Structure and Evolution of the Early Cretaceous Dabieshan Metamorphic Core Complex

详细信息   

• 责任者：Ji Wenbin (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Lin Wei
• 刊名：Chinese Journal of Geology
• 出版年：2011
• 卷期：46(1)
• 关键词：变质核杂岩 ; metamorphic core complexes ; 大别山 ; Dabie Mountains
• 页码：p.161-180
• 图表：6 illus., 93 refs.
• 分类号：0300
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

Based on the structural analysis of the core complex as well as its boundary shear zones or fracture zones and associated with a comprehensive review of the relative studies, the authors define this migmatite-gneiss dome as a metamorphic core complex（MCC） developed during 145 ~ 120 Ma.  Comparing with the extension tectonics in the East China, the authors propose that the occurrence of the Dabieshan MCC was the combined effects of three different geological processes in different levels: the gravitational collapse and delamination of the orogenic root, the ductile flow of the middle-lower crust towards SE and the detachment and unroofing of the hanging wall, which shares the same tectonic settings as the destruction of the North China Craton under the Late Mesozoic regional extension in East China.