Novel method for testing fluid inclusion in minerals

Abstract

The invention discloses a novel method for testing fluid inclusion in minerals, and relates to the technical field of the testing of fluid inclusion in rock minerals and the microbeam analysis of rock minerals. The method comprises the following steps: knocking off a small fragment from a tested sample; enabling the sample to be clamped on a sample support; enabling the sample and the sample support to be installed on a vacuum transmission device; placing liquid nitrogen in a paper cup till a half of the paper cup is filled; enabling the paper cup with the liquid nitrogen to be placed in a quick freezing workbench; enabling the vacuum transmission device provided with the sample and the sample support to be connected with the quick freezing workbench, and carrying out vacuum pumping till liquid nitrogen is shaped like mud; enabling the vacuum transmission device after freezing and vacuum pumping to be connected with a pre-freezing processing room, and carrying out the vacuum pumping of the pre-freezing processing room; cutting the sample in the pre-freezing processing room through a cutting knife on the device; and enabling the coated sample to be conveyed onto a cold bench, matched with the sample, in an SEM testing room. The method enlarges the application range of scanning electron microscopes and freezing transmission equipment, is good in application prospect, and is of great significance to the research of fluid inclusion.

Description

Technical field: [0001] The invention relates to the technical field of fluid inclusion testing in rock minerals and microbeam analysis of rock minerals, in particular to a method for testing fluid inclusions in minerals. Background technique: [0002] Fluid inclusions are ubiquitous in mineral crystals, and they are formed simultaneously with host minerals. Fluid inclusions in minerals are rock-forming ore-forming fluids (gas-liquid-containing fluids or silicate melts) that are wrapped in mineral lattice defects or cavities during the mineral crystal growth process and are still sealed and preserved in the main minerals. That part of the material that has a phase boundary with the host mineral. Fluid inclusions are therefore relics of the original ore-forming, diagenetic solutions or magmatic melts. By studying fluid inclusions, reliable data can be provided for solving some geological problems. The study of mineral fluid inclusions was originally mainly used in the stud...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a novel method for testing fluid inclusions in minerals, which uses scanning electron microscope (including tungsten filament and field emission scanning electron microscope) + cryotransfer equipment + energy spectrometer to effectively solve the problem of scanning electron microscope + The energy spectrometer can detect the loss of fluid and its daughter minerals when testing fluid inclusions, making it easier to find the target object. It is suitable for observing the shape of fluid inclusions, and can directly measure the liquid phase, gas phase composition and daughter mineral composition in the frozen state. It is especially effective for unidentified or less than 1-2μm and opaque sub-minerals under the optical microscope, to determine its type and chemical composition, and can also be used to study fluid inclusions in opaque minerals (metallic minerals), while expanding scanning electron microscopy and cryotransmission The application field of the equipment has broad prospects and is of great significance to improving the research level of fluid inclusions