Molybdenite Re–Os, zircon U–Pb dating and Hf isotopic analysis of the Shuangqing Fe–Pb–Zn–Cu skarn deposit, East Kunlun Mountains, Qinghai Province, China

Xia, Rui, Wang, Changming, Qing, Min, Deng, Jun, Carranza, Emmanuel John M., Li, Wenliang, Guo, Xiaodong, Ge, Liangsheng, and Yu, Wanqiang (2015) Molybdenite Re–Os, zircon U–Pb dating and Hf isotopic analysis of the Shuangqing Fe–Pb–Zn–Cu skarn deposit, East Kunlun Mountains, Qinghai Province, China. Ore Geology Reviews, 66. pp. 114-131.

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Abstract

The Shuangqing Fe–Pb–Zn–Cu deposit is located in the Xiangride County of Qinghai Province, China, and is a typical example of skarn deposits in the East Kunlun Mountains. Skarnization and mineralization took place along the contact zone between Carboniferous carbonates and the concealed Triassic plagiogranite. LA–ICP–MS U–Pb dating of zircons from the plagiogranite has yielded ages of 227.2 ± 1.0 and 226.54 ± 0.97 Ma, which are interpreted as the emplacement age of the plagiogranite. Molybdenites separated from ore-bearing quartz-veins yielded a Re–Os isochron age of 226.5 ± 5.1 Ma. These age data confirm that both intrusion and related skarn mineralization initiated at ~ 227 Ma. Re contents of molybdenite, zircon εHf(t) and (176)Hf/(177)Hf values fall into the ranges 3.31 to 6.58 μg/g, − 8.6 to − 0.0, and 0.282403 to 0.28263850, respectively. The timing of the Shuangqing Fe–Pb–Zn–Cu mineralization coincided with a major change in the stress field in East Kunlun from transpression to extension, related to the partial melting of thickening crustal materials in a post-collisional tectonic setting.

Item ID: 37200
Item Type: Article (Research - C1)
ISSN: 1872-7360
Keywords: Skarn deposit; Molybdenite Re–Os; Zircon U–Pb; Hf isotope; Shuangqing; East Kunlun Mountains
Funders: National Basic Research Program of China (NBRP), Fundamental Research Funds for the Central Universities (FRFCU), China Geological Survey Program (CGSP), Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), 111 Project
Projects and Grants: NBRP No. 2015CB452603, NBRP No. 2009CB421008, FRFCU No. 2652013034, CGSP No. 1212011220665, CGSP No. 12120114083301, 111 Project No. B07011
Date Deposited: 18 Jun 2015 03:00
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 35%
04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 35%
04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 30%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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