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He-Ar Isotope Geochemical Characteristics of Ore-forming Fluids for Panzijian Gold Deposit in Jiaodong Area of Shandong, China(PDF)


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He-Ar Isotope Geochemical Characteristics of Ore-forming Fluids for Panzijian Gold Deposit in Jiaodong Area of Shandong, China
MAO Guang-zhou123 HE Tie-liang12 XU Qing-lin1 YANG Feng-jie12 CAO Ming-ping1 AN Peng-rui1 DOU Yi-xin1 YU Xiao-wei2 LIU Xiao-tong4 MENG Ling-qiang5 SONG Li-guo1
(1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2. Shandong Institute of Geological Survey, Jinan 250014, Shandong, China; 3. Key Laboratory of Gold Mineralization Processes and Resource Utilization Subordinated to Ministry of Land and Resources/Key Laboratory of Metallogenic Geological Process and Resources Utilization in Shandong Province, Shandong Institute of Geological Sciences, Jinan 250013, Shandong, China; 4. Talent Innovation and Development Center of Rongcheng, Rongcheng 264300, Shandong, China; 5. Xinqiao Coal Mine, Yongcheng Coal and Electricity Holding Group Co., Ltd., Yongcheng 476600, Henan, China)
geochemistry gold deposit He-Ar isotope ore-forming fluid pyrite fluid inclusion enriched mantle Shandong
P597; P611
Panzijian gold deposit is located in the southern of Penglai-Qixia gold metallogenic belt, Jiaodong area, Shandong, which is a typical quartz vein type of gold deposit with high gold grade. However, the source and characteristic of ore-forming fluid are still controversial. Based on the theory of mineral microscopy and microstructure of pyrite, He-Ar isotopic composition of fluid inclusions from gold-bearing pyrite at the main metallogenic stages(quartz-pyrite(sericite)and gold-quartz-polymetallic sulfide stages)in Panzijian gold deposit was measured. The results show that the abundances of 3He of fluid inclusions from gold-bearing pyrite in Panzijian gold deposit are(3.49-8.50)×10-14 cm3 STP·g-1, the abundances of 4He are(2.46-5.06)×10-8 cm3 STP·g-1, and 3He/4He ratios are 0.8Ra-1.2Ra(Ra is 3He/4He ratio in air, Ra=1.39×10-6), indicating that the ore-forming fluid exhibits crust-mantle mixing characteristics dominated by enriched mantle; the abundances of 40Ar are(1.02-2.65)×10-7 cm3 STP·g-1, and 40Ar/36Ar ratios are 896.3-1 724.1, which are 2-3 times of the ratio of atmospheric saturated water, but similar to the ratios of samples from mantle-derived rocks in the northeastern China, indicating that the ore-forming fluid mainly comes from enriched mantle, and the crustal fluid also participates in mineralization, because there is a certain amount of 40Ar of crustal radioactivity in the ore-forming fluid. Therefore, it is believed that ore-forming fluid in Panzijian gold deposit is a crust-mantle mixed fluid dominated by enriched mantle fluid.


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Last Update: 2020-03-24