TECTONO-CONTROLLING CHARACTERISTICS AND GENESIS OF DAXIN GOLD DEPOSIT IN HUNAN PROVINCE
GONG Guilun1,2,3, CHEN Guanghao1, DAI Jianbin2, CHEN X i2 and LI Wuyi2 (1.Guangzhou Institute of Geochemistry, Chinese Academy of Science, Gu angzhou, GD 510640, China; 2.No.11 Detachment of Gold Army of Chinese Armed Poli ce Forces, Ningxiang, HN 410600, China; 3.Graduate School of Chinese Academy of Sciences, Beijing 100049, China)
Daxin gold deposit in Hunan province is located i n the northeast edge of the Dachengshan dome, and specifically in the middle part of the Baimashan-Longshan E-W trending ore zone of the Xiangzhong ore district . A large number of brittle faults cut across the Sinian Jiangkou Group in the c ore of the dome. These faults, constituting the transmission and host structure of mineralization in the Daxin gold deposit, are probably resulted from activati on of the regional basic faults and emplacement of the underlying magmatic rocks . Formation of gold lodes was closely controlled by three groups of faults with NE-trend, NW-trend and N-trend respectively. The Daxin gold deposit possibly belong to the altered cataclastic rocks emplaced by the quartzose lodes, and may result from metasomatism and infilling of ore-bearing hydrothermal fluids alon g the fractural zones.