Late Mesozoic metamorphic core complexes: new constraints on lithosphere thinning in North China

Metamorphic core complexes (mcc's) are among the most prominent structural styles of lithosphere extension and thinning during late Mesozoic in North China. In this paper, the geometrical, kinematic and age characteristics of some of the mcc's, e.g.ric asymmetry, occurrence over a time span, scattered and isolated distribution, and progressive development, can provide direct constraints on the regional lithosphere extension and thinning in North China, which does not favor the prevailing plume model, a general delamination model or extensional collapse of overthickened orogenic crust. We argue that several aspects, such as the kinematic polarity at depths during lithosphere extension, gradual break-up of lithosphere plate, relationship between magmatism and regional extension, and coeval activity of mcc's and Tan Lu fault, should be taken into consideration when constructing a more reasonable model for lithosphere extension and thinning in North China.

作 者： LIU Junlai GUAN Huimei JI Mo HU Ling   作者單位： State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, and Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China  刊 名： 自然科學進展（英文版）  SCI 英文刊名： PROGRESS IN NATURAL SCIENCE  年，卷(期)： 2006 16(6)  分類號： N1  關鍵詞： North China   late Mesozoic   metamorphic core complex   lithosphere extension and thinning  

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