Browsing by Author "Rabindra Kumar Patel"

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Interplay of tectonics and erosion controls the exhumation of the Tso-Morari Crystallines in the India–Asia collision zone
(Taylor and Francis Ltd., 2025) Vikas Adlakha; Shailendra Pundir; Rabindra Kumar Patel; Ramesh Chandra Patel
Understanding the exhumation history of the gneissic domes in continental collision zones is vital for deciphering the orogen’s geodynamic evolution. This study uses the zircon and apatite fission track (ZFT and AFT) dataset and thermokinematic modeling constraints to understand the tectonic evolution of the Tso-Morari crystalline (TMC) dome exposed in Ladakh, NW India. The ZFT and AFT ages vary from ~36.9 to ~27.7 Ma and ~16.3 to ~7.5 Ma. The ZFT cooling ages show no systematic variation, while AFT ages become younger, from ~25.7 Ma to 7.5 Ma across the dome. ZFT ages suggest that doming has been inactive since ~35 Ma. Based on thermochronological results, the thermokinematic modeling suggests that the Ribil Zildat fault (RZF) and Karzog fault bounding the TMC dome, were activated in three phases. They first activated as normal faults between ~49.8–41.3 Ma and ~49.7–43.8 Ma, respectively. The second activation phase occurred between ~24.3–20.1 Ma for RZF as a normal fault and ~20.3–13.7 Ma for the Karzog fault as a thrust. The third activation phase was 12–10.9 Ma for RZF as a normal fault and ~12.1–9.8 Ma for the Karzog fault as a thrust. We propose that these faults’ second and third activation phases were due to the activation of the normal faults in the north Himalayan nappes. © 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Thermochronological constraints on the exhumation of the tectonic wedges in the Higher Himalayan Crystalline and Lesser Himalayan Sequence along Yamuna Valley, NW- Himalaya
(Elsevier Ltd, 2025) Sanjeeb Behera; Rabindra Kumar Patel; Vikas Adlakha; Cody L. Colleps; Ramesh Chandra Patel
The NW Himalayas exhibit significant spatial variability in exhumation patterns, shaped by complex tectonic and climatic interactions. This study reconstructs the Mio-Pleistocene exhumation history of the Yamuna Valley, Uttarakhand, focusing on the Purola Klippe and Kharsali Window, using twenty fission track ages. Along a ∼40 km transect, apatite fission track (AFT) ages in the Kharsali Window range from 3.6 ± 0.5 to 5.3 ± 1.0 Ma, while in the Purola Klippe, they span 3.9 ± 0.6 to 6.2 ± 1.1 Ma. The zircon fission-track (ZFT) ages show a range, varying from 4.4 ± 0.3 to 6.0 ± 0.3 Ma in the Kharsali Window and from 9.2 ± 0.5 to 13.2 ± 0.4 Ma in the Purola Klippe. Exhumation rates derived by employing age2Exhume modeling suggest significantly higher exhumation in the Kharsali Window at the Pliocene (5 to 4 Ma), while the Purola Klippe has experienced relatively steady exhumation since the Late Miocene (∼11 Ma). At 4 Ma, reactivation of the Main Boundary Thrust (MBT) resulted in uniform vertical uplift and uniform exhumation along the Yamuna Valley, reflecting consistent uplift dynamics governed by duplexing and climatic feedback mechanisms. Our study provides a refined understanding of the tectonothermal evolution of klippen and windows in the NW Himalaya, shedding new light on its orogenic evolution and dynamic landscape development. © 2025 Elsevier Ltd