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He–Ar Isotopic Tracing of Pyrite from Ore-forming fluids of the Sanshandao Au Deposit, Jiaodong Area

Acta Geologica Sinica(English Edition) 2019年第6期93卷 1797-1807页

作者： HAN Zhenyu YU Xiaowei LI Shoujun Tian Jingxiang WANG Zhongliang YU Xiaojing WANG Ligong College of Earth Science&Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Yantai Natural Museum YantaiShandong 264000China Shandong Institute of Geological Survey Ji’nan 250014China Shandong Institute of Geological Sciences Ji’nan 250014China Key Laboratory of Gold Mineralization Process and Resources Utilization Ministry of Land and Resources Ji’nan 250014China Key Laboratory of Metal Mineralization Geological Processes and Resources Utilization in Shandong Province Ji’nan 250014 China State Key Laboratory of Geological Process and Mineral Resources China University of GeosciencesBeijing 100083 China The third Exploration Institute of Geology and Mineral Resources of Shandong Province YantaiShandong 264000China

The Sanshandao Au deposit is located in the famous Sanshandao metallogenic belt,Jiaodong *** date,accumulative Au resources of 1000 t have been identified from the *** is a world-class gold deposit with Au mineralization hosted in Early Cretaceous Guojialing-type ***,studies on the genesis and ore-forming element sources of the Sanshandao Au deposit are *** and Ar isotopic analyses of fluid inclusions from pyrite(the carrier of Au)indicate that the fluid inclusions have 3 He/4 He=0.043–0.21 Ra with an average of 0.096 Ra and 40 Ar/36 Ar=488–664 with an average of *** values represent the initial He and Ar isotopic compositions of ore-forming fluids for trapped fluid *** comparison of H–O isotopic characteristics combined with deposit geology and wall rock alteration reveals that the ore-forming fluids of the Sanshandao Au deposit show mixed crust–mantle origin characteristics,and they mainly comprise crust-derived fluid mixed with minor mantle-derived fluid and meteoric water during the uprising *** ore-forming elements were generally sourced from pre-Cambrian meta-basement rocks formed by Mesozoic reactivation and mixed with minor shallow crustal and mantle components.

关键词： Sanshandao Au deposit He and Ar isotopes fluid inclusions crustal fluid mantle-derived fluid

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