Permian Alkaline Granites in Central Inner Mongolia and Their Geodynamic Significance

作     者：Hong Dawei, Huang Huaizeng, Lithosphere Research Center, Chinese Academy of Geological Sciences, BeijingXiao Yijun, Institute of Geology, Chinese Academy of Geological Sciences, BeijingXu Haiming,Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijingand Jin M anyuanTianjin Geological Academy, Ministry of Metallurgical Industry, Tianjin Fei Zhenbi 

作者机构：Lithosphere Research Center Chinese Academy of Geological Sciences Beijing China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：1995年第69卷第1期

页      面：27-39页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This study was the project No. 48970104 supported jointly by the National Natural Scinece Foundation of China the Chinese Foundation for Development of Geological Science and Technology This paper was presented at the 29 th IGC held in Kyoto in August 

主　　题：alkaline granite geodynamics Inner M ongolla 

摘      要：Alkaline granites (Rb-Sr ages 276-286 Ma)occurring in the Bayan Ul-East Ujimqin belt at the southern margin of the Siberian plate originated in a tensional tectonic environment about 60 Ma earlier than the Late Devonian to Early Carboniferous collision between the Siberian and Sino-Korean plates. They belong to post-orogenic A-type granites and may be used as an indicator of the end of the orogeny. At the northern margin of the Sino-Korean plate, however, only late-orogenic calc-alkaline granites occurred during the late Caboniferous-Permian, and alkaline syenites did not appear until the Late Triassic. The asymmetric magmatism at the margins of the two neighbouring plates might be controlled by the differences in size and mass of the two plates.