摘要
地质、物探、化探、遥感的综合研究表明 ,西藏冈底斯东段蕴含着巨大的找矿潜力 ,矿化类型齐全 ,以斑岩型及喷流型为主。与构造演化相关形成四大成矿系列 :与新特提斯洋壳俯冲作用 (12 5～ 96Ma)有关的岩浆型 (Cr,Pt,Cu,Ni)矿床系列及喷流型(Cu,Pb,Zn,Ag)矿床系列 ;与弧—陆碰撞造山作用 (85～ 5 0 Ma)有关的浅成低温热液型 (Au,Ag,Pb,Zn,Sb)、构造蚀变岩型 (Au)及矽卡岩型 (Cu)矿床系列 ;与造山期后伸展走滑作用 (2 2～ 12 Ma)有关的斑岩型 (Cu,Mo)、隐爆角砾岩型 (Cu,Au,Pb,Zn)、剪切带型 (Au,Ag,Sb)及矽卡岩型 (Cu,Fe)矿床系列。由俯冲杂岩带向北 ,具有由结晶分异型 (熔离型 )—剪切带型 (蚀变岩型 )—矽卡岩型、浅成低温热液型—斑岩型—斑岩型 +喷流型—喷流型—热液充填交代型的分带趋势 ,成矿总体显示出同源多位、同位多期、深源浅成。
The geological, geophysical, geochemical and remote sensing comprehensive studies show the big ore prospecting potentiality is contained in the eastern section of the Gangdise Mountains,Tibet.The ore deposit is mainly of porphyry type and exhalation type.It falls into four kinds of metallogenic series related with tectonic evolution:magmatic type(Cr,Pt,Cu,Ni) and exhalation type(Cu,Pb,Zn,Ag) ore deposit series with relation to Neo Tethys oceanic crust subduction action;epithermal low temperature type(Au,Ag,Pb,Zn,Sb),altered fractured rock type(Au) and skarn rock type(Cu) ore deposit series with relation to arc continent collision;porphyry type(Cu,Mo), cryptoexplosion breccia type(Cu,Au,Pb,Zn), shear zone type(Au,Ag,Sb) and skarn rock type(Cu,Fe) ore deposit series with relation to extension slip action after orogenic period. From subductive complex to the north,zoning appears to be crystallization differentiation type (separation type)-shear zone type(altered rock type)-skarn rock type,epithermal low temperature type-porphyry type-porphyry type and exhalation type-exhalation type-hydrothermal filling-replacement type. The whole body of the ore deposit is characterized by multi places from the same source,parity and poly period,hypabyssal rock from the deep source and polygenetic compound.
出处
《地质科技情报》
CAS
CSCD
北大核心
2002年第2期55-60,共6页
Geological Science and Technology Information
基金
国家地调局项目 (2 0 0 0 10 2 0 0 15 4)
