山东纱岭金矿流体包裹体及氢氧硫同位素特征  

Characteristics of Fluid Inclusion and Stable Isotopes of Shaling Gold Deposit in Shandong Province

作　　者：祝培刚[1] 李秀章[1] 张文佳 王巧云[1] 王英鹏[1] 田瑞聪 张文[1] 陶有兵[1] 彭观峰 ZHU Pei-gang;LI Xiu-zhang;ZHANG Wen-jia;WANG Qiao-yun;WANG Ying-peng;TIAN Rui-cong;ZHANG Wen;TAO You-bing;PENG Guan-feng(Shandong Institute of Geological Survey, Jinan 250014, China;Shandong Institute of Geological Sciences, Jinan 250013,China)

机构地区：[1]山东省地质调查院,济南250014 [2]山东省地质科学研究院,济南250013

出　　处：《科学技术与工程》2021年第24期10165-10173,共9页Science Technology and Engineering

基　　金：国家重点研发计划(2017YFC060150);中国地质调查局项目(DD2019057019)。

摘　　要：为研究纱岭金矿成矿流体性质、成矿物质来源,通过在纱岭金矿深部钻孔中采取样品,开展流体包裹体测温、激光拉曼分析,氢氧硫同位素样品测试工作,研究了流体包裹体及氢氧硫同位素特征。结果表明:纱岭金矿流体包裹体的均一温度为141~400℃,平均值为261℃;盐度变化范围大致分布在1.02%~12.29%NaCl_(eq),平均5.75%NaCl_(eq);包裹体密度变化于0.62~1.05 g/cm^(3),平均0.80 g/cm^(3);包裹体的成分主要有CO_(2)、H_(2)O、CH_(4)等;不同矿石类型的包裹体温度、盐度、气液比的变化具有规律性,自断裂中心部位的黄铁绢英岩化碎裂岩至最外侧的黄铁绢英岩化花岗岩,其包裹体的温度逐渐降低,盐度逐渐升高;纱岭金矿区硫同位素δ^(34)S为8.2‰~10.60‰,平均值为9.94‰;石英的δ^(18)O_(quartz)的变化范围为10‰~13.8‰,δ^(18)O_(H_(2)O)为0.46‰~6.46‰,δD为-70.6‰~-89.7‰。纱岭金矿成矿流体属中低温、低盐度、低密度的H_(2)O-CO_(2)-NaCl±CH_(4)流体体系;金矿的成矿物质是多来源的,成矿流体主要为地幔流体及岩浆水,可能有大气降水的加入。金矿成矿深度大,剥蚀量小,深部找矿潜力较大。To explore the characteristics of ore-forming fluid and source of mineral-forming material of Shaling gold deposit,isotopic properties of hydrogen,oxygen and sulfur and the homogenization temperature of fluid inclusions sampled from drilling of the deposit were investigated by laser Raman analysis and isotopic measurement.The results show that the homogenization temperature of fluid inclusions are range in 141~400℃with the average value of 261℃;the salinity is 1.02%~12.29%NaCleq with the average value of 5.75%NaCleq,and the density is 0.62~1.05 g/cm^(3) with the average value of 0.80 g/cm^(3).The main components of the fluid inclusions are CO_(2),H_(2)O,CH_(4).The temperature,salinity and gas-liquid ratio of the fluid inclusions in different ores regularly vary with its occurred location,the homogenization temperature decreases and the salinity increases from beresitization cataclasite occurred at the center of the frature,to beresitization granite occurred at the outermost of the fracture.The δ^(34)S of Shaling gold deposit is 8.2‰~10.60‰and its average value is 9.94‰;theδ^(18)O_(quartz) of quartz is 10‰~13.8‰,the δ^(18)OH_(2)O is 0.46‰~6.46‰,and the δD is-70.6‰~-89.7‰.The ore-forming fluid of this deposit are the H2O-CO2-NaCl±CH4 with medium-low temperature,low salinity and low density.The ore-forming materials is muti-source and is mainly mantle-derived fluid,magmatic water and meteoric water.The ore-forming depth is large,and the denudation thickness is small,so the deep prospecting potential is great.

关 键 词：流体包裹体 同位素 成矿物质来源 成矿流体 纱岭金矿 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]