矿物自动分析系统在碳酸岩型稀土地球化学勘查中的应用

doi:10.11720/wtyht.2022.1381

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Abstract

In recent years, China has been strengthening the exploration of rare earth resources in order to secure the status of China as a large rare earth resource country. Geochemical exploration is an important means of mineral exploration, This paper summarizes the geochemical exploration of rare earth, finds out the existing problems and puts forward solutions. The carbonatite related rare earth anomalies are characterized by low contrast and small scale, the reasons are: ① the industrial grade of rare earth ore is enriched to a low degree relative to the abundance of the earth's crust, which is easily diluted by non-mineral anomalies caused by granite, etc.; ②the size of rare earth ore-forming indicator minerals are small and difficult to sort by traditional method, thus the epigenetic migration and enrichment pattern is not well understood, and it is difficult to develop a targeted sampling method. The automatic mineral analysis system based on scanning electron microscopy and energy spectrum can realize the quantitative statistics of chemical composition and morphological parameters of rare earth minerals at the micron level, which provides the basis for the study of epigenetic migration pattern of rare earth minerals. In recent years, in the field of geochemical exploration, previous research on the variation pattern of micro scale grain mineral content in the ore body-stream sediment system using the automatic mineral analysis system has shown the good application prospect of this method. In the future, the automatic mineral analysis system can be used to carry out:①research on the change of rare earth mineral size during weathering process; ②research on the migration and enrichment of rare earth minerals in the ore body-aqueous sediment system. Thus, the distribution characteristics and migration and enrichment rules of rare earth indicative minerals in ore-body, soil-stream sediment system are clarified, providing theoretical support for geochemical exploration of rare earth.

Key words： automated mineral analysis system QEMSCAN carbonatite-related REE deposits geochemical exploration

Received: 09 July 2021 Published: 21 June 2022

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	Dong-Sheng LIU
	Yuan-Yuan CHEN

Cite this article:

Dong-Sheng LIU,Yuan-Yuan CHEN. Application of automated mineral analysis systems in geochemical exploration of carbonatite-related REE deposits[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 637-644.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1381 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/637

Lanthanum geochemical patterns and carbonatite-type REE deposits in southern China

Gold geochemical patterns and carbonatite-type REE deposits in southern China

Some common REE-rich minerals under a microscope
a—sodium amphibole; b—acicular neonite; c—fluorite; d—chlorite; e—monazite; f—bastnasite (white); g—nastite; h—epidote (dark part)

Analysis flow of QEMSCAN method

An example of studying the surficial migration law of rare earth minerals with QEMSCAN

An example of quantitative evaluation of roundness and mineral association of rare earth minerals with QEMSCAN

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