How surface deformation within mountain ranges relates to tectonic processes at depth is not well understood. The upper crust of the Tibetan Plateau is generally thought to be poorly coupled to the underthrusting Indian crust because of an intervening low-viscosity channel1. Here, however, we show that the contrast in tectonic regime between primarily strike-slip faulting in northern Tibet and dominantly normal faulting in southern Tibet requires mechanical coupling between the upper crust of southern Tibet and the underthrusting Indian crust. Such coupling is inconsistent with the presence of active ‘channel flow’ beneath southern Tibet, and suggests that the Indian crust retains its strength as it underthrusts the plateau. These results shed new light on the debates regarding the mechanical properties of the continental lithosphere2,3,4, and the deformation of Tibet1,5,6,7,8,9,10.
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Beaumont, C., Jamieson, R. A., Nguyen, M. H. & Lee, B. Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation. Nature 414, 738–742 (2001)
Watts, A. B. & Burov, E. B. Lithospheric strength and its relationship to the elastic and seismogenic layer thickness. Earth Planet. Sci. Lett. 213 113–131 10.1016/S0012–821x(03)00289–9 (2003)
Jackson, J., Mckenzie, D., Priestley, K. & Emmerson, B. New views on the structure and rheology of the lithosphere. J. Geol. Soc. Lond. 165, 453–465 (2008)
Hetenyi, G. et al. Density distribution of the India plate beneath the Tibetan plateau: Geophysical and petrological constraints on the kinetics of lower-crustal eclogitization. Earth Planet. Sci. Lett. 264 226–244 10.1016/j.epst.2007.09.036 (2007)
Copley, A. & McKenzie, D. Models of crustal flow in the India-Asia collision zone. Geophys. J. Int. 169, 683–698 (2007)
England, P. & Houseman, G. Extension during continental convergence, with application to the Tibetan plateau. J. Geophys. Res. 94, 17561–17579 (1989)
England, P. & Molnar, P. Active deformation of Asia: from kinematics to dynamics. Science 278, 647–650 (1997)
Flesch, L. M., Haines, A. J. & Holt, W. E. Dynamics of the India-Eurasia collision zone. J. Geophys. Res. 106, 16435–16460 (2001)
Bendick, R. & Flesch, L. M. Reconciling lithospheric deformation and lower crustal flow beneath central Tibet. Geology 35, 895–898 (2007)
Clark, M. K. & Royden, L. H. Topographic ooze: building the eastern margin of Tibet by lower crustal flow. Geology 28, 703–706 (2000)
Argand, E. La tectonique de l'Asie. Proc. 13th Int. Geological Congr. 7, 170–372 (1924)
Nabelek, J. et al. Underplating in the Himalaya-Tibet collision zone revealed by the Hi-CLIMB experiment. Science 325, 1371–1374 (2009)
DeCelles, P. G., Robinson, D. M. & Zandt, G. Implications of shortening in the Himalayan fold-thrust belt for uplift of the Tibetan Plateau. Tectonics 21 10.1029/2001tc001322 (2002)
Bollinger, L., Henry, P. & Avouac, J. P. Mountain building in the Nepal Himalaya: thermal and kinematic model. Earth Planet. Sci. Lett. 244 58–71 10.1016/j.epsl.2006.01.045 (2006)
Francheteau, J. et al. High heat-flow in southern Tibet. Nature 307, 32–36 (1984)
Nelson, K. D. et al. Partially molten middle crust beneath southern Tibet: synthesis of project INDEPTH results. Science 274, 1684–1688 (1996)
Grujic, D., Hollister, L. S. & Parrish, R. R. Himalayan metamorphic sequence as an orogenic channel: insight from Bhutan. Earth Planet. Sci. Lett. 198, 177–191 (2002)
Copley, A., Avouac, J. P. & Royer, J. Y. India-Asia collision and the Cenozoic slowdown of the Indian plate: implications for the forces driving plate motions. J. Geophys. Res. 115 10.1029/2009jb006634 (2010)
Priestley, K., Jackson, J. & McKenzie, D. Lithospheric structure and deep earthquakes beneath India, the Himalaya and southern Tibet. Geophys. J. Int. 172, 345–362 (2008)
Armijo, R., Tapponnier, P., Mercier, J. L. & Han, T. L. Quaternary extension in southern Tibet—field observations and tectonic implications. J. Geophys. Res. 91, 13803–13872 (1986)
Taylor, M., Yin, A., Ryerson, F. J., Kapp, P. & Ding, L. Conjugate strike-slip faulting along the Bangong-Nujiang suture zone accommodates coeval east-west extension and north-south shortening in the interior of the Tibetan Plateau. Tectonics 22 10.1029/2002tc001361 (2003)
Tapponnier, P. & Molnar, P. Active faulting and tectonics in China. J. Geophys. Res. 82, 2905 (1977)
Bettinelli, P. et al. Plate motion of India and interseismic strain in the Nepal Himalaya from GPS and DORIS measurements. J. Geodesy 80 567–589 10.1007/s00190–006–0030–3 (2006)
Huang, W. C. et al. Seismic polarization anisotropy beneath the central Tibetan Plateau. J. Geophys. Res. 105, 27979–27989 (2000)
Copley, A. Kinematics and dynamics of the southeastern margin of the Tibetan plateau. Geophys. J. Int. 174, 1081–1100 (2008)
Cattin, R. et al. Gravity anomalies, crustal structure and thermo-mechanical support of the Himalaya of central Nepal. Geophys. J. Int. 147, 381–392 (2001)
Tseng, T. L., Chen, W. P. & Nowack, R. L. Northward thinning of Tibetan crust revealed by virtual seismic profiles. Geophys. Res. Lett. 36 10.1029/2009gl040457 (2009)
Zhang, P. Z. et al. Continuous deformation of the Tibetan Plateau from global positioning system data. Geology 32, 809–812 (2004)
Wittlinger, G. et al. Teleseismic imaging of subducting lithosphere and Moho offsets beneath western Tibet. Earth Planet. Sci. Lett. 221, 117–130 (2004)
Jackson, J., Priestley, K., Allen, M. & Berberian, M. Active tectonics of the South Caspian basin. Geophys. J. Int. 148, 214–245 (2002)
We thank the Gordon and Betty Moore Foundation for support through the Caltech Tectonics Observatory, and Pembroke College in the University of Cambridge for financial support to A.C. This work benefited from a review by L. Flesch. This is Caltech Tectonics Observatory contribution number 145.
The authors declare no competing financial interests.
This file contains Supplementary Figures 1-3 with legends and Supplementary References for the earthquake focal mechanisms show in black in Figure 1 of the main paper. (PDF 2509 kb)
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Copley, A., Avouac, J. & Wernicke, B. Evidence for mechanical coupling and strong Indian lower crust beneath southern Tibet. Nature 472, 79–81 (2011) doi:10.1038/nature09926
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