摘要
冈底斯岛弧带属冈底斯活动大陆边缘的组成部分。带内早自中侏罗世、晚至第三纪的中酸性火山岩以及与雅鲁藏布江结合带有成因联系的I型中酸性岛弧陆缘钙碱性侵入体(40～100Ma)和陆内汇聚造山引起的S型花岗岩体(15～50Ma)广泛发育。研究证实,冈底斯岛弧带属有色金属、贵金属成矿带。主要矿种的矿床类型有:海底火山热液型或火山喷流沉积型(Cu多金属)、海底热水沉积型(Cu、Pb、Zn等)、斑岩型(Cu、Mo)以及接触交代与岩浆期后地下水热液充填的复合型(Cu、Pb、Zn)等。这些多期、多阶段复合叠加成矿作用和多种矿床类型的“同带共存”格局,展示了冈底斯岛弧带的巨大找矿潜力。
The Gangdise island-arc belt is parallel to the Yarlung Zangbo suture zone.Middle to Tertiary intermediate-acid volcanic rocks,I-type intermediate-acid,island-arc and continental-margin,calc-alka-line intrusions related genetically to the suture and S-type granite formed by intracontinental convergence-orogeny are extensively developed in the Gangdise island-arc belt.This belt is a nonferrous metal and no-ble metal metallogenic belt.The deposit types of main minerals include the submarine volcanic-hydrother-mal type or volcanic exhalation-sedimentary type(Cu polymetallic ore deposits),submarine hydrothermal-sedimentary type(Cu ,Pb,Zn etc.),porphyry type(Cu and Mo )and contact metasomatic and post-magmatic subsurface hydrothermal fluid filling compound type(Cu ,Pb and Zn ).The pattern of the exis-tence of these polyphase and multi-stage telescoping mineralizations and many deposit types in the same belt shows the great ore potentials in the Gangdise island-arc belt.
出处
《地质通报》
CAS
CSCD
北大核心
2002年第1期35-40,共6页
Geological Bulletin of China
基金
中国地质调查局"西藏一江两河地区成矿规律和找矿方向综合研究"(编号199910200246)
