by technology

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides a method for graphite Re-Os isotope dating to solve the problem of unscientific sampling, incomplete dissolution of graphite samples, and poor test results in existing test methods. Low accuracy and precision, time-consuming analysis and testing

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  • Graphite Re-Os isotope dating method
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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] Such as figure 1 As shown, the present invention provides a method for graphite Re-Os isotopic dating, and the dating method mainly includes the following steps:

[0048] Step 1: Graphite sample collection, crushing and weighing.

[0049] (1) Graphite sample collection.

[0050] In order to ensure the accuracy of graphite dating, the collection of graphite samples must meet certain conditions, as follows:

[0051] Graphite samples usually have three occurrences: 1) massive ore in thermal contact metamorphic graphite ore; 2) disseminated scale-like ore in gneiss-type ore; 3) lumpy graphite in felsic vein. For massive ore, take a graphite sample every 1m in the same ore layer, take 6-8 graphite samples, each graphit...

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Abstract

The invention provides a graphite Re-Os isotope dating method, belongs to the technical field of isotope geochronology, and solves the problems of poor graphite Re-Os isotope age result accuracy and precision and the like caused by incomplete dissolution of Re-Os in a graphite sample in the prior art. The method comprises the following steps: collecting different types of graphite samples, crushing the samples, and weighing the samples; the method comprises the following steps: primarily measuring the content of Re-Os in a graphite sample, and dissolving the graphite dating sample by using an HNO3-H2SO4-HClO4 mixed solution; separating and purifying the dissolving solution Re-Os of the graphite dating sample; carrying out Re-Os isotope thermal ionization mass spectrometry detection; and processing the Re-Os isotope data to obtain the final graphite Re-Os isotope age. The analysis method provided by the invention improves the accuracy and precision of the graphite Re-Os isotope dating result and the operation efficiency of the experimental process.

Description

technical field [0001] The invention belongs to the technical field of isotope geochronology, in particular to a method for graphite Re-Os isotope dating. Background technique [0002] Graphite is a product of special geological processes and an important raw material for the development of emerging industries. It has always been an indispensable and important strategic resource in the development of military industry and high, new and cutting-edge technologies. There are many types of graphite deposits in my country, with a wide distribution range, and the degree of development and utilization varies greatly. It is of great significance to carry out the chronological research on the metallogenic regularity of metamorphic graphite deposits in my country to enrich the research on metallogenic theory. Re and Os are elements with high siderophilicity and organophilicity, and are relatively enriched in metal sulfides and mechanism-rich sedimentary rocks. Therefore, Re-Os isotop...

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Application Information

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IPC IPC(8): G01N27/626G01N1/38G01N1/40G01N1/44
CPCG01N27/626G01N1/4022G01N1/4044G01N1/4055G01N1/44G01N1/38G01N2001/4027G01N2001/388G01N2001/4033
Inventor 李超赵鸿屈文俊周利敏李欣尉
Owner NAT RESERACH CENT OF GEOANALYSIS