Our recent studies show that the lower crust and lithospheric mantle in the eastern North China Craton(NCC) wa...
Mingguo Zhai~(a,b,d,*),Qicheng Fan~c,Hongfu Zhang~(a,d),Jianli Sui~a,Ji'an Shao~e a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China b Key Laboratory of Mineral Resources.Chinese Academy of Sciences,Beijing,100029,China c Institute of Geology,Chinese Seismological Bureau.Beijing,100029,China d State Key Laboratory of Lithosphere Tectonic Evolution,Beijing,100029,China c School of Earth and Space Sciences,Peking University,Beijing,100871,China
An important tectonic inversion took place in eastern North China Block(NCB) during Mesozoic, which caused a great lithosphere thinning, reconstruction of basin-range series, powerful interaction between mantle and crust, a vast granitic intrusion and volcanism, and large-scale metallogenic explosion. The time range of the Mesozoic tectonic regime inversion in the eastern North China Block is one of the key issues to understand mechanism of tectonic regime inversion. Our updated results for recognizing the time range are mainly obtained from the following aspects: structural analyses along northern and southern margins of the NCB and within the NCB for revealing tectonic inversion from compression to extension and structural striking from ~EW to NNE; geothermic analyses of the eastern sedimental basins for a great change of thermal history and regime; basin analysis for basin inversion from compression to extension and basin migration from ~EW to NNE; petrological and geochemical studies of volcanic rocks and lowermost crust xenoliths for recognizing peak period of mantle upwelling and intense interaction between mantle and crust, and main metallogenic epoch. All the studies of the above give the same time range from~150-140 Ma to ~110-100Ma, peaking at ~120 Ma.
Considerable debate on whether and how the Sulu Orogenic Belt extends eastward to the Korean Peninsula has rem...
Mingguo Zhai~(a,b,*),Jinghui Guo~(a,b),Zhong Li~a,Daizhao Chen~a,Peng Peng~a,Tiesheng Li~a, Quanlin Hou~c,Qicheng Fan~d a Institute of Geology and Geophysics,and Key Laboratory of Mineral Resources,Chinese Academy of Sciences,Beijing,100029,China b Chinese State Key Laboratory of Lithosphere Evolution,China c Graduate University,Chinese Academy of Sciences,China d Institute of Geology,Chinese Seismological Bureau,China
A major slip and thrust belt within the eastern Jiaodong Peninsula is located at the eastern terminal of the Qinling-Dabie-Sulu orogenic belt between the Sino-Korea Block and Yangtze Block. Although a lot of isotope chronologic data have been obtained regionally, little structural chronological research has been conducted in this region and this paper corrects that. Syn-deformational minerals were system-atically selected from samples of the NE-ENE trending transpressional shear zones and transpres-sional nappes and carefully analysed using 40Ar/39Ar methods. Two tectonic events were defined with the first event resulting from early movement of transpressional nappes around 190 Ma ago. This ac-cords with the period of syn-orogenic sinistral slip of the Tan-Lu faults and clockwise shear in the Eastern Qinling-Tongbaishan part of the Qinling-Dabie-Sulu orogenic belt. The second event involved strikeslip thrust movement of deep shear zones between 130Ma and 120Ma. This resulted from the onset of Mesozoic tectonic conversion in the eastern Jiaodong Peninsula. The sinistral strikeslip-thrusting in Jiaodong Peninsula and the extensional tectonism (toward ESE) in Liaodong Peninsula probably resulted in the clockwise rotation of Korea Peninsula in late Mesozoic.
ZHANG HongYuan1,2, HOU QuanLin3 & CAO DaiYong 4 1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
