Collision Processes of North China and Siberian Plates: Evidence from LA-ICP-MS Zircon U-Pb Age on Deformed Granite in Xar Moron Suture Zone
LI Yi-long
ZHOU Han-wen
ZHONG Zeng-qiu
ZHANG Xiong-hua
LIAO Qun-an
GE Meng-chun
Abstract：The Fangkuangzigou granitic gneisses, extending with NEE trend along Fangkuangzi village in Linxi county, Inner-Mongolia province, are deformed and metamorphosed granites which intruded into the Shuangjing schists. The gneisses are nebulitic and homogeneous separately in its edge and center. The LA-ICP-MS zircon U-Pb dating method was applied to determine the ages of gneisses both from the edge and center. It is indicated that the magma emplacement initiated at about 271. 9±1. 6 Ma ago and intruded into Shuangjing schists, then migmatization and nebulitic structure were induced into the contact zones. The pluton was formed dominantly at 264. 8±1. 8 Ma ago. The pluton was deformed and metamorphosed into granitic gneiss by the collision betweenthe Siberian and North China plates. The collision was ended until 231±2Ma ago, then the Siberian and North China plates were finally converged.
Keywords：granitic gneisszirconLA-ICP-MS datinggeochronologyShuangjingInner-Mongolia.
Publication Date：2009-01-01
Pages：8( 931-938 )