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《Mineral Deposits》 1998-01
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GEOLOGY AND GEOCHEMISTRY OF THE DABEIWU GOLD DEPOSIT, JIANGXI PROVINCE

Wang Ping'an,Dong Faxian,Liu Jianmin,Chen Bailin,Zhu Yongyu (Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081) Shen Tingyuan (No. 916 Geological Party, Jiangxi Bureau of Exploration and Development of Geology and Mineral Resources, Jiujiang 332100)  
Located on the west side of a Late Mesozoic granitic intrusive (132×10 6 ̄120×10 6 a), the Dabeiwu gold deposit is hosted by the 2nd Lithologic Formation of metasedimentary rocks of the Mesoproterozoic Shuangqiaoshan Group. Orebodies occur as veins, lenses or beads within or outside the quartz viens, controlled by a ductile sheer zone and the compressional fracture zones in this ductile sheer zone. Au abundances are 6 90×10 -9 in the 2nd Lithologic Formation of the Pt 2~3 Shuangqiaoshan Group, and (40 ̄42 99)×10 -9 in the ductile shear zone of the same formation. Rb Sr isochron ages of (118 08±1 26)×10 6 a were obtained through the measurement of hydrothermal altered minerals such as chlorite, calcite, hydromica and moscovite from the orebodies. Fluid-inclusion studies of quartz yield homogenization temperatures of 180℃ to 386℃, trapping temperatures 233℃ to 423℃, and fluid pressures of (224 ̄826)×10 5 Pa. Salinities of primary fluid inclusions range from 2 7 to 5 1 wt%NaCl equivalent and densities are 0 618 to 0 917 g/cm 3. Isotope geochemical studies show that δ 34 S values of pyrite and of arsenopyrite range from -7 1 to -4 9 per mil and from -11 8 to -6 0 per mil, respectively. δ 13 C volume of calcite from the ore is -5 3 per mil, and its δ 18 O is +15 9 per mil. δ 18 O and δ D values of quartz are +14 8 to +16 9 per mil and -65 to -60 per mil, respectively. Volumes of δ 18 O water evaluated from fluid-inclusion trapping temperatures range from +8 63 to +10 78 per mil. δ 30 Si volumes of quartz from the ore vein and the Mesoproterozoic knotted slate are -0 5 and -4 per mil, respectively. Initial strontium isotope ratios of the altered minerals and of the granite are 0 711279 and 0 7162 ̄0 7214, respectively. Sulfur, lead, carbon, silicon, oxygen hydrogen and strontium isotopic data indicate that the ore-forming substances of this deposit were derived mainly from the crust, and the ore-forming fluids were mainly magmatic fluids and subordinately metamorphic residual intercrystalline fluids. Mineralization was mainly associated with the Late Mesozoic granitic magmatism. Based on the study of its geology, geochemistry, metallogenic epoch and ore-control structures, it is concluded that the Dabeiwu gold deposit is a mesothermal to hypothermal type gold deposit related to the Yanshanian granitic mamatism and controlled by magmatite and shattered zones. This conclusion is rather different from the previous genetic view that the deposit was of the shear zone type formed in Neoproterozoic.
【Fund】: 地质矿产部定向科研项目成果
【CateGory Index】: P618.51
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