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《Chinese Journal of Geophysics》 2012-01
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A simulation study on the thermal structure of Manila trench subduction zone

GAO Xiang1,ZHANG Jian1*,SUN Yu-Jun1,WU Shi-Guo2 1 Key Laboratory of Computational Geodynamics,Graduate University of Chinese Academy of Sciences,Beijing 100049,China 2 Key Laboratory of Marine Geology and Environment in the Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071,China  
Numerical simulation study of thermal structure is a supplement to field observations and an important method to verify geodynamic models.In this study,based on geological and geophysical conditions,we construct two thermal models across the East Volcano Chain(EVC) and the West Volcano Chain(WVC) along the Manila trench subduction zone and do the thermal simulations using finite-element numerical method.During these simulations,we study the thermal structure of the subduction zones affected by the frictional and shear heating and simulate the thermal structure of the subduction zones beneath the seismic lines at EVC and WVC.We also employ the results of rock experiments to predict the regions of dehydration and partial melting in the subducting slab.The simulation results show that,at 100 km depth,at the slab interface with frictional and shear heating the temperature is 865 ℃,about 95 ℃ warmer than temperature without frictional and shear heating.Considering the frictional and shear heating,the temperatures at the slab interface are 865 ℃ and 895 ℃ and at the base of subducting oceanic crust are 560 ℃ and 605 ℃ at 100 km beneath the seismic lines of EVC and WVC.At slab surface,the depth of dehydration onset is less than 50 km.However,partial melting and dehydration may mainly occur at about 100 km depth,which is well associated to the observed location of the volcanic activity.
【Fund】: 国家自然科学基金项目(41174085);; 中国海陆地质地球物理系列图项目(GZH200900504);; 国家重点基础研究“973”课题(G2007CB411704 G2008CB425704)资助
【CateGory Index】: P542
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