川西冕宁-德昌REE矿带风化型矿床的矿石类型及成因

李自静; 刘琰

doi:10.3799/dqkx.2018.722

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1307-1320

Li Zijing, Liu Yan, 2018. Ore Types and Genesis of Weathered Deposits in Mianning-Dechang REE Ore Belt, Western Sichuan Province, Southwestern China. Earth Science, 43(4): 1307-1320. doi: 10.3799/dqkx.2018.722

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Li Zijing, Liu Yan, 2018. Ore Types and Genesis of Weathered Deposits in Mianning-Dechang REE Ore Belt, Western Sichuan Province, Southwestern China. Earth Science, 43(4): 1307-1320. doi: 10.3799/dqkx.2018.722

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Ore Types and Genesis of Weathered Deposits in Mianning-Dechang REE Ore Belt, Western Sichuan Province, Southwestern China

doi: 10.3799/dqkx.2018.722

Li Zijing,
Liu Yan^,

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2017-11-24
Publish Date: 2018-04-15

Abstract

Abstract

The study of weathered ores is relatively limited in the Mianning-Dechang REE ore belt, western Sichuan. According to the geological survey in recent years, ore types and genesis of suspected weathered ore from Dalucao, Maoniuping and Muluozhai deposits were studied through EPMA, XRD and whole rock analysis. The results show that a large number of clay minerals (up to 40%) and ore minerals (up to 60%) are developed in the weathered ore of the Dalucao deposit, and the weathering degree is relatively high. On the contrary, suspected weathered ore types almost have not developed clay minerals from Maoniuping and Muluozhai deposits, and the weathering degree is relatively low. Through the geochemical characteristics and mineral composition analysis of the suspected weathered ore in Maoniuping and Muluozhai deposits, combining the compositions and occurrences of the wall rock and veins, it is obvious that the suspected weathed ore has been formed by mainly mechanically weathering from the nearby veins and wall rock under the strong tectonic action. Frequent breccia activities promote the strong mechanically weathering of weathered ores, and accelerate the water-rock reaction in Dalucao deposit. At present, there is no obvious biological weathering in the ore belt. The weathered ores in the belt have lower weathering degree than that of the Nanling ion adsorption type rare earth elements ores, and the age of the formation of the belt is younger (11 Ma) and a large amount of bastnaesite preservation, so it has not formed the ion adsorption type deposit.
- Mianning-Dechang,
- REE deposit,
- weathered deposit,
- ore type,
- ore genesis,
- geochemistry

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References(49)

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