Dissipation of fast strike-slip faulting within and beyond northeastern Tibet

Structural patterns, global positioning system (GPS) velocities, and Quaternary fault slip rates in northeastern Tibet indicate a transfer of left-lateral slip from the Kunlun fault northeast to the Haiyuan fault and minor crustal shortening and rotation within a 200-km-wide stepover zone. Related deformation also continues at least a few hundred kilometers north of the Haiyuan fault into a region of diffuse extensional(?) shear or rotation underlain by average thickness crust. Fast, localized slip along the central Kunlun fault transforms into distributed deformation across a 500-km-wide zone where the lower crust is weak. The distribution of fault-parallel GPS velocities across this region suggests a decrease in fault slip toward eastern fault tips and progressive dissipation of slip to the north rather than east of the Tibetan Plateau as previously suggested.

[1]  M. Caffee,et al.  Fast late Pleistocene slip rate on the Leng Long Ling segment of the Haiyuan fault, Qinghai, China , 2002 .

[2]  Marie-Pierre Doin,et al.  Measurement of interseismic strain across the Haiyuan fault (Gansu, China), by InSAR , 2008 .

[3]  G. Peltzer,et al.  Present‐day kinematics of Asia derived from geologic fault rates , 1996 .

[4]  Roy K. Dokka,et al.  Late Cenozoic strike-slip faulting in the Mojave Desert, California , 1990 .

[5]  Bertrand Meyer,et al.  Partitioning of crustal slip between linked, active faults in the eastern Qilian Shan, and evidence for a major seismic gap, the ‘Tianzhu gap’, on the western Haiyuan Fault, Gansu (China) , 1995 .

[6]  G. Mandl.  Tectonic deformation by rotating parallel faults: the bookshelf mechanism , 1987 .

[7]  R. Freund.  Kinematics of transform and transcurrent faults , 1974 .

[8]  M. Caffee,et al.  Uniform postglacial slip-rate along the central 600 km of the Kunlun Fault (Tibet), from 26Al, 10Be, and 14C dating of riser offsets, and climatic origin of the regional morphology , 2002 .

[9]  P. R. Cobbold,et al.  Propagating extrusion tectonics in Asia: New insights from simple experiments with plasticine , 1982 .

[10]  J. C. Savage,et al.  Geodetic determination of relative plate motion in central California , 1973 .

[11]  A. Sylvester.  Strike-slip faults , 1988 .

[12]  Lothar Ratschbacher,et al.  Lateral extrusion in the eastern Alps, PArt 2: Structural analysis , 1991 .

[13]  M. Caffee,et al.  Uniform slip‐rate along the Kunlun Fault: Implications for seismic behaviour and large‐scale tectonics , 2000 .

[14]  Wayne Thatcher,et al.  Microplate model for the present-day deformation of Tibet , 2007 .

[15]  Bertrand Meyer,et al.  Oblique Stepwise Rise and Growth of the Tibet Plateau , 2001, Science.

[16]  A. Şengör,et al.  Strike-Slip Faulting and Related Basin Formation in Zones of Tectonic Escape: Turkey as a Case Study , 1985 .

[17]  B. Burchfiel,et al.  Amount and style of late Cenozoic deformation in the Liupan Shan area, Ningxia autonomous region, China , 1991 .

[18]  B. Burchfiel,et al.  Late Cenozoic Right-Lateral Movement along the Wenquan Fault and Associated Deformation: Implications for the Kinematic History of the Qaidam Basin, Northeastern Tibetan Plateau , 2004 .

[19]  E. Kirby,et al.  Slip rate gradients along the eastern Kunlun fault , 2007 .

[20]  Brendan J. Meade,et al.  Present-day kinematics at the India-Asia collision zone , 2007 .

[21]  P. Molnar,et al.  Right-lateral shear and rotation as the explanation for strike-slip faulting in eastern Tibet , 1990, Nature.

[22]  Eric Cowgill,et al.  Impact of riser reconstructions on estimation of secular variation in rates of strike-slip faulting: Revisiting the Cherchen River site along the Altyn Tagh Fault, NW China , 2007 .

[23]  L. Royden,et al.  Crustal rheology and faulting at strike‐slip plate boundaries: 2. Effects of lower crustal flow , 2000 .

[24]  Robert W. King,et al.  Global Positioning System measurements from eastern Tibet and their implications for India/Eurasia intercontinental deformation , 2000 .

[25]  Bertrand Meyer,et al.  Crustal thickening in Gansu‐Qinghai, lithospheric mantle subduction, and oblique, strike‐slip controlled growth of the Tibet plateau , 1998 .

[26]  B. Burchfiel,et al.  Geology of the Haiyuan Fault Zone, Ningxia‐Hui Autonomous Region, China, and its relation to the evolution of the Northeastern Margin of the Tibetan Plateau , 1991 .

[27]  Leigh H. Royden,et al.  Topographic ooze: Building the eastern margin of Tibet by lower crustal flow , 2000 .

[28]  P. Molnar,et al.  Cenozoic Tectonics of Asia: Effects of a Continental Collision: Features of recent continental tectonics in Asia can be interpreted as results of the India-Eurasia collision. , 1975, Science.

[29]  M. Caffee,et al.  Holocene left-slip rate determined by cosmogenic surface dating on the Xidatan segment of the Kunlun fault (Qinghai, China) , 1998 .

[30]  Frederick J. Ryerson,et al.  Postglacial left slip rate and past occurrence of M≥8 earthquakes on the Western Haiyuan Fault, Gansu, China , 1999 .

[31]  Peizhen Zhang,et al.  Present‐day crustal motion within the Tibetan Plateau inferred from GPS measurements , 2007 .

[32]  Robert W. King,et al.  Independent active microplate tectonics of northeast Asia from GPS velocities and block modeling , 2006 .

[33]  Peizhen Zhang,et al.  Late Quaternary left‐lateral slip rate of the Haiyuan fault, northeastern margin of the Tibetan Plateau , 2009 .