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Open AccessArticle

Geology and Geochronology of the Maozaishan Sn Deposit, Hunan Province: Constraints from Zircon U–Pb and Muscovite Ar–Ar Dating

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Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics, Central South University, Changsha 410083, China
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Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China
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Wuhan Centre of China Geological Survey, CGS, Wuhan 430205, China
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Institute of granitic diagenesis and metallogeny, Wuhan 430205, China
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The Geological Team No. 418, Hunan Development Bureau of Geology and Mineral Exploration, Loudi 417000, China
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Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 773; https://doi.org/10.3390/min9120773
Received: 31 October 2019 / Revised: 4 December 2019 / Accepted: 6 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Integrated Chronology Studies of Ore Deposits)
The Maozaishan Sn deposit, located south of the Dayishan ore field in the Nanling Range, is a newly explored greisen-type Sn deposit. Two muscovite samples from tin-bearing ores yielded 40Ar/39Ar plateau ages of 154.7 ± 1.1 Ma (Mean standard weighted deviation (MSWD) = 0.48) and 152.6 ± 0.7 Ma (MSWD = 0.25), respectively. Zircon U–Pb dating result of fine-grained biotite monzogranite in the Maozaishan mining area shows that these zircon grains can be subdivided into two populations, with ages of 154.2 ± 2.0 Ma (MSWD = 0.51) and 159.6 ± 1.9 Ma (MSWD = 0.09), respectively, indicating that the monzogranite is formed by a multi-stage magmatic event. It is indicated that formation of the Maozaishan Sn deposit is closely related to the Middle Jurassic granitic magmatism. Based on the trace element compositions of zircon grains, the calculated magma temperatures and oxygen fugacity (log(fO2)) values range from 638 °C to 754 °C (mean = 704 °C) and from −18.9 to −15.8 (mean = −17.1), respectively. In addition, these intrusive rocks in the Dayishan ore field belong to highly fractionated granites and are characterized by low oxygen fugacity and crust–mantle origin, which are consistent to these tin-bearing granites in the Nanling Range and in favor of the Sn mineralization. View Full-Text
Keywords: zircon U–Pb dating; muscovite Ar–Ar dating; oxygen fugacity; Maozaishan Sn deposit; Dayishan zircon U–Pb dating; muscovite Ar–Ar dating; oxygen fugacity; Maozaishan Sn deposit; Dayishan
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Guo, J.; Lu, Y.; Fu, J.; Qin, Z.; Ning, Y.; Zhang, Z. Geology and Geochronology of the Maozaishan Sn Deposit, Hunan Province: Constraints from Zircon U–Pb and Muscovite Ar–Ar Dating. Minerals 2019, 9, 773.

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