MAO Guangzhou1, 2, * , HUA Renmin2, LONG Guangming2 and LU Huijuan2
1 Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Geological Sciences & Engineering, Shandong University of Science and Technology, Qingdao 266590, China;2 State Key Laboratory of Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, ChinaThe research was jointly supported by the National Natural Science Foundation of China (No. 41202083, 40373025) and the Research Award Fund for Outstanding Middle-aged and Young Scientist of Shandong Province (BS2013HZ024).
The Jinshan gold deposit is located in the Northeast Jiangxi province, South China, which related to the ductile shear zone. It contains two ore types, i.e. the alteration-type ore and the gold-bearing quartz vein ore. Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit. Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma, with an initial 87Sr/86Sr value of 0.7045±0.0020. However, the age of the gold-bearing quartz vein-type ore is about 379±49Ma, and the initial 87Sr/86Sr is 0.7138±0.0011. Based on the age data from this work and many previous studies, the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization, which may include the Jinninian, Caledonian, Hercynian, and Yanshanian Periods. Among them, the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit. The Jinninian Period is the main stage for the formation of alteration-type ore bodies, while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type. The initial values of the 87Sr/86Sr from this study, as well as the previous isotope and trace element studies, indicate that the ore-forming materials mainly derived from the metamorphic wall rocks, and the ore-forming fluids mainly originated from the deep metamorphic water.
The Jinshan gold deposit is located in the Northeast Jiangxi province, South China, which related to the ductile shear zone. It contains two ore types, i.e. the alteration-type ore and the gold-bearing quartz vein ore. Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit. Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma, with an initial 87Sr/86Sr value of 0.7045±0.0020. However, the age of the gold-bearing quartz vein-type ore is about 379±49Ma, and the initial 87Sr/86Sr is 0.7138±0.0011. Based on the age data from this work and many previous studies, the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization, which may include the Jinninian, Caledonian, Hercynian, and Yanshanian Periods. Among them, the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit. The Jinninian Period is the main stage for the formation of alteration-type ore bodies, while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type. The initial values of the 87Sr/86Sr from this study, as well as the previous isotope and trace element studies, indicate that the ore-forming materials mainly derived from the metamorphic wall rocks, and the ore-forming fluids mainly originated from the deep metamorphic water.
MAO Guangzhou, * , HUA Renmin, LONG Guangming and LU Huijuan.2013. Rb-Sr Dating of Pyrite and Quartz Fluid Inclusions and Origin of Ore-forming Materials of the Jinshan Gold Deposit, Northeast Jiangxi Province, South China[J]. ACTA GEOLOGICA SINICA(English edition),87(6):1658~1667
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