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《Chinese Geology》 2002-03
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Structure and dynamics of lithosphere and asthenosphere in the gigantic East Asian-West Pacific rift system

CAI Xue-lin 1 ,ZHU Jie-shou 2 ,CAO Jia-min 2 ,YAN Zhong-qiong 2 ,YANG Zheng-xi 1 ,HONG Xue-hai 2,3(1.Institute of Earth Sciences,Chengdu University of Technology,C hengdu610059,Sichuan,China2.Department of Geophysics,Chengdu Univers ity of Technology,Chen  
Based on the seismic S-wave tomography,the authors carried out a systematic study of the speed structures of the lithosphere and asthenospher e of Eurasia and the West Pacific,and found a gigantic low-velocity anomaly z one between East Asia and the West Pacific.According to this discovery,combine d with the tectonic,mantle petrological and geochemical characteristics,as wel l as other geophysical features,a mega-rift system is defined in the region.T he3D seismic Vs speed structures of the lithosphere and as-thenosphere are v ery similar to those of the Mid-Pacific,Mid-Atlantic,and Mid-Indian ridges and their neighboring regions ,but notably different from those of the pres ent plate subduction zone on the East Pacific margin.On the basis of a furth er discussion on the dynamic characteristics of this re gion,it is con-cluded that the rift system resulted from the massively active extensional deformation and strong delamina-tion and thinning of the lithosphere,formation of large rift basins ,and upwelling and heating of a large amount of the asthenosphe ric substances since the Mid-Late Mesozoic.Marginal seas developed on the basi s of the continental rift system,and the main extension stage is determined to be from the middle Oligocene to middle Miocene(32-13Ma ).The extensions of these marginal seas had ended after the peri-od from17to15Ma ;as a r esult not all of the seas were connected with the mid-ocean ridges.Four sta ges of the tectonic-deformational dynamic evolution may be distinguished,and it is considered that the tectonic superposition of interactions of various neighboring plates resulted in the formation of the continen-tal rifts,margin al seas,and trench-arc-basin systems between present East Asia and the West Pacific since the Mid-Late Cenozoic.
【Fund】: 国家自然科学基金重点项目(49734150);; 国土资源部专项计划(20001010)
【CateGory Index】: P31
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