Invisible gold distribution on pyrite and ore-forming fluid process of the Huangshan orogenic-type gold deposit of Zhejiang, SE China: implications from mineralogy, trace elements, impurity and fluid inclusion studies
作者： Vijay Anand Sundarrajan , Zilong Li , Yizhou Hu , Xuheng Fu , Yuhuo Zhu
DOI: 10.1007/S00531-016-1353-9
关键词:
摘要: The Huangshan orogenic-type gold deposit in Zhejiang of SE China occurred quartz–pyrite veins. It is hosted by phyllonite that underwent greenschist-facies metamorphism along a large Jiangshan–Shaoxing tectonic belt with NE–SW direction. Trace elemental characteristics, ore-forming process and invisible on different forms pyrite quartz are studied. Au associated can be classified into two categories; recrystallized euhedral pyrite. precipitation mainly derived Co Ni AuHS2 − complex the mineralizing fluids events. XPS results revealed valence states Au3+ replaced 2Fe2+ Au0 Si4+ structure. electron paramagnetic resonance trace suggested element pairs Ge–Li–Al Mn–Co–Ni have distinct impurities as identified. A fluid inclusion study showed auriferous characterized low-saline CO2-rich fluids. Coexistence type I–type III inclusions same range homogenization temperature mode evidences immiscible process. temperature–pressure values ca. 250 °C/1250 bar 220 °C/780 bar for been calculated intersection coexisting during entrapment. may Wuyi–Yunkai orogeny early Paleozoic, including an upper–mid (450–420 Ma). All features suggest probably product linking Paleozoic South China.
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