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
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
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DOI：
10.1016/j.oregeorev.2014.10.024
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发表时间：
2015-04
影响因子：
3.3
通讯作者：
Rui Xia;Changming Wang;Min Qing;Jun Deng;E. Carranza;Wenliang Li;Xiaodong Guo;Liangsheng Ge-
中科院分区：
文献类型：
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作者：
Rui Xia;Changming Wang;Min Qing;Jun Deng;E. Carranza;Wenliang Li;Xiaodong Guo;Liangsheng Ge-
双清铁铅锌铜矿床位于中国青海省相日勒县，是东昆仑矽卡岩矿床的典型代表。沿石炭系碳酸盐岩与隐伏三叠系斜长花岗岩接触带发生矽卡仑化和成矿作用。斜长花岗岩锆石LA-ICP-MS U-Pb测年结果表明，锆石年龄分别为227.2±1.0 Ma和226.54±0.97 Ma，为斜长花岗岩的侵位年龄。从含矿石英脉中分离出的辉钼矿的Re-Os等时年龄为226.5±5.1 Ma。这些年龄资料证实，侵入岩及相关的矽卡岩成矿作用起始于~ 227 Ma。辉钼矿、锆石的εHf(t)和176hf /177Hf的Re含量分别为3.31 ~ 6.58 μg、- 8.6 ~ - 0.0和0.282403 ~ 0.28263850。双庆铁铅锌铜成矿时间与东昆仑应力场由挤压向伸展的重大变化相吻合，与碰撞后构造环境下地壳增厚物质的部分熔融有关。
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) and176Hf/177Hf 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.