A method of simultaneously analyzing the 'water' content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry

A technology of secondary ion mass spectrometry and oxygen isotope, which is applied in the field of mineral composition analysis, can solve the problems of limited, non-zircon particle water content analysis, and unrealized wide application, so as to improve the analysis accuracy, reduce the detection limit, improve the The effect of vacuum

Active Publication Date: 2018-05-15
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

Turner et al. (2015) have used the large-scale ion probe SHRIMP SI to carry out water content testing research on silicate glass and nominally anhydrous minerals such as pyroxene and olivine, but limited by the vacuum level of the sample chamber, its The detection limit is only 20-40ppm, which is higher t

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  • A method of simultaneously analyzing the 'water' content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry
  • A method of simultaneously analyzing the 'water' content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry
  • A method of simultaneously analyzing the 'water' content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry

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[0029] The following is a further description of the present invention, rather than a limitation of the present invention.

[0030] In order to improve the spatial resolution of the “water” content analysis of nominally anhydrous minerals, realize the analysis of the “water” content of zircon minerals by large-scale magnetic mass spectrometry, in order to obtain more abundant geochemical information in zircons, the method in this disclosure It is based on the large-scale secondary ion mass spectrometer CAMECA IMS 1280-HR to simultaneously analyze the "water" content and oxygen isotope in zircon.

[0031] The selected single minerals ZG2, ZG3, ZG4, and 91500 were used as standard samples, and Penglai, Qinghu and Plesovices were used as samples to stick them on the double-sided adhesive tape in order, and the sample target (diameter 25.4mm, thickness 5mm.

[0032] The method of making the sample target can refer to the following steps:

[0033]Paste the double-sided tape on th...

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Abstract

A method of simultaneously analyzing the 'water' content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry is disclosed. The method is based on baking in an instrumentsystem and baking and air exhausting by a circulating titanium pump to reduce an internal background value of an instrument as far as possible, a target made of an alloy material is adopted to reduceimpurity gas introduced from the outside, and liquid nitrogen refrigeration is adopted as assist, and therefore the vacuum degree of a sample cavity is greatly increased, the lower limit of detectionis effectively reduced, and the analysis precision is increased. Based on a high spatial resolution characteristic of a large-scale secondary ion mass spectrometer, microcell in-situ simultaneous analysis of the 'water' content and the oxygen isotope for small zircon particles and other nominally anhydrous minerals is achieved.

Description

Technical field: [0001] The invention relates to the technical field of mineral composition analysis, in particular to a method for simultaneous micro-area in-situ quantitative analysis of "water" content and oxygen isotope in zircon based on large-scale secondary ion mass spectrometry. Background technique: [0002] Nominally anhydrous minerals refer to minerals that do not contain H in the ideal chemical formula, such as olivine, pyroxene, zircon, garnet, and feldspar, but many experiments have shown that their structures contain H, and generally point defects form into mineral crystals. In the earth science community, all H-containing phases are collectively referred to as "water"-containing phases. Because the existence of microstructure "water" will have a very significant impact on the physical and chemical properties of minerals and even rocks, the importance of its absolute content measurement has been widely recognized by the earth science community and has receive...

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Application Information

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IPC IPC(8): G01N27/62G01N1/36G01N1/44
CPCG01N1/36G01N1/44G01N27/62
Inventor 张万峰夏小平杨晴张彦强熊伯琴
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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