西拉木伦河北岸新发现地质资料及其构造意义

Geological Information Were Discovered and Their Plate Tectonic Significance on the Northern Bank of Xarmoron River

在内蒙古赤峰北部双井及其附近地区进行１／５万区调过程中，于西拉木伦河北岸发现了一些重要的地质资料：双井古陆及其物质组成；早二叠世早期复理石建造；石炭纪一早二叠世早期的蛇绿岩及其构造侵位；侵位于双井古陆的早二叠世同碰撞Ⅰ型、Ｓ型二长花岗岩；早二叠世晚期的磨拉石建造；早二叠世末西拉木伦河断裂带的韧性右行走滑及小苇塘岩片的构造侵位等。这些资料为加深对西拉木伦河断裂带的认识提供了可靠的依据。从而认为西拉木伦河断裂带为古蒙古洋板块与中朝板块最终碰撞缝合的位置。

On the northern bank of Xarmoron River,some important geological information were discovered during 1∶50000 of regional geological surveying at Shuangjing and it’s peripheral area in the northern side of Chifeng Inner Monglia. They include Shuangjing old massif and it’s compsition;Early early Permian Epoch flysch formation;Carboniferous period-early early Permian Epoch ophiolites and their tectonic emplacement;Early Permian Epoch synchronic collisional I-type and S-type monzonitic granite that emplaced Shuangjing old massif;Late early Permian Epoch molasse formation;Ductile right-lateral slip of Xarmoron River fracture zone and tectonic emplacement of Xiao Weitang lithosheet at the end of early Permian Epoch,et.The above information provide us believable evidence that we understand the Xarmoron River fracture zone deeply.So,we consider the Xarmoron river fracture zone as the collisional sutural situation between the old Monglia Ocean and the Sino-Korean plates at the end of early Permian Epoch.