扬子地块西北缘晋宁期板块构造的探讨  

PLATE TECTONI-CSOF THE NORTHWESTERN MARGIN OF THE YANGZI MASSIF IN JIN NING PERIOD

作　　者：李建林[1] 

机构地区：[1]中国科学院广州地质新技术研究所

出　　处：《矿物岩石》1989年第1期1-6,共6页Mineralogy and Petrology

摘　　要：扬子地块西北缘在前寒武纪是否存在板块俯冲活动,这一个争议的重大地质问题?笔者根据多年对本区前寒武纪地层,岩浆活动、蛇绿岩套、沉积建造及深断裂带等方面的研究,初步认为扬子地块西北缘在晋宁造山期(1050—850Ma)曾有过板块俯冲活动。其活动模式:西北方向的青康滇古大洋板块向东南的扬子古微型大陆板块俯冲,结果在扬子地块西北缘康滇山系—龙门山—米仓山一带形成海沟——活动大陆边缘山弧系。Whether the plate subduction activities occurred in Precambian in the northwestern margin of the Yangzi Massif has always been an important geological question in dispute.Based on many years study of stratigraphy, magmatic formation, ophiolitic suites, sedimentary formation and deep fractures of Precambian in this area, it is suggested that plate subduction did take place during the Jinning orogenic period (1050-850Ma ) , The Qinghai-Xikang-Yunnan oceanic paleo-plate subducted toward the Yangzi continental Paleo-microplate,forming volcanic are and trench systems of Kangdian-Longmen-Micang Mountains along the northwestern margin of the Yangzi massif,

关 键 词：板块构造 杨子地块 

分 类 号：P541[天文地球—构造地质学]