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A method for limestone re-os isotope dating

An isotope, re-os technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of low accuracy and precision of test results, time-consuming analysis and testing, low test success rate, etc. The effect of thorough reaction and shortened reaction time

Active Publication Date: 2020-11-13
NAT RESERACH CENT OF GEOANALYSIS
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Problems solved by technology

[0009] In view of the above-mentioned analysis, the present invention aims to provide a method for limestone Re-Os isotope dating to solve the problems of unscientific sampling, low test success rate, low accuracy and precision of test results, analysis and test methods in existing test methods. time consuming problem

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  • A method for limestone re-os isotope dating

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[0060] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0061] A specific embodiment of the present invention discloses a method for limestone Re-Os isotope dating, such as figure 1 The flowchart shown includes the following steps:

[0062] Step 1: Limestone sample collection and crushing.

[0063] (1) Limestone sample collection

[0064] In order to ensure the accuracy of limestone dating, the collection of limestone samples must meet certain conditions, as follows: the collected limestone samples are syn-sedimentary or nearly syn-sedimentary, so as to ensure that the limestone samples have the same initial ratio of Os and ensure a higher age p...

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Abstract

The invention relates to a method for dating the isotope of limestone Re-Os, and belongs to the technical field of isotope geochronology. The problems that the sampling method is unscientific, the dating samples are blindly selected, the success rate of dating is low, the sample digestion is incomplete and takes a long time, and the impurity interference caused by a dissolution scheme causes the poor accuracy and precision of the limestone Re-Os isotope age results. The method comprises the following steps: collecting a limestone sample and crushing the sample; selecting a limestone dating sample deposited in a reducing environment; pre-digesting the limestone dating sample, and dissolving a pre-digesting solution of the limestone dating sample with a mixed solution of hydrochloric acid and hydrogen peroxide; separating and purifying a dissolution solution Re-Os of the limestone dating sample; performing the Re-Os isotope thermal ionization mass spectrometry; processing the Re-Os isotope data to obtain the final limestone Re-Os isotopic age. The analysis method provided by the invention has the advantages of improving the success rate, accuracy, precision and the operation efficiency of the experimental process of the limestone Re-Os isotope dating.

Description

technical field [0001] The invention relates to the technical field of isotope geochronology, in particular to a method for limestone Re-Os isotope dating. Background technique [0002] As one of the earliest geological disciplines, stratigraphy is the foundational basic discipline of geological science. Among them, the accurate determination of the age of limestone sedimentary strata is of great significance to the study of stratigraphy. At present, the accurate determination of the sedimentary age of limestone strata mainly adopts the U-Pb method to determine the age of zircon in the limestone stratum condensate interlayer, and indirectly calculates the age of each limestone layer through the deposition rate. Although the age obtained by the zircon U-Pb method has high precision and small error, tuff or bentonite interlayers are rarely found in many limestone formations, and it is difficult to find zircons, which cannot provide an accurate time scale for biostratigraphy ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/626
Inventor 赵鸿屈文俊李超周利敏李欣尉
Owner NAT RESERACH CENT OF GEOANALYSIS
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