辽北地区中朝地台与兴蒙地槽界线的商榷  

A DlSCUSSION OF THE BOUNDARY BETWEEN SINO──KOREAN PlATORM AND XINGGAN─MONGOLIA GEOSYNCLINE IN NOTHERN LIAONING

作　　者：杨森[1] 

机构地区：[1]沈阳地质矿产研究所

出　　处：《吉林地质》1994年第1期42-50,共9页Jilin Geology

摘　　要：在辽北地区，中朝地台与兴蒙地槽的界线为威远堡－西丰断裂。界北出露古生代下二台群，界南为元古宙“辽北辽河群”、泛河群和太古宙清原群。近期的研究表明，“辽北辽河群”系由蛇绿杂岩组成的古洋壳残片，其特征可与内蒙古温都尔庙群蛇绿岩相比较，而同辽东地区辽河群有着迥然差别，其时限为８５０～６００Ｍａ。为此，原来划定的地台、地槽界线将尺度南移至沙河断裂。今后对一系列的重大基础地质问题需要重新考虑和研究，尤其是对大地构造格架、成矿作用都会有新的启迪，对矿产预测亦将有重大的潜在意义。The boundary between the Sino-Korean platform and Xinggan-Mongolia geosyncline isthe Weiyuanpu-Xifeng fault in northern Liaoning. There is the Plaeozoic Xiaertai Group inthe north,and the Proterozoic the northern Liache Group, Fanhe group and the ArcheanQingyuan Group in the south. Recent research indicates that“N,Liaoning Liaohe Group”consists of paleo-oceaniccrust residue of ophiolite complex,and the formation time is 850-600 Ma. It can be comparedwith ophiolite of the Wenduermiao Group in Inner Mongolia, But it is utterly different fromthe Liaohe Group in eastern Liaoning. So the boundary between the platform and geosyncline should be moved southwardgreatly. Therefore,a series of significant basic geological problem need to be solved again,especially to the geotectonic framwork,geotectonic evolution and ore-forming process,therewill be a new enlightenment,and it will be of great signicance to the mineral prospecting.

关 键 词：地台 地槽界线 辽北地区 蛇绿杂岩 

分 类 号：P544.1[天文地球—构造地质学]