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Article

Mineralogy and Metallogenesis of the Sanbao Mn–Ag (Zn-Pb) Deposit in the Laojunshan Ore District, SE Yunnan Province, China

by
Shengjiang Du
1,2,
Hanjie Wen
3,4,*,
Shirong Liu
3,
Chaojian Qin
3,
Yongfeng Yan
5,
Guangshu Yang
5 and
Pengyu Feng
5
1
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2
Chinese Academy of Geological Science, Beijing 100037, China
3
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
5
Kunming University of Science and Technology, Kunming 650093, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 650; https://doi.org/10.3390/min10080650
Submission received: 26 June 2020 / Revised: 17 July 2020 / Accepted: 17 July 2020 / Published: 23 July 2020
(This article belongs to the Special Issue Magmatic–Hydrothermal Alteration and Mineralizing Processes)
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Abstract

The Sanbao Mn–Ag (Zn-Pb) deposit located in the Laojunshan ore district is one of the most important deposits that has produced most Ag and Mn metals in southeastern Yunnan Province, China. Few studies are available concerning the distribution and mineralization of Ag, restricting further resource exploration. In this study, detailed mineralogy, chronology, and geochemistry are examined with the aim of revealing Ag occurrence and its associated primary base-metal and supergene mineralization. Results show that manganite and romanèchite are the major Ag-bearing minerals. Cassiterite from the Mn–Ag ores yielded a U–Pb age of 436 ± 17 Ma, consistent with the Caledonian age of the Nanwenhe granitic pluton. Combined with other geochemical proxies (Zn-Pb-Cu-Sn), the Sanbao Mn–Ag deposit may originally be of magmatic hydrothermal origin, rather than sedimentary. The Ag-rich (Zn-Pb (Sn)-bearing) ore-forming fluids generated during the intrusion of the granite flowed through fractures and overprinted the earlier Mn mineralization. Secondary Ag (and possibly other base-metals) enrichment occurred through later supergene weathering and oxidation.
Keywords: the Sanbao Mn–Ag deposit; manganite; romanèchite; rhodochrosite; Caledonian granitic pluton; China the Sanbao Mn–Ag deposit; manganite; romanèchite; rhodochrosite; Caledonian granitic pluton; China

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MDPI and ACS Style

Du, S.; Wen, H.; Liu, S.; Qin, C.; Yan, Y.; Yang, G.; Feng, P. Mineralogy and Metallogenesis of the Sanbao Mn–Ag (Zn-Pb) Deposit in the Laojunshan Ore District, SE Yunnan Province, China. Minerals 2020, 10, 650. https://doi.org/10.3390/min10080650

AMA Style

Du S, Wen H, Liu S, Qin C, Yan Y, Yang G, Feng P. Mineralogy and Metallogenesis of the Sanbao Mn–Ag (Zn-Pb) Deposit in the Laojunshan Ore District, SE Yunnan Province, China. Minerals. 2020; 10(8):650. https://doi.org/10.3390/min10080650

Chicago/Turabian Style

Du, Shengjiang, Hanjie Wen, Shirong Liu, Chaojian Qin, Yongfeng Yan, Guangshu Yang, and Pengyu Feng. 2020. "Mineralogy and Metallogenesis of the Sanbao Mn–Ag (Zn-Pb) Deposit in the Laojunshan Ore District, SE Yunnan Province, China" Minerals 10, no. 8: 650. https://doi.org/10.3390/min10080650

APA Style

Du, S., Wen, H., Liu, S., Qin, C., Yan, Y., Yang, G., & Feng, P. (2020). Mineralogy and Metallogenesis of the Sanbao Mn–Ag (Zn-Pb) Deposit in the Laojunshan Ore District, SE Yunnan Province, China. Minerals, 10(8), 650. https://doi.org/10.3390/min10080650

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