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《Chinese Journal of Geophysics》 2013-11
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Deep subducting slab reconstruction and its geometry,kinematics:a case study for the Tonga-Kermadec slab from tomography

LU Ren-Qi;SUPPE John;HE Deng-Fa;WU Jonny;Ravi V S Kanda;LIU Bo;CHEN Yue-Gau;School of Earth and Space Science,Peking University;The Department of Geosciences,National Taiwan University;College of Energy Resources,China University of Geosciences;  
The Tonga-Kermadec subdction zone between the southwest Pacific Plate and the Australian Plate is one of the key regions to the Geodynamics research.In this paper,in order to map the 3-D geometries of subducting slabs,the MIT-P08seismic tomography dataset have been add to the GOCAD software by integrating with tectonic boundaries,earthquakes and coastlines.The tomography shows there are three anomalously fast regions in the mantle beneath the TongaFiji area.The Tonga-kermadec slab have subducted into the mantle transition zone and penetratedinto the lower mantle.The maximum subducted depth is about 1600km.3-D structural model reveals the Tonga-kemadec slab is faulting and folding at 600~800km depth.After the subducting slab is unfolding and restoration,measuring its maximum subducted displacement nearly 2600km.The results indicate that the Tonga-kemadec slab subducted before 30Ma at least with the average rates of 68~104mm/a.Reconstruction and recovery of the 3-D slab can reveal the detailed geometry and the kinematics of subducting slab,which is providing the constraints to the deep earthquakes,the deep earth processes and dynamic mechanism.
【Fund】: 国家自然科学基金(40739906 41202142);; 国家科技重大专项(2011ZX05005-003-004);; 博士后科学基金(2012M520120 2013T60027)联合资助
【CateGory Index】: P542
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