Re-Os dating of molybdenite from the Kafang skarn copper (tin) deposit in the Gejiu tin polymetallic ore district and its geological significance

Yang, ZongXi, Mao, JingWen, Chen, MaoHong, Tong, Xiang, Wu, JunDe, Cheng, Yanbo, and Zhao, HaiJie (2008) Re-Os dating of molybdenite from the Kafang skarn copper (tin) deposit in the Gejiu tin polymetallic ore district and its geological significance. Acta Petrologica Sinica, 24 (8). pp. 1937-1944.

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Abstract

The Gejiu tin polymetallic ore district is a famous tin polymetallic ore producing area in Yunnan Province. The Kafang skarn copper (tin) deposit is one of important mineral deposits of the Gejiu region. Re-Os dating of five molybdenite separated from the Kafang skarn ore bodies gives an isochron age of 83.4 ± 2.1Ma and model age ranges from 82.95 ± 1.16 to 83.54 ± 1.31 Ma. This age is in good agreement with Laoka granite zircon LA-ICP-MS U-Pb age(85 ± 0.85Ma). These ages suggest that the mineralization in the Kafang skarn deposit was genetically assoicatted to the Laoka granite. The Re contents of molybdenite indicate that ore-forming materials are derived from mantle and crust. Based on the geochronological data of Dulong Sn-Zn deposit, Bainiuchang Ag super-large deposit, Dachang tin polymetallic ore field and Wangshe Cu-W deposit and analysis of tectonic evolution of Southeast of Yunnan Province, we propose that these deposits occurred at the same geodynamic framework as a result of large scale mineralization in South China.

Item ID: 40124
Item Type: Article (Research - C1)
ISSN: 1000-0569
Keywords: Gejiu, Kafang skarn copper (tin) deposit, Re-Os isotopic dating
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Date Deposited: 20 Aug 2015 02:24
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 100%
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