The Geological Characteristics and Ore Genesis of the Qiucun Gold Deposit, Fujian Province
HUANG Bao1, NI Pei1, XIANG Hong-liang2, WANG Guo-guang1, YANG Yu-long1, PAN Jun-yi1, LI Su-ning1, BAO Tan1
1. State Key Laboratory for Mineral Deposit Research, School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China;
2. Fujian Shuangqishan Mining Ltd, Dehua 362500, China
Abstract：The Qiucun gold deposit, hosted in the Nanyuan Formation consisting of continental arc volcanic rocks, is controled by NE-NNE trending faults. In order to figure out the geological characteristics and ore genesis of the Qiucun gold deposit, detailed studies of wall rock alteration, ore mineral composition and fluid inclusion were carried out. Wall rock alteration study shows that gold mineralization is closely associated with quartz(chalcedony)-illite-pyrite-calcite assemblages, which are typical of low-sulfidation epithermal system. EPMA analysis indicate that the electrum consists of 62%~69% gold and 28%~33% sliver with gold mean fineness of 674. Liquid-rich two-phase aqueous fluid inclusions are dominated in auriferous quartz veins, only minor vapor-rich fluid inclusions occurred in such quartz veins. Liquid-rich fluid inclusions have homogenization temperatures(Th)of 180-250℃ and salinities of 0.5%-3.0% NaCl equivalent. Laser Raman analysis shows that the vapor phase of the inclusions are mainly H2O. All the results indicate that the Qiucun gold deposit belongs to a low-sulfidation epithermal deposit.
黄宝, 倪培, 项洪亮, 王国光, 杨玉龙, 潘君屹, 李肃宁, 鲍谈. 福建邱村金矿地质特征及矿床成因[J]. 矿物岩石地球化学通报, 2017, 36(4): 650-659.
HUANG Bao, NI Pei, XIANG Hong-liang, WANG Guo-guang, YANG Yu-long, PAN Jun-yi, LI Su-ning, BAO Tan. The Geological Characteristics and Ore Genesis of the Qiucun Gold Deposit, Fujian Province. Acta Metallurgica Sinica, 2017, 36(4): 650-659.
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