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A Method for Analyzing the Initial Value of Sedimentary Rock os

An analytical method and technology for sedimentary rocks, applied in the analysis of materials, material analysis by electromagnetic means, material analysis using wave/particle radiation, etc. Improve the success rate, shorten the experiment time, and simplify the experiment process

Active Publication Date: 2021-02-26
NAT RESERACH CENT OF GEOANALYSIS
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Problems solved by technology

[0004] In view of the above analysis, the present invention provides an analysis method for the initial value of Os in sedimentary rocks, which is used to solve the problems of long time-consuming, low success rate and high cost of analysis and testing in obtaining the initial value of Os in sedimentary rocks

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  • A Method for Analyzing the Initial Value of Sedimentary Rock os
  • A Method for Analyzing the Initial Value of Sedimentary Rock os
  • A Method for Analyzing the Initial Value of Sedimentary Rock os

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[0044] 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.

[0045] A specific embodiment of the present invention discloses a method for analyzing the initial value of Os in sedimentary rocks. The method mainly includes collecting sedimentary rock samples, making rock thin sections, target positioning for rock thin section analysis, and LA-MC-ICP-MS laser in situ ablation Five steps of Os isotope testing and data processing of authigenic pyrite, such as Figure 4 shown. The specific analysis steps are as follows:

[0046] Step 1: Sedimentary Rock Sample Collection

[0047] First, determine the target stratum level, collect sedimentary rock samples a...

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Abstract

The invention relates to an analysis method for the initial value of Os in sedimentary rocks, belongs to the technical field of isotope geochemical analysis, and solves the problems in the prior art that it takes a long time to obtain the initial value of Os in sedimentary rocks, the success rate is low, and the cost of analysis and testing is high. The analysis method includes the following steps: collecting sedimentary rock samples; making rock thin sections; establishing a rectangular coordinate system on the rock thin sections, determining the quadrant and rectangular coordinates of the analysis target under the backscattered image of the scanning electron microscope, and positioning the rock thin section analysis targets ;According to the Cartesian coordinate system, the quadrant of the analysis target and the Cartesian coordinates of the analysis target, the position of the analysis target is determined again under the LA‑MC‑ICP‑MS optical lens, and LA‑MC‑ICP‑MS laser in situ ablation of authigenic yellow iron is carried out Mine Os isotope test, M / Z185, M / Z187, M / Z188 signal data were measured; the signal data were processed to obtain the initial value of sedimentary rock Os. This method can directly and quickly obtain the initial value of Os in sedimentary rocks.

Description

technical field [0001] The invention relates to the technical field of isotope geochemical analysis, in particular to an analysis method for the initial value of Os in sedimentary rocks. Background technique [0002] Re and Os are moderately incompatible and strongly compatible elements, respectively. In the differentiation of the earth's crust and mantle, Os tends to enrich in the mantle, and Re tends to enrich in the crust. Therefore, the Re-Os isotope system, as a powerful tool for tracing sedimentary rock samples, has been widely used by geologists at home and abroad. The Re-Os in sedimentary rocks such as black shale, limestone, and mudstone mainly come from seawater, and the initial value of Os ( 187 Os / 188 Os) is the Os isotope characteristic of seawater during deposition. There are three main supply routes for Os in seawater: highly radioactive Os in the continental crust ( 187 Os / 188 Os is generally greater than 1), Os of non-radioactive origin in submarine h...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2251G01N27/62
CPCG01N23/2251G01N27/62
Inventor 赵鸿屈文俊赵九江李超周利敏李欣尉
Owner NAT RESERACH CENT OF GEOANALYSIS
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