新疆东天山石英滩金矿流体包裹体地球化学

GEOCHEMISTRY OF FLUID INCLUSIONS FROM THE SHIYINGTAN GOLD DEPOSIT IN EASTERN TIANSHAN, XINJIANG

石英滩金矿地处塔里木板块北缘阿奇山—雅满苏火山弧,容矿围岩为下二叠统阿其克布拉克组陆相火山岩,控矿构造为破火山口环形断裂。流体包裹体特征和温度等参数研究表明石英滩金矿以低温(129℃～236℃)、低盐度(1.91wt%NaCl～2.74wt%NaCl)和浅成(成矿时压力为3×106～32×106Pa,深度小于1km)为特征;流体包裹体稀土元素研究初步得出成矿流体来自中酸性岩浆和火山岩。

The Shiyingtan gold deposit, located in the Aqishan-Yamansu volcanic arc, northern Tarim plate, is hosted in Lower Permian Aqikebulake Group continental volcanic rocks. Ore-controlling structures are circular faults along a caldera. The measured temperature data of fluid inclusions show that the Shiyingtan gold deposit is featured with low temperature (129℃～236℃), low salinity (1.91wt%NaCl～2.74wt%NaCl) and shallow ore-forming depth (ore-forming pressure about 3×106～32×106Pa,ore-forming depth <1km). The analytical REE data of fluid inclusions indicate that the ore-forming fluids were derived from nearby intermediate-acid magmas and volcanoes.