Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1669-1682.doi: 10.13278/j.cnki.jjuese.20170289

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Geological Characteristics and S Isotopic Compositions of Pyrite from Lianzigou Gold Deposit in Xiaoqinling Area, and It's Genetic Significance

Dai Junzhi1,2, Gao Jusheng1, Qian Zhuangzhi2, Zhang Longbin3, Zhou Jinlong3, Li Ping3, Gao Yi3   

  1. 1. Northwest Geological and Mining Group Co. Ltd. for Nonferrous Metals, Xi'an 710054, China;
    2. School of Earth Science and Resources, Chang'an University, Xi'an 710054, China;
    3. No.712 General Party Co. Ltd. of Northwest Mining and Geology for Nonferrous Metals, Xianyang 712000, Shaanxi, China
  • Received:2018-03-20 Published:2018-11-26
  • Supported by:
    Support by Postdoctor Program of Northwest Geological and Mining Group Co.Ltd.for Nonferrous Metals (NWME[2016]46)

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Abstract: The Lianzigou gold deposit is located in the west of Xiaoqinling gold mineralization concentrated region, the south margin of the North China craton. The orebodies are hosted in the upper strata of Taihua group and controlled by fault fracture zones or quartz veins. The surficial and zonal potassic alteration is the typical wall rock alteration. The mineral assemblage is quartz-pryite-galena-chalcopyrite±barite±magnetite. For discussion of the ore-forming materials and ore genesis, the S isotopic compositions of pyrites of the gold deposit were measured by using Laser-ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). The S isotopic compositions in different ore-forming stages range from -15.27‰ to -11.98‰, with an average of -13.35‰, which is less than the S isotopic value (9.8‰ -12.4‰) of barite. We calculated the total S isotopic value (-5.5‰) of the coexisting barite, which is different from Taihua group and those granites of Yanshanian. Based on the geological characteristics and isotopic compositions, Taihua group had obvious influence on the source of the ore-forming materials than those granites of Yanshanian (Huashan pluton), but not the major source. Deep fluids or pluton is the possible mineralization sources of the Lianzigou gold deposit. The gold deposit is controlled by deep fluids and structure. There is a potential to find structural altered rock type or fine disseminated type of gold deposits in the deep part,but its scale will be limited.

Key words: Lianzigou gold deposit, in-situ S isotopic, ore-forming materials, deep fluids, Xiaoqinling

CLC Number: 

  • P618.51
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