海南屯昌地区高通岭钼矿床的地质、地球化学特征及成矿时代  

Geology, geochemistry and ore-forming age of the Gaotongling molybdenum deposit, Tunchang area, Hainan, China

作　　者：廖香俊[1,2] 王平安[3] 覃海灿[4] 路西坤[4] 董法先[5] 刘晓春[5] 舒斌[3] 

机构地区：[1]中国地质大学,湖北武汉430074 [2]海南省地质矿产勘查开发局,海南海口570206 [3]中国地质调查局发展研究中心,北京100037 [4]海南省地质调查院,海南海口570206 [5]中国地质科学院地质力学研究所,北京100081

出　　处：《地质通报》2008年第4期560-570,共11页Geological Bulletin of China

基　　金：中国地质调查局国土资源调查项目《海南岛高品位大型热液金矿床调查预测与典型矿床研究》(编号:200110000003);《中国成矿体系与区域成矿评价》(编号:K1·4)资助

摘　　要：高通岭钼矿床位于华南板块南部的华南褶皱系五指山褶皱带内,共查明平行脉状矿体9个、矿化体5个。矿石分石英脉型和钾长花岗岩型2种,矿石中含辉钼矿、黄铁矿、黄铜矿、方铅矿、闪锌矿及石英、钾长石、黑云母、绢云母、绿泥石等。高通岭花岗岩体的Mo含量比其克拉克值高4倍,沿岩体构造裂隙发育钾长石化、黄铁矿化、硅化、绢云母化、绿泥石化等蚀变和钼矿化。成矿流体成分为K+-Na+-Cl--F--SO42-型;S、C、H、O同位素组成反映成矿物质以岩浆源为主,流体为岩浆水与大气降水混合来源。辉钼矿Re-Os等时线年龄为98.4Ma±2.5Ma,与高通岭花岗岩体侵位的时代一致。该矿床为与燕山晚期岩浆活动有关的热液石英-硫化物脉型钼矿床。The Gaotongling molybdenum deposit is located in the Wuzhishan fold belt of the South China fold system, Southern China plate. Nine orebodies of economic value and five mineralized bodies which are approximately parallel to each other have been identified. Ores are mainly of sulfide quartz vein type and K-feldspar granite type. The ores are composed mainly of sulfides such as molybdenite, pyrite, chalcopyrite, galena and sphalerite and gangue minerals such as quartz, potassium feldspar, biotite, sericite and chlorite. The molybdenum content in the Gaotongling granite intrusion is 4 times higher than its clarke value. Potassic alteration, pyritization, silicification, sericitization and chloritization, as weU as molybdenum mineralization are observed along structural fractures in the granite intrusion. The ore-forming fluids are of K^＋-Na^＋-C1^- -F^- -SO4^2- type. The sulfur, carbon, hydrogen and oxygen isotopic compositions suggest that the ore-fonrting materials were mainly derived from magma and that the ore-forming fluids originated by mixed sources of magmatic water and meteoric water. The Re-Os isochron age of molybdenite is 98.4±2.5 Ma, which coincides with the emplacement age of the Gaotongling granite intrusion. It is concluded that the deposit is a hydrothennal sulfide-quartz vein type deposit genetically related to Late Mesozoic （late Yanshanian） granitic magmatism.

关 键 词：海南屯昌地区 钼矿床 地质和地球化学特征 成矿时代 

分 类 号：P618.65[天文地球—矿床学]