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Tectonic evolution of the Dabieshan orogen: In the view from polyphase deformation of the Beihuaiyang metamorphic zone

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Science china Earth {1. 2005年第7期48卷 886-899页

作者： lin wei1,{1., {2. of geology and Geophysics, chinese academy of sciences, beijing 10002., china 2. Department of Earth and Planetary sciences, Graduate School of Science, Nagoya University, Japan 3. ISTO, UMR CNRS 61.3, Batiment Géosciences, Orléans Université d’Orléans, 45067 Orléans Cedex 2. France 4. UMR 652. "Magmas et Volcans", 5 Rue Kessler, 63000 Clermont-Ferrand, France 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 ISTO UMR CNRS 6113 Orléans Université d'Orléans 45067 Orléans Cedex 2 France UMR 652. Magmas et Volcans 63000 Clermont-Ferrand 5 Rue Kessler France

The Beihuaiyang metamorphic zone was formed by the Early Mesozoic collision of the North and South china Blocks. It consisted of the Fozi{1.g 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 geo- logical 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.

关键词： Beihuaiyang metamorphic zone geometry kinematic polyphase deformation tectonic evolution.

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Late Mesozoic compressional to extensional tectonics in the Yiwulshan massif,NE china and its bearing on the evolution of the Yinshan-Yanshan orogenic belt PartⅠ:Structural analyses and geochronological constraints

Late Mesozoic compressional to extensional tectonics in the ...

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中国科学院地质与地球物理研究所2.1.年度（第1.届）学术年会

作者： wei {1. {2. faure Yan Chen Wenbin Ji Fei wang {1. Wu nicolas Charles Jun wang qingchen wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Institut des sciences de la Terre d'Orleans UMR6113Universite d'Orleans-INSU/CNRS

With a cratonic nucleus,the North china Craton(NCC) experienced a complex tectonic evolution with multiphase compressional and extensional events during Mesozoic *** the northern part of the NCC,the Yinshan-Yanshan fold and thrust belt was a typical intraplate *** and Cretaceous continental sedimentation,magmatism,widespread intraplate characterize the Yinshan-Yanshan orogenic *** geodynamic significance of these tectonic events is still in *** the western part of the Liaoning province, the Yiwuliishan massif crops out at the eastern end of the Yinshan-Yanshan orogenic *** Yiwuliishan massif presents an elliptical domal shape with a NE-SW striking long *** structural evolution of this massif brings new insights for the understanding of the Mesozoic plutonic-tectonic history of the NCC.A multidisrip{1.ary study involving structural {2.,geochronology,Anisotropy of Magnetic Susceptibility(AMS) and gravity mode{1.g have been carried *** presentation of the new results splits into two *** 1.this paper) deals with field and laboratory structural observations,and presents the main geochronological *** AMS, gravity mode{1.g data will be provided in a companion paper(Part II).The early compressional deformation(D) corresponds to a Late Jurassic to Early Cretaceous southward *** subsequent deformation is related to the Early Cretaceous exhumation of the Yiwuliishan massif.A detailed structural analysis allows us to distinguish several deformation events(D,D,and D).The Cretaceous extensional structures,such as syntectonic plutons bounded by ductile normal faults,metamorphic core complexes,and half-graben basins are recognized in many places in East *** new data from the Yiwuliishan massif constitute a {1.k between Transbaikalia,Mongolia, North china and South china,indicating that NW-SE extensional Mesozoic tectonics occurred throughout the entire region.

关键词： North china Craton Yinshan-Yanshan fold and thrust belt Yiwul(u|¨)shan massif Structural analysis Polyphase deformations

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Late Mesozoic compressional to extensional tectonics in the Yiwul(u|¨)shan massif,NE china and their bearing on the Yinshan-Yanshan orogenic belt PartⅡ:Anisotropy of magnetic susceptibility and gravity mode{1.g

Late Mesozoic compressional to extensional tectonics in the ...

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中国科学院地质与地球物理研究所2.1.年度（第1.届）学术年会

作者： wei {1. {2. Charles Yan Chen Ke Chen michel faure {1. Wu Fei wang Qiuli Li Jun wang qingchen wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Universite d'Orleans ISTOUMR 7327.1A rue de la Ferollerie45071 OrleansFrance Universite d'Orleans

Granitoids play an important role in deciphering both crustal growth and tectonic evolution of *** the eastern end of the Yinshan-Yanshan belt of North china Craton,the Yiwuliishan massif is a typical region that presents the tectonic evolution features of this *** field work on the host rocks has demonstrated two phases of opposite tectonics:compressional and extensional,however,the deformation is almost invisible in the intrusive *** improve the understanding of the tectonic evolution of the Yiwuliishan massif and the Late Mesozoic tectonics of East Asia,a multidiscip{1.ary study has been carried *** this study,anisotropy of magnetic susceptibility(AMS) and gravity mode{1.g have been applied on these Jurassic plutons(Lüshan, Jishilazi and Guanyindong),which intrude into the Yiwulüshan *** to laboratory measurements and microscopic observations on thin sections,the AMS of the Yiwulüshan massif is characterized by secondary fabrics,indicating that the intensive post solidus deformation has reset the(primary) magmatic magnetic fabrics.A relatively gentle NW dipping magnetic foliation has been identified with two distinct groups of magnetic {1.eations of N34°E and N335°E orientations,namely L and L,*** mode{1.g reveals a southward thinning of the massif with a possible feeding zone rooted in the northern part of the *** all results from structural observation,geochronological investigation,AMS measurement and gravity mode{1.g,two tectonic phases have been identified in the Yiwulüshan massif,posterior to the Jurassic(1.0-1.0 Ma) magmatism in the Yinshan-Yanshan *** early one concerns a Late Jurassic-Early Cretaceous(-1.1.Ma) compressional event with a top-to-the-south to southwest sense of *** second one shows an Early Cretaceous(-1.6} Ma) NW-SE ductile extensional *** that time,sedimentary basins widened and Jurassic plutons started to be deformed under post solidus conditions. In fact,the

关键词： North china Craton Yinshan-Yanshan fold and thrust belt Yiwul(u|¨)shan massif Anisotropy of magnetic susceptibility Gravity modeling Late Mesozoic tectonic evolution

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