摘要
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.
A major slip and thrust belt within the eastern Jiaodong Peninsula is locatedat the eastern terminal of the Qinling-Dabie-Sulu orogenic belt between the Sino-Korea Block andYangtze Block. Although a lot of isotope chronologic data have been obtained regionally, littlestructural chronological research has been conducted in this region and this paper corrects that.Syn-deformational minerals were systematically selected from samples of the NE-ENE trendingtranspressional shear zones and transpres-sional nappes and carefully analysed using ^(40)Ar/^(39)Armethods. Two tectonic events were defined with the first event resulting from early movement oftranspressional nappes around 190 Ma ago. This accords with the period of syn-orogenic sinistralslip of the Tan-Lu faults and clockwise shear in the Eastern Qinling-Tongbaishan part of theQinling-Dabie-Sulu orogenic belt. The second event involved strikeslip thrust movement of deep shearzones between 130Ma and 120Ma. This resulted from the onset of Mesozoic tectonic conversion in theeastern Jiaodong Peninsula. The sinistral strikeslip-thrusting in Jiaodong Peninsula and theextensional tectonism (toward ESE) in Liaodong Peninsula probably resulted in the clockwise rotationof Korea Peninsula in late Mesozoic.
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
基金
Supported by the National Natural Science Foundation of China (Grant No. 40234050)
the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KZCX1-07)
