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Tectono-chronologic constraints on a Mesozoic slip and thrust belt in the eastern Jiaodong Peninsula

Science China Earth Sciences 2007年第1期50卷 25-32页

作者： ZHANG HongYuan1,2, HOU QuanLin3 & CAO DaiYong 4 1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China 3 Graduate School of China Acacemy of Sciences, Beijing 100039, China 4 Key Laboratory of Coal Resources (CUMT), Ministry of Education, Beijing 100083, China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Graduate School of China Acacemy of Sciences Beijing 100039 China Key Laboratory of Coal Resources (CUMT) Ministry of Education Beijing 100083 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.

关键词： the eastern Jiaodong Peninsula tectono-chronology 40Ar/39Ar strikeslip and thrust belt.

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