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Geoscience ›› 2021, Vol. 35 ›› Issue (06): 1597-1607.DOI: 10.19657/j.geoscience.1000-8527.2021.117

• Gold-polymetallic Mineralization in Qinling Orogens • Previous Articles     Next Articles

Geological Characteristics and S-Pb Isotope Geochemistry of the Sirengou Pb-Zn Deposit in Xunyang, Shaanxi Province

LIU Tianhang(), GAO Yongbao, WEI Liyong, ZHANG Zhen, TANG Weidong, JIA Bin   

  1. Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an, Shaanxi 710000, China
  • Received:2021-05-10 Revised:2021-10-10 Online:2021-12-10 Published:2022-02-14

Abstract:

The Sirengou Pb-Zn deposit, located in the southern limb of the Dayangshan syncline of the Southern Qinling Fold System, is hosted in the silty phyllite of the Upper Silurian Shuidonggou Formation (2nd member).The orebodies are layered, stratoid or lenticular in the interlayer fracture zones.Metallic minerals mainly include sphalerite, galena, pyrite, pyrrhotite, and chalcopyrite.The ores are massive, band, disseminated or veined, and the ore minerals are euhedral-subhedral granular, aggregate, or have replacement or solid solution texture.LA-MC-ICP-MS in-situ sulfur isotope analyses show that the ore sulfides have relatively stable isotopic compositions, with the δ 34S values of samples (0.17‰-2.03‰) showing normal distribution in the δ34S histogram, which indicates that the sulfur was sourced from the mantle and/or deep crust with minor wallrock input.Nine sulfide samples yielded 206Pb/204Pb=17.198-18.213 (avg.17.845), 207Pb/204Pb=15.564-15.627 (avg.15.610) and 208Pb/204Pb=37.982-38.471 (avg.38.206).Lead isotope compositions of the ores are also similar (narrow-range), indicating that the lead was derived from the upper crust with minor mantle input.Combined with the geological and geochemical characteristics, we suggest that the Sirengou deposit belongs to epigenetic hydrothermal filling-metasomatic-type.

Key words: geological characteristic, sulfur and lead isotope, ore genesis, Sirengou Pb-Zn deposit, Qinling orogen

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