Mesozoic doming extensional tectonics of Wugongshan, South China

作     者：舒良树 孙岩 王德滋 M.Faure P.Monie J.Charvet 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：1998年第41卷第6期

页      面：601-608页

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (GrantNos.4 96 32 0 80 4 95 72 14 1) 

主　　题：extensional tectonics granitic dome kinematic analysis Mesozoic Wugongshan. 

摘      要：Wugongshan in Jiangxi Province, China was a Mesozoic granitic dome-type extensional tectonics that is composed of metamorphic core complexes, ductile and brittle shear-deformed zones distributed around Mesozoic granites. Within it, the foliation defines an E-W elliptical shape and bears S-N stretching lineations. The axial part is located in Hongjiang-Wanlongshan area and occupied by oriented granites with coaxial symmetric shear fabrics. The southem and northern flanks, including rocks in the Anfu Basin to the south and the Pingxiang Basin to the north, display top-to-south and top-to-north motions, respectively. The ductile and brittle structures indicate a geometric and kinematic consistency. The extensional tectonics is developed on a Caledonian metamorphic basement and is unconformably covered by Late Cretaceous red beds. Isotopic ages on muscovite, biotite and whole rock by40Ar-39Ar, K-Ar and Rb-Sr suggest that the Wugongshan extensional doming began from the Triassic and ended in the Late Cretaceous. A geodynamic model is discussed.