Slip Rate Determination of Thrusts Along the Edge of NE Tibet From in situ-Produced Cosmogenic Nuclides

HR: 1340h
AN: U33A-0015 [Abstracts]
TI: Slip Rate Determination of Thrusts Along the Edge of NE Tibet From in situ-Produced Cosmogenic Nuclides
AU: Hetzel, R
EM: rahetzel@uni-muenster.de
AF: Geologisch-Palaeontologisches Institut, Universitaet Muenster, Correnstr. 24, Muenster, 48149 Germany
AU: Niedermann, S
EM: nied@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473 Germany
AU: Tao, M
EM: Lmtao@ns.lzb.ac.cn
AF: State Key Laboratory of Gas-Geochemistry, Chinese Academy of Sciences, Lanzhou, 730000 China
AU: Ivy-Ochs, S
EM: ivy@phys.ethz.ch
AF: Institute of Particle Physics, ETH H”nggerberg, Zurich, 8093 Switzerland
AU: Stokes, S
EM: stephen.stokes@geog.ox.ac.uk
AF: School of Geography, University of Oxford, Oxford, OX1 3TB United Kingdom
AU: * Strecker, M R
EM: strecker@geo.uni-potsdam.de
AF: Institut fr Geowissenschaften, Universitaet Potsdam, Golm, 14476 Germany
AU: Kubik, P W
EM: kubik@phys.ethz.ch
AF: Paul Scherrer Institut, c/o Institute of Particle Physics, ETH H”nggerberg, Zurich, 8093 Switzerland
AB: The Qilian Shan forms a seismically active fold-and-thrust-belt along the NE margin of the Tibetan Plateau that evolved during the Neogene-Quaternary and continues to advance north-northeastward (Meyer et al., 1998; Tapponnier et al., 2001). Active thrust faults transecting Late Pleistocene alluvial fan deposits form spectacular fault scarps that are locally incised by rivers which form flights of terraces. By combining structural investigations, satellite imagery, topographic profiling, surface exposure, and luminescence dating we have determined slip rates for several thrust faults (Hetzel et al. 2002, 2004a,b). Our results are consistent with geologic and GPS constraints, which suggest that NNE-directed shortening across the northeastern Tibetan Plateau is distributed on several active faults with a total shortening rate of about 4 to 10 mm/yr. References Hetzel, R., S. Niedermann, M. Tao, P.W. Kubik, S. Ivy-Ochs, B. Gao, M.R. Strecker (2002a), Nature, 417, 428-432. Hetzel, R., M. Tao, S. Niedermann, M.R. Strecker, S. Ivy-Ochs, P.W. Kubik, B. Gao (2004a), Terra Nova 16, 157-162. Hetzel R., M. Tao, S. Stokes, S. Niedermann, S. Ivy-Ochs, G. Bo, M.R. Strecker, P.W. Kubik (2004b), Tectonics 23, TC6006, doi:10.1029/2004TC001653. Meyer, B., P. Tapponnier, L. Bourjot, F. M‚tivier, Y. Gaudemer, G. Peltzer, G. Shunmin, C. Zhitai (1998), Geophys. J. Int., 135, 1-47. Tapponnier, P., Z. Xu, F. Roger, B. Meyer, N. Arnaud, G. Wittlinger, J. Yang (2001), Science, 294, 1671-1677.
DE: 1150 Cosmogenic-nuclide exposure dating (4918)
DE: 8002 Continental neotectonics (8107)
DE: 8004 Dynamics and mechanics of faulting (8118)
DE: 8175 Tectonics and landscape evolution
DE: 8177 Tectonics and climatic interactions
SC: Union [U]
MN: Fall Meeting 2005