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Minerals 2018, 8(10), 448; https://doi.org/10.3390/min8100448

Re–Os Pyrite Geochronological Evidence of Three Mineralization Styles within the Jinchang Gold Deposit, Yanji–Dongning Metallogenic Belt, Northeast China

1
College of Earth Sciences, Jilin University, Changchun 130061, China
2
College of Exploration and Surveying Engineering, Changchun Institute of Technology, Changchun 130061, China
3
Gold Geological Institute of CAPF, Langfang 065000, China
4
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 11 September 2018 / Revised: 26 September 2018 / Accepted: 1 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Integrated Chronology Studies of Ore Deposits)
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Abstract

The Jinchang gold deposit is located in the eastern Yanji–Dongning Metallogenic Belt in Northeast China. The orebodies of the deposit are hosted within granite, diorite, and granodiorite, and are associated with gold-mineralized breccia pipes, disseminated gold in ores, and fault-controlled gold-bearing veins. Three paragenetic stages were identified: (1) early quartz–pyrite–arsenopyrite (stage 1); (2) quartz–pyrite–chalcopyrite (stage 2); and (3) late quartz–pyrite–galena–sphalerite (stage 3). Gold is hosted predominantly within pyrite. Pyrite separated from quartz–pyrite–arsenopyrite cement within the breccia-hosted ores (Py1) yield a Re–Os isochron age of 102.9 ± 2.7 Ma (MSWD = 0.17). Pyrite crystals from the quartz–pyrite–chalcopyrite veinlets (Py2) yield a Re–Os isochron age of 102.0 ± 3.4 Ma (MSWD = 0.2). Pyrite separated from quartz–pyrite–galena–sphalerite veins (Py3) yield a Re–Os isochron age of 100.9 ± 3.1 Ma (MSWD = 0.019). Re–Os isotopic analyses of the three types of auriferous pyrite suggest that gold mineralization in the Jinchang Deposit occurred at 105.6–97.8 Ma (includes uncertainty). The initial 187Os/188Os values of the pyrites range between 0.04 and 0.60, suggesting that Os in the pyrite crystals was derived from both crust and mantle sources. View Full-Text
Keywords: Re–Os isotopes; geochronology; Jinchang gold deposit; Yanji–Dongning Metallogenic Belt Re–Os isotopes; geochronology; Jinchang gold deposit; Yanji–Dongning Metallogenic Belt
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Li, S.-D.; Wang, Z.-G.; Wang, K.-Y.; Cai, W.-Y.; Peng, D.-W.; Xiao, L.; Li, J. Re–Os Pyrite Geochronological Evidence of Three Mineralization Styles within the Jinchang Gold Deposit, Yanji–Dongning Metallogenic Belt, Northeast China. Minerals 2018, 8, 448.

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