兹格塘错幅地质调查新成果及主要进展  

New results and major progress in regional geological survey of the Zigê Tangco Sheet

作　　者：郑有业[1,2] 许荣科[1,2] 何建社 赵平甲 邹国庆 李维军 次邛 杨书正 泽仁扎西 

机构地区：[1]西藏自治区地质调查院 [2]中国地质大学,湖北武汉430074

出　　处：《地质通报》2004年第5期538-542,共5页Geological Bulletin of China

基　　金：中国地质调查局青藏高原1:25万兹格塘错幅(I46C004001)地调项目(No.20001300009241)成果。

摘　　要：在地层、岩浆岩、构造研究等方面取得重要进展。①晚侏罗世尕苍见火山弧和齐日埃加查蛇绿混杂岩的发现,揭示出班公湖-怒江洋盆在中晚侏罗世存在向北俯冲的迹象;②在晚白垩世、古近纪陆相火山岩和燕山期构造岩浆活动序次等研究方面,取得了一批同位素年代测定结果,对羌南中新生代构造演化过程及高原隆升的反演具有重要意义;③东巧一带变质橄榄岩的流变学研究,证实其在洋盆消减、仰冲过程中经历了复杂的变形机制;④发现具有经济价值的新的锑铜矿化层位。Important progress has been made in the study of stratigraphy, magmatic rocks and structure. ① The discovery of the Late Jurassic Gacangjian volcanic arc and Qiriaijiacha ophiolitic mélange reveals that there was the sign of northward subduction of the Bangong Co-Nujiang oceanic basin in the Mid-Late Jurassic; ② A number of isotope age data have been obtained in the study of Late Cretaceous and Paleogene continental volcanic rocks and sequences of Yanshanian tectonomagmatic activities, which has great significance for the deduction of the Meso-Cenozoic tectonic evolutionary process in southern Qiangtang and plateau uplift; ③ The rheological study of metaperidotite in the vicinity of Dongqiao verified that the rock underwent a complex deformation mechanism during the subduction and obduction of the oceanic basin; and ④ A new antimony-copper mineralization horizon of economic value has been found.

关 键 词：蛇绿混杂岩 中-新生代火山岩 同位素年代 变质橄榄岩 变形机制 班公湖-怒江带 

分 类 号：P623.12[天文地球—地质矿产勘探]