Modelling Quaternary thrusting in Himalayas and its geodynamic constraints in Southern Tibet

Shanker, D. and Kapur, N. and Singh, V. P. (2004) Modelling Quaternary thrusting in Himalayas and its geodynamic constraints in Southern Tibet. Acta Geodaetica et Geophysica Hungarica, 39 (1). pp. 73-87. ISSN 1217-8977

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Abstract

The occurrence of Quaternary thrusting in Himalayas and its geodynamics constraints in Southern Tibet is modelled using stress simulation analysis. 2D non-linear elastic and homogeneous wedge models, representing cross-sections of the Himalayas and Tibet are used. Simulated stresses for a set of boundary conditions, representing building up of Himalayas and Southern Tibet, reveals the region of thrust failure gradually recedes away from the wedge towards the base (lower boundary) with a decrease in the strength of the base. Thus, the result favours the preposition that a strong and a weak basal (Main Himalayan Thrust; MHT) respectively, below Himalayas and Southern Tibet is responsible for presence and restricting the extension of Quaternary thrusting in these regions. A decrease in strength of MHT from the Himalayas to Tibet is also supported by observational evidence and thermal modelling, imply partial melting along MHT.

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