东昆仑地质特征及晚古生代——中生代构造演化  

GEOLOGICAL CHARACTERISTICS OF EAST KUNLUN AND TECTONIC EVOLUTION IN LATE PALAEZOIC—MESOZOIC ERA

作　　者：古凤宝[1] 

机构地区：[1]青海省区调综合地质大队

出　　处：《青海地质》1994年第1期4-14,共11页

摘　　要：东昆仑造山带是一个经历多期构造活动的复杂造山带,大致划分为昆北花岗岩浆弧带、昆中双型俯冲带、昆南混杂岩带。其地质特征反映了昆中断裂带在历次构造演化中的主导性。。晚元古代华北、华南两大古板块沿昆中断裂一线俯冲碰撞,为后期构造演化奠定了基础。晚古生代—中生代构造演化别具一格。经整体分析、现位恢复,具有泥盆—早二叠伸展滑覆、早二叠纪末—中三叠纪B型俯冲、中三叠纪末—早侏罗纪A型斜向俯冲三个演化阶段。Being a complex orogenic belt East Kunlun can be divided into three zones,i. e,theNorth Kunlun granomagmatic arcuate zone,the Central Kunlun Bi-type subduction zone and theSouth Kunlun melange zone. Geological characteristics of this region revealed that the CentralKunlun fault zone played a leading role in long tectonic evolution. The North China and. SouthChina plate subducted and collided along the Central Kunlun fault in Late Proterozoic so as to laya foundation for the subsequent tectonic evolution. Taking advantage of mass analysis and pre-sent-position reconstruction three evolution periods can be identified in Iate Palaeozoic-Mesozoictectonic.evolution,that is, stretchsliding-overlaped in Devonian-Early Permian, 'B' type subduc-tion in-Early Permian-Middle Triassic,and 'A'type oblique subduction in the End of Middle Tri-assic-Early Jurassic.

关 键 词：东昆仑 地质特征 构造演化 晚古生代 中生代 

分 类 号：P54[天文地球—构造地质学] P547[天文地球—地质学]