Law, R.D. ; Stahr, D.W. ; Francsis, M.K. ; Ashley, K.T. ; Grasemann, B. ; Ahmad, T. (2013) Deformation temperatures and flow vorticities near the base of the Greater Himalayan Series, Sutlej Valley and Shimla Klippe, NW India Journal of Structural Geology, 54 . pp. 21-53. ISSN 01918141
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Official URL: http://doi.org/10.1016/j.jsg.2013.05.009
Related URL: http://dx.doi.org/10.1016/j.jsg.2013.05.009
Abstract
We report new deformation temperature and flow vorticity data from the base of the Greater Himalayan Series (GHS) exposed in the Sutlej Valley and Shimla Klippe of NW India. We focus on three groups of transects across the hanging wall of the Main Central Thrust (MCT). In order of relative foreland – hinterland positions, they are the Shimla Klippe, Western and Eastern Sutlej transects. Deformation temperatures indicated by quartz c-axis fabric opening-angles increase both from foreland to hinterland at a given structural distance above the MCT and up structural section from the MCT within individual transects. Deformation temperatures in the immediate hanging wall to the MCT are estimated at ∼510–535, 535–550 and 610 °C on the Shimla, Western Sutlej and Eastern Sutlej transects, respectively. The steepest inferred field gradients in deformation temperatures are recorded adjacent to the MCT and progressively decrease up structural section following a power law relationship. Comparison with temperature estimates based on multi-mineral phase equilibria data suggests that penetrative shearing occurred at close to peak metamorphic conditions. Vorticity analyses indicate that shearing along the base of the GHS occurred under sub-simple shear conditions (Wm values of 0.9–1.0) with a minor component of pure shear.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Ltd. |
Keywords: | Main central thrust, Himalaya, Quartz fabrics, Deformation temperatures, Vorticity, Strain rate |
ID Code: | 129846 |
Deposited On: | 25 Nov 2022 10:43 |
Last Modified: | 25 Nov 2022 10:43 |
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