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Method for measuring thorium lead age of bastnaesite sample on basis of secondary ion mass spectrometer

A technology of bastnaesite and secondary ions, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as large age errors of bastnaesite

Active Publication Date: 2016-05-04
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, although the existing laser ablation inductively coupled plasma mass spectrometry (that is, the determination of the uranium-lead age of bastnaesite) can determine the age of bastnaesite on a small scale, but due to the high thorium content of bastnaesite (Th), and the content of uranium (U) is relatively low, so the error of the existing method to measure the age of bastnaesite is relatively large

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  • Method for measuring thorium lead age of bastnaesite sample on basis of secondary ion mass spectrometer
  • Method for measuring thorium lead age of bastnaesite sample on basis of secondary ion mass spectrometer
  • Method for measuring thorium lead age of bastnaesite sample on basis of secondary ion mass spectrometer

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[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on this The embodiments in the invention, and all other embodiments obtained by persons of ordinary skill in the art without creative effort, all belong to the scope of protection of the present invention.

[0038] To avoid the disadvantages of isotope dilution thermal ionization mass spectrometry (ID-TIMS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) in order to be able to accurately determine the age of bastnaesite at smaller scales, the method in this disclosure It is a method for determining the age of bastnaesite thorium lead based on secondary ion mass spectrometer developed by secondary ion mass spectrometer.

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Abstract

The invention discloses a method for measuring the thorium lead age of a bastnaesite sample on the basis of a secondary ion mass spectrometer. The method includes the steps of embedding the bastnaesite sample and a bastnaesite standard substance in epoxy resin to form a sample target, placing the sample target in a sample cavity of the secondary ion mass spectrometer, using an oxygen plasma ion source, focusing the oxygen plasma ion source to the bastnaesite sample on the sample target in the form of parallel light so that secondary ions of the bastnaesite sample can be generated, making the secondary ions of the bastnaesite sample pass through an electric field and a magnetic field in the secondary ion mass spectrometer so that the angle and the speed can both be focused on an ion signal detection system, detecting the original thorium lead ratio in the secondary ions of the bastnaesite sample through the ion signal detection system, correcting the original thorium lead ratio to obtain the corrected thorium lead ratio, and calculating the thorium lead age of the bastnaesite sample through the corrected thorium lead ratio.

Description

technical field [0001] The invention relates to the field of geochemistry, in particular to a method for determining the thorium-lead age of a bastnaesite sample based on a secondary ion mass spectrometer. Background technique [0002] Bastnaesite REE (CO 3 )F.CaCO 3 It is a light rare earth carbonate mineral, which is an important rare earth resource. In order to better develop and utilize this resource, it is necessary to have a deep understanding of its geological origin. The age of its formation is an important factor. Accurately obtaining the metallogenic age is a prerequisite for studying the metallogenic background and comparing known geological events. [0003] The international dating methods for bastnaesite include isotope dilution thermal ionization mass spectrometry (ID-TIMS) (document 1: Sal'nikova et al., Bastnaesite: A Promising U–Pb Geochronological Tool, 2010) and laser ablation inductively coupled plasma mass spectrometry (LA -ICPMS) (Document 2: Yang e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 凌潇潇李秋立李献华刘宇唐国强
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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