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Paleomagnetic data from Early Cretaceous volcanic rocks of West Liaoning:Evidence for intracontinental rotation

Paleomagnetic data from Early Cretaceous volcanic rocks of West Liaoning: Evidence for intracontinental rotation

作     者:ZHU Rixiang SHAO Ji’an PAN Yongxin SHI Ruiping SHI Guanghai LI Darning 

作者机构:Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100101China Department of GeologyPeking UniversityBeijing 100871China Institute of GeologyChina Seismological BureauBeijing 100029China 

出 版 物:《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期:2002年第47卷第21期

页      面:1832-1837页

核心收录:

学科分类:070903[理学-古生物学与地层学(含:古人类学)] 0709[理学-地质学] 07[理学] 

主  题:Cretaceous paleomagnetism geodynamics. 

摘      要:Detailed rock magnetic studies of 55 lavas from Yixian and Fuxin area, West Liaoning, show the primary carriers of remanence to be pseudo-single domain ti-tanomagnetite. K/Ar dating indicates that the volcanic sequence spans 93 to 133 Ma. Stepwise thermal demagnetization successfully isolated well-defined characteristic magnetization (ChRM) in all lavas thermal-treated above 250℃ The mean paleodirections are D/I=5.9°/58.8° (α95 = 2.9°) and D/I =179.2°/-59.9° (α95 = 5.2°) for 27 normally magnetized flows and 28 reversibly magnetized flows, respectively. It indicates that since the Early Cretaceous there is no significant horizontal movement and rotation between the Yixian-Fuxin area and Eurasia. However, Korea Peninsula may have undergone a clockwise rotation of 33.9° relative to the Yixian-Fuxin area during the Cretaceous. On the basis of characteristics of hotspot origins (core-mantle boundary or upper mantle), the clockwise rotation of Korea Peninsula relative to Eurasia is assumed to be

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