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

查看全文 作　　者：ZHU [1]Rixiang;SHAO Ji’[2]an;PAN [1]Yongxin;SHI [1]Ruiping;SHI [1]Guanghai;LI [3]Darning

机构地区：[1]Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China;[2]Department of Geology,Peking University,Beijing 100871,China;[3]Institute of Geology,China Seismological Bureau,Beijing 100029,China

出　　处：《Chinese Science Bulletin》索引2002年第47卷第21期,共6页

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 关键词：CRETACEOUS PALEOMAGNETISM geodynamics.

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

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