Lease, Richard O. and Burbank, Douglas W. and Clark, Marin K. and Farley, Kenneth A. and Zheng, Dewen and Zhang, Huiping (2011) Middle Miocene reorganization of deformation along the northeastern Tibetan Plateau. Geology, 39 (4). pp. 359-362. ISSN 0091-7613 http://resolver.caltech.edu/CaltechAUTHORS:20110412-115452319
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Temporal variations in the orientation of Cenozoic range growth in northeastern Tibet define two modes by which India-Asia convergence was accommodated. Thermochronological age-elevation transects from the hanging walls of two major thrust-fault systems reveal diachronous Miocene exhumation of the Laji-Jishi Shan in northeastern Tibet. Whereas accelerated growth of the WNW-trending eastern Laji Shan began ca. 22 Ma, rapid growth of the adjacent, north-trending Jishi Shan did not commence until ca. 13 Ma. This change in thrust-fault orientation refl ects a Middle Miocene change in the kinematic style of plateau growth, from long-standing NNE-SSW contraction that mimicked the plate convergence direction to the inclusion of new structures accommodating east-west motion. This kinematic shift in northeastern Tibet coincides with expansion of the plateau margin in southeastern Tibet, the onset of normal faulting in central Tibet, and accelerated shortening in northern Tibet. Together these phenomena suggest a plateau-wide reorganization of deformation.
|Additional Information:||© 2011 Geological Society of America. Received 2 May 2010; Revision received 28 October 2010; Accepted 12 November 2010. First published online March 8, 2011. This work was supported by the U.S. National Science Foundation (NSF) Continental Dynamics program (grant EAR-0507431), a NSF graduate research fellowship to Lease, and the Chinese National Science Foundation (40234040, 40702028). We thank L. Hedges, P. O’Sullivan, and P. Zhang for assistance, plus E. Cowgill and an anonymous reviewer.|
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|Deposited By:||Jason Perez|
|Deposited On:||14 Apr 2011 18:07|
|Last Modified:||14 Apr 2011 18:07|
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