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Miao Hua-qing, Li Guang-ming, Zhang Zhi, Xia Xiang-biao, Liang Wei. Origin of the Keyue Pb-Zn polymetallic deposit in southern Xizang:Evidences from sulfur and lead isotopic compositions[J]. Sedimentary Geology and Tethyan Geology, 2017, 37(2): 14-22.
Citation: Miao Hua-qing, Li Guang-ming, Zhang Zhi, Xia Xiang-biao, Liang Wei. Origin of the Keyue Pb-Zn polymetallic deposit in southern Xizang:Evidences from sulfur and lead isotopic compositions[J]. Sedimentary Geology and Tethyan Geology, 2017, 37(2): 14-22.
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Origin of the Keyue Pb-Zn polymetallic deposit in southern Xizang:Evidences from sulfur and lead isotopic compositions

  • 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China;

  • 2. Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China

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  • Received Date: March 30, 2017
  • Revised Date: May 01, 2017
  • Published Date: June 29, 2017
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    • Abstract
  • The Keyue Pb-Zn polymetallic deposit in southern Xizang is located in the eastern part of the Tethys Himalayan Sb-Au-Pb-Zn metallogenic belt, in which the lenticular or vein ore bodies strictly controlled by the NE-trending faults occur in the carbon-bearing calcareous slates of the Lower Jurassic Ridang Formation. The δ34S values of the sulfides from the ores range from 9.2‰ to 11.2‰, with an average of 9.85‰, similar to those of the Jurassic strata in the Ridang Formation, implying that S is mainly derived from the host strata. The sulfides from the ores give the lead isotopic ratios of 10.669-19.813 for 206Pb/204Pb, with an average of 19.740; 15.823-15.979 for 207Pb/204Pb, with an average of 15.902, and 40.104-40.687 for 208Pb/204Pb, with an average of 40.410. These higher lead isotopic ratios bear a striking resemblance to those of the Himalayan crystalline basement, possibly indicating that the lead in the ores comes from the Himalayan crystalline basement.
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