Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Geoscience》 2008-02
Add to Favorite Get Latest Update

Cenozoic Lithosphere Tectonic Detachments,Magmatism and Earthquake in Eastern China

WANG Ya-mei 1,WAN Tian-feng 2,3(1.School of Earth and Space Sciences,Peking University,Beijing 100871,China;2.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;3.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China)  
It is a suitable method to roughly determine partial detachment in lithosphere or at the bottom of lithosphere,used by data of magmatic source depth at strong magmatism areas in eastern China.In the North Sinian stage(Eocene-Oligocene),partial tectonic detachments mainly occurred at the intersection among the bottom of lithosphere and pre-existing NW or N-E and NNE striking lithospheric faults.In the Himalayan stage(Miocene-Early Pleistocene),detachments widely occurred at the intersection among the bottom of lithosphere and three NE and NNE trending lithospheric faults(Taihangshan,Tan-Lu and southeast coastal of China).In the Neotectonic stage(since Middle Pleistocene) according to the seismic data,detachments mainly occurred near Moho discontinuity and intermediate crust,with sheety-like,but not in south China.The recent gravity gradient zone is the division line between continental and oceanic lithosphere mantle,also indicates the division of the strong and weak area of magmatism,migrating eastwards at most about 200 km,compared with that from Cretaceous to present.Therefore,the authors suggested that tectonic detachment was occurred by main brench faults,and the type,characteristics and distribution of magmatic rocks and earthquakes were controlled by the detachments,occurred at the intersection area of the faults and different tectono-spheres in the lithosphere.Neither mantle plume nor hot magma uplifting widely existed,and no large-scale extension-thinning process occurred in eastern China lithosphere during Cenozoic.
【Fund】: 国家自然科学基金项目(40674046)
【CateGory Index】: P315.2
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved