藏南硅质岩地质地球化学特征及其成矿效应  

GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS AND RELATED MINERALIZATION OF CHERTS IN SOUTH TIBET

作　　者：何俊国[1] 周永章[1] 杨志军[1] 张澄博[1] 付伟[1] 

机构地区：[1]中山大学地球科学系地球环境与地球资源研究中心,广东广州510275

出　　处：《矿产与地质》2004年第5期405-409,共5页Mineral Resources and Geology

基　　金：获国家科技部973项目(G1999043200);国家自然科学基金(40073010);全国高等学校博士点基金(2000099815);教育部优秀青年教师资助计划(教育司2001-39)项目资助。

摘　　要：西藏南部地区广泛发育中、新生代硅质岩,具有层状构造、纹理状构造、块状构造和角砾状等典型古热水沉积构造,其Al/(Al+Fe+Mn)比值、Co/Ni比值、Fe/Ti比值、氧同位素以及TiO2-Al2O3图解等地球化学特征显示为热水成因。藏南沉积硅质岩与锑、金多金属等矿化关系密切,成矿流体和热水流体有很强的相关性。There occurred abundant cherts of Mesozoic and Cenozoic Age in south Tibet, the layered, laminated, massive and breccia structures indicate that the cherts are hydrothermal origin. Ratios of Al/(Al+Fe+Mn),Co/Ni,Fe/Ti and W(TiO_2) W(Al_2O_3) diagram also show that they are the results of hydrothermal sedimentation. The cherts have a close relationship with Sb、Au polymetallic mineralization and ore-forming fluid correlates strongly with hydrothermal water.

关 键 词：地质地球化学特征 热水成因 成矿效应 藏南 

分 类 号：P588.244[天文地球—岩石学]