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Cathode luminescence imaging method of monazite

A cathodoluminescence and imaging method technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of long analysis time, no direct correlation, and low spatial resolution

Inactive Publication Date: 2018-02-23
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

X-ray Mapping can reflect the composition information of the internal structure of monazite to a certain extent, but its analysis time is too long (calculated in hours) and the spatial resolution is low; BSE (backscattered electron imaging) image analysis can quickly image, but its It reflects the comprehensive contrast information of the elements contained in monazite, and there is no direct correlation between image features and internal structural features
If the internal structural characteristics of the dating monazite are not clear, it will not be able to effectively guide the selection of the location of the dating analysis, and may even cause wrong interpretation of the chronological results

Method used

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  • Cathode luminescence imaging method of monazite
  • Cathode luminescence imaging method of monazite

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Embodiment example 1

[0082] Granite sample: monazite particles are selected and imaged according to the imaging method provided by the present invention, and the processed monazite resin target is pasted and fixed on the sample stage of the FEI NovananoSEM450 scanning electron microscope with double-sided carbon conductive adhesive to obtain high-resolution The cathodoluminescence image, the clear internal structure shows the characteristics of magmatic monazite in the rhythmic oscillation zone; SIMS monazite U-Pb dating results are consistent with the magmatic zircon dating results. Therefore, the imaging method provided by the embodiment of the present invention effectively guides the dating work of magmatic monazite.

Embodiment example 2

[0084] Metamorphic granulite sample: select monazite particles, perform imaging according to the imaging method provided by the present invention, and paste and fix the processed monazite resin target on the sample stage of FEI NovananoSEM450 scanning electron microscope with double-sided carbon conductive adhesive, which can High-resolution cathodoluminescence images were obtained, and the metamorphic monazite characteristics of multi-stage core-edge structure were clearly visible; SIMS monazite U-Pb dating was performed on the core and edge respectively, and the ages were close, which indicated that the crust had gone through a The process of rapid lifting. Therefore, the imaging method provided by the embodiment of the present invention can make a reasonable and appropriate interpretation of geological events in the dating work of monazite.

[0085] Therefore, the cathodoluminescence imaging method of monazite provided in the embodiment of the present invention uses a field...

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Abstract

The invention discloses a cathode luminescence imaging method of monazite, which comprises: making a target for monazite mineral particles to obtain a resin target; polishing the resin target to expose the monazite to the resin target; Coating the monazite of the above-mentioned resin target, with the coated surface facing up, and fixing the coated resin target on the sample stage of the field emission scanning electron microscope with conductive glue, and vacuumizing the sample chamber of the field emission scanning electron microscope to make the resin target Under vacuum conditions; select the working distance of the cathodoluminescence probe; select the accelerating voltage of the electron beam; select the beam spot size of the electron beam; select the primary gain value; obtain the image of the single particle of monazite. The invention performs high-resolution cathodoluminescence luminescence imaging on monazite, solves the problem that monazite has always been black in cathodoluminescence, achieves a clear reflection of the internal structure characteristics of monazite, and achieves the purpose of accurate point selection for in-situ micro-region dating of monazite .

Description

technical field [0001] The invention relates to the technical field of image acquisition, in particular to a cathodoluminescence imaging method of single particle monazite. Background technique [0002] Monazite (Ce, La, Nd, Th) [PO 4 ] Phosphate minerals containing light rare earth (LREE) widely exist in various rocks, and their composition can reflect the characteristics of host rocks. At the same time, because monazite has high U and Th content, low initial ordinary Pb composition, high Pb closure temperature (about 750°C), and no influence of decrystallization, it becomes an excellent geological chronometer. . With the rapid development of secondary ion probe (SIMS) and laser ablation plasma mass spectrometry (LA-ICP-MS), as well as electron probe (EPMA) dating technology in the micro area, monazite has become the most important original One of the accessory minerals analyzed by microchronology. [0003] However, monazite originating from different lithologies will s...

Claims

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Application Information

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IPC IPC(8): G01N23/225
CPCG01N23/2254
Inventor 杨赛红闫欣陈意苏本勋谷立新唐旭
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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