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《Chinese Journal of Geophysics》 2016-09
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East Kunlun Orogeny′s uplift uncovered by deep reflection seismic data in INDEPTH Ⅳ

LIU Zhi-Wei;ZHAO Wen-Jin;WU Zhen-Han;SHI Da-Nian;SONG Yang;DENG Shi-Guang;Chinese Academy of Geological Sciences;Institute of Mineral Resources,Chinese Academy of Geological Sciences;  
A great challenge in INDEPTH Ⅳ′s deep-reflection seismic processing is to deal with nearsurface statics and noise attenuation,and a seismic profile with high signal-noise-ratios has been obtained by means of first-break refraction residual statics,abnormal amplitude noise suppression and CRS stacking.The new interpreted profile uncovers that the upper crust of East Kunlun Orogenic belt obviously possess dynamical characteristics of compressional strike-slips and fault-propagation folds,Songpan-Garzêancient oceanic crust′s reflection discontinuously exists between the upper and lower crusts of lithosphere,and abnormal low-frequency reflectionresponses may attribute to a partially molten block with lower-velocity and high-conductivity properties.INDEPTH Ⅳ′s seismic profiles and other geophysical data prove that the complex uplift process in East Kunlun orogeny experienced twice principal-stage deformations at least,first deformed in one northern subduction of Songpan-GarzêOcean during the Triassic period and second triggered by a compressional stress from Qiangtang Block moving northward since Cenozoic era.Finally,based on INDEPTH Ⅳ′s shot gathers,velocity and stacking profiles presently interpreted,a new uplifting model comes forward to enhance much knowledge to east Kunlun Orogenic belt.
【Fund】: 中国地质调查局项目“青藏高原深部过程与资源环境效应研究”(1212011220903);; 美国自然科学基金委员会(NSF);; 德国GFZ地学研究中心联合资助
【CateGory Index】: P542;P315
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