Tectonic evolution of the Dabieshan orogen: In the view from polyphase deformation of the Beihuaiyang metamorphic zone
The Beihuaiyang metamorphic zone was formed by the Early Mesozoic collision of the North and South China Blocks. It consisted of the Foziling and Luzhenguan complexes and was thought to have never afforded a deep subduction. A similar feature of the deformation in the Dabieshan UHP metamorphic rocks implies that these different tectonic units share the same geodynamic background. The early stage of deformation can be preserved on account of their relatively shallower subduction than that for UHP rocks. On the basis of an analysis of the geological structure and geochronological results, five deformational stages have been recognized: a D1-Early compressional deformation which represents the continental subduction; a D2-Early exhumation deformation producing a syn-convergence exhumation; a D3-Main deformation, represented by an exhumation deformation with Late Triassic age; a D4-Doming and its margin extensional gravity collapse deformation and finally a D5-regional extensional deformation of Cretaceous that was mostly introduced by the migmatization and plutonism.
作 者： LIN Wei Faure Michel WANG Qingchen Arnaud Nicolas 作者单位： LIN Wei(LTE,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University,Japan)Faure Michel(ISTO, UMR CNRS 6113, Batiment Géosciences, Orléans Université d'Orléans, 45067 Orléans Cedex 2, France)
WANG Qingchen(LTE,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)
Arnaud Nicolas(UMR 6524 "Magmas et Volcans", 5 Rue Kessler,63000 Clermont-Ferrand,France)
刊 名： 中国科学D辑（英文版） SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES) 年，卷(期)： 2005 48(7) 分类号： P5 关键词： Beihuaiyang metamorphic zone geometry kinematic polyphase deformation tectonic evolution