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Mineralogy and Garnet Sm–Nd Dating for the Hongshan Skarn Deposit in the Zhongdian Area, SW China

1, 2,*, 3 and 4
1
School of Earth Resources, China University of Geosciences, Wuhan 4330074, China
2
State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
3
Jiangxi Institute of Geological Exploration for Mineral Resources of Nonferrous Metals, Nanchang 330025, China
4
Yunnan Geological Survey, Kunming 650051, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(4), 243; https://doi.org/10.3390/min9040243
Received: 23 February 2019 / Revised: 12 April 2019 / Accepted: 17 April 2019 / Published: 19 April 2019
(This article belongs to the Special Issue Polymetallic Metallogenic System)
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Abstract

The Hongshan deposit is one of the largest Cu-polymetallic deposits in the Zhongdian area, southwest China. Two types of Cu–Mo ores, mainly developed in the skarns, have been recognized in the Hongshan deposit, i.e., massive or layered skarn and vein-type, with the former being dominant. The highly andraditic composition of garnet (Adr100 to Adr64Gr32) and diopsidic composition of pyroxene (Di90Hd9 to Di1Hd99) indicate the layered skarn ores are of magmatic-hydrothermal origin that formed under oxidized conditions. Sm–Nd dating of garnet yield a well-constrained isochron age of 76.48 ± 7.29 Ma (MSWD = 1.2) for the layered skarn ores. This age was consistent with the Re–Os age for the pyrrhotite from the layered skarn ores, and thereby indicated that the layered skarn mineralization was formed in the Late Cretaceous, rather than in the Triassic as was previously thought. The coincidence of the geochronology from the layered skarn ores and vein-type mineralization further indicated that both ores were the result of a single genetic event, rather than multiple events. The recognition of the Late Cretaceous post-collisional porphyry–skarn Cu–Mo–W belt in the Zhongdian area exhibited a promising prospecting potential. View Full-Text
Keywords: skarn mineralogy; high fugacity; garnet Sm–Nd dating; Late Cretaceous; Hongshan skarn deposit skarn mineralogy; high fugacity; garnet Sm–Nd dating; Late Cretaceous; Hongshan skarn deposit
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Zu, B.; Xue, C.; Dong, C.; Zhao, Y. Mineralogy and Garnet Sm–Nd Dating for the Hongshan Skarn Deposit in the Zhongdian Area, SW China. Minerals 2019, 9, 243.

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