Tectonic Landform of Quaternary Lakes and Its Implications for Deformation in the Northern Qinghai-Tibet Plateau |
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| Authors: | WANG An WANG Guocan LI Dewei XIE Defan LIU Demin Faculty of Earth Sciences China University of Geosciences Wuhan Hubei China State Key Laboratory of Geological Processes Mineral Resources China |
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| Abstract: | The Hohxil region in the northern Qinghai-Tibet Plateau is occupied by numerous plateau lakes.which have long been inferred as being tectonic products.However, SO far little evidence has been found to support this tentative inference.Field survey and morphotectonic analysis of TM satellite images in the eastern segment of the Hohxil region revealed that Kusai Lake and Yelusu Lake are S-shaped pull-apart basins.which were dominated by left strike-slip master faults trending WNW-ESE. The pull-apart distances of the two Iakes are analyzed to be<15-20 km and 15 km respectively.Based on studies of the faulting rate.the initiation ages of the pull-apart basins are suggested to be approximately in the Early Pleistocene.The pull-apart basin tectonics iS further regarded as a common mechanism for the widely distributed large lake basins in the northern Qinghai-Tibet Plateau.Regional distribution of these pull-apart basins and their substantial intra-block slip suggest that a sinistral shear stress,which is independent of the distinguished strike-slip faults,has been imposed on across the northern Qinghai-Tibet Plateau.Thus.the intra-block slip may be an important expression of the eastward extrusion of the Plateau crustal materiaI in accommodating the ongoing continent-continent convergence between India and Eurasia.The revelation of pull-apart tectoniCS within the Plateau hinterland provides field evidence and a possible style of deformation for the newly proposed continuous deformation by the global positioning system(GPS)measurement across the northern Qinghai-Tibet Plateau.A model, with respect to systematic tectonic landforill development, for pull-apart basins is ffmally proposed. |
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| Keywords: | lake pull-apart basin Quaternary tectonic landform Qinghai-Tibet Plateau |
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