Method for analyzing hydrogen isotope in water of fluid inclusion

Abstract

The invention discloses a method for analyzing a hydrogen isotope in water of fluid inclusion. According to the method, a water sampling instrument and a TC / EA (Temperature Conversion / Elemental Analyzer)-IRMS device are utilized; the water sampling instrument comprises a vacuum communication pipeline, a sample cracking device and a water sample collecting device, the water sample collecting device comprises a quartz collecting tube, and a capillary tube part is formed at the lower end of the quartz collecting tube; the TC / EA-IRMS device comprises a TC / EA and an IRMS, and the TC / EA comprises a high-temperature reaction tube and a gas-phase chromatographic column. With the capillary tube part and a solid feeding manner, the quantity of required samples is small, and thus the quantity of samples of the fluid inclusion can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of stable isotope analysis, in particular to a hydrogen isotope analysis method in fluid inclusion water. Background technique [0002] Fluid inclusions refer to one or more fluid inclusions that are filled and sealed in tiny holes, fissures or intergranules of minerals by rock-forming ore-forming fluids (gas-liquid-containing fluids or silicate melts) during the growth of mineral crystallization. A phase state substance (liquid, gas or solid), which has been sealed in the main mineral since its formation and has a phase boundary with the main mineral. Since the determination of the isotope composition of fluid inclusions (sometimes referred to as inclusions or inclusions) can provide unique information for the study of diagenetic and mineralization theory, paleoclimate and paleotemperature reconstruction, gemstone mine exploration, gemstone identification, etc. It has been developed rapidly and widely used...

AI Technical Summary

Problems solved by technology

For conventional hydrogen isotope analysis in inclusion water, in order to achieve satisfactory isotope ratio analysis results (such as the signal peak intensity of mass spectrometry samples), the amount of water required for testing is generally about 2-10uL when liquid samples are injected (that is, it is necessary to collect 2 ~10uL water sample), at this time, at least 3g of sample (for example, 3~10g) is required, which puts forward higher requirements for mineral separation. In the actual mineral separation, inclusion samples often cannot be selected from 3g samples, and the hydrogen produced in this way It is less, when entering the IRMS mass spectrometry detection, the measured isotope ratio is often inaccurate due to the low signal of the sample

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