Episodes 2020; 43(1): 381-403
Published online March 1, 2020
Copyright © International Union of Geological Sciences.
*R.C. Patel and Manmohan
National Facility Lab on Low-Temperature Thermochronology (Fission Track Dating), Department of Geophysics, Kurukshetra University, Kurukshetra-136 119
Correspondence to:R.C. Patel; Email: email@example.com)
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The collisional Himalayan orogen is commonly presented as largely laterally uniform from the NW– to NE–Himalaya, with almost similar geological and tectonic settings. Despite active continuous convergence and precipitation since many million years in the Himalaya, thermochronological/cooling age pattern, uplift and exhumation rates vary in different parts of NW– and NE–Himalaya as a function of structural positions such as dome/window/synform, klippen/nappe structures and thrusting/back-thrusting along different major faults. These surface structures appear to reflect the geometry and kinematics of the Main Himalayan Thrust (MHT) and duplex structures formed over the ramp of the MHT. These observations suggest that in this tectonically-active setting characterized by steep topography and intense storms, thermochronological/cooling age pattern and exhumation patterns do not mirror precipitation gradients or drive deformation on million-year timescales. Rather, exhumation patterns are controlled by local tectonics that is dictated by the subsurface geometry of the MHT and its associated structures.