Evidence of elastic strength variation across the Central Indian Tectonic Zone: A support to the Proterozoic collisional tectonics

摘要

Isostatic models of the lithosphere generally consider the topographic loads supported in part by stresses within the lithosphere, and in part by forces associated with the deflection of density interfaces. Information on the mechanical properties of the lithosphere is generally derived from the gravity and topography transfer function relationships. In this study, we map for a possible strength variation across the Central Indian Tectonic Zone (CITZ), using coherence method extended to two-dimensional fields. Present estimations yielded relatively higher effective elastic thickness values for the North Indian Block, representing a stronger lithosphere, than the South Indian Block. This strength variation provides significant support to the Proterozoic collisional tectonics across the CITZ.