| He–Ar Isotopic Tracing of Pyrite from Ore-forming Fluids of the Sanshandao Au Deposit, Jiaodong Area |
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| 作者姓名： | HAN Zhenyu YU Xiaowei LI Shoujun Tian Jingxiang WANG Zhongliang YU Xiaojing WANG Ligong |
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| 作者单位： | 1 College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
2 Yantai Natural Museum, Yantai, Shandong 264000, China,3 Shandong Institute of Geological Survey, Ji’nan 250014, China,1 College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China,4 Shandong Institute of Geological Sciences, Ji’nan 250014, China
5 Key Laboratory of Gold Mineralization Process and Resources Utilization, Ministry of Land and Resources Ji’nan 250014, China
6 Key Laboratory of Metal Mineralization Geological Processes and Resources Utilization in Shandong Province Ji’nan 250014, China,7 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing 100083 China,8 The third Exploration Institute of Geology and Mineral Resources of Shandong Province, Yantai, Shandong 264000, China and 3 Shandong Institute of Geological Survey, Ji’nan 250014, China |
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| 摘 要： | The Sanshandao Au deposit is located in the famous Sanshandao metallogenic belt, Jiaodong area. To date, accumulative Au resources of 1000 t have been identified from the belt. Sanshandao is a world-class gold deposit with Au mineralization hosted in Early Cretaceous Guojialing-type granites. Thus, studies on the genesis and ore-forming element sources of the Sanshandao Au deposit are crucial. He 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 570.8. These values represent the initial He and Ar isotopic compositions of ore-forming fluids for trapped fluid inclusions. The 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 process. The 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.
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| 收稿时间： | 2019/1/29 0:00:00 |
| 修稿时间： | 2019/3/14 0:00:00 |
He–Ar Isotopic Tracing of Pyrite from Ore‐forming Fluids of the Sanshandao Au Deposit,Jiaodong Area |
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| Authors: | HAN Zhenyu YU Xiaowei LI Shoujun Tian Jingxiang WANG Zhongliang YU Xiaojing and WANG Ligong |
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| Institution: | College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;Yantai Natural Museum, Yantai, Shandong 264000, China;Shandong Institute of Geological Survey, Ji'nan 250014, China;College of Earth Science & Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;Shandong Institute of Geological Sciences, Ji'nan 250014, China;Key Laboratory of Gold Mineralization Process and Resources Utilization, Ministry of Land and Resources Ji'nan 250014, China;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 Geosciences, Beijing 100083 China;The third Exploration Institute of Geology and Mineral Resources of Shandong Province, Yantai, Shandong 264000, China |
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| Abstract: | The Sanshandao Au deposit is located in the famous Sanshandao metallogenic belt, Jiaodong area. To date, accumulative Au resources of 1000 t have been identified from the belt. Sanshandao is a world‐class gold deposit with Au mineralization hosted in Early Cretaceous Guojialing‐type granites. Thus, studies on the genesis and ore‐forming element sources of the Sanshandao Au deposit are crucial. He and Ar isotopic analyses of fluid inclusions from pyrite (the carrier of Au) indicate that the fluid inclusions have 3He/4He=0.043–0.21 Ra with an average of 0.096 Ra and 40Ar/36Ar=488–664 with an average of 570.8. These values represent the initial He and Ar isotopic compositions of ore‐forming fluids for trapped fluid inclusions. The 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 process. The 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. |
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| Keywords: | Sanshandao Au deposit He and Ar isotopes fluid inclusions crustal fluid mantle-derived fluid |
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