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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/22020
Title: Apatite and zircon fission-track thermochronology constraining the interplay between tectonics, topography and exhumation, Arunachal Himalaya
Authors: Pebam J.
Adlakha V.
Jain A.K.
Patel R.C.
Lal N.
Singh, Sandeep
Kumar R.
Devrani R.
Published in: Journal of Earth System Science
Abstract: Thirty-eight new apatite and zircon fission-track ages from 26 bedrock samples vary from 2.0 ± 0.3 to 12.1 ± 1.2 Ma, and 3.3 ± 0.3 and 13.2 ± 0.7 Ma, respectively, along three transects of the Kurung, Subansiri, and Siyom Rivers, which flow across the major structures of the Arunachal Himalaya. These cooling ages reveal marked variations in millennial-scale (>105 yr) exhumation rates from 0.6 to 3.0 mm/yr. A distinct positive correlation is visible between local topographic relief, hill slopes, channel steepness, and exhumation rates. The cooling ages are younger in the northern antiformal domains and older within the synformal nappe along the mountain front. Thermal modelling and time–temperature paths suggest that zones of rapid exhumation are controlled by structural windows within the Lesser Himalaya that were developed between 8 and 6 Ma over blind Main Himalayan Thrust (MHT). This time of rapid rock uplift and major topographic change led to a two-fold increase in the exhumation rates in the northern antiformal domains than the southern front of Arunachal Himalaya. Variation in cooling ages does not correlate with the present-day precipitation pattern. Tectonics appears to be the leading factor in driving the exhumation rates and landscape evolution in the Arunachal Himalaya. © 2021, Indian Academy of Sciences.
Citation: Journal of Earth System Science, 130(3)
URI: https://doi.org/10.1007/s12040-021-01667-2
http://repository.iitr.ac.in/handle/123456789/22020
Issue Date: 2021
Publisher: Springer
Keywords: Arunachal Himalaya
climate
exhumation
tectonics
thermochronology
topography
ISSN: 23474327
Author Scopus IDs: 57233359300
37065792200
57211729470
8084812600
7005034455
7406400956
57209875474
42561096800
Author Affiliations: Pebam, J., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247 667, India
Adlakha, V., Wadia Institute of Himalayan Geology, Dehradun, 248 001, India
Jain, A.K., CSIR-Central Building Research Institute, Roorkee, 247 667, India
Patel, R.C., Department of Geophysics, Kurukshetra University, Kurukshetra, 136 119, India, Centre of Advanced Studies, Department of Geology, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India
Lal, N., Department of Geophysics, Kurukshetra University, Kurukshetra, 136 119, India
Singh, S., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247 667, India
Kumar, R., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247 667, India
Devrani, R., Wadia Institute of Himalayan Geology, Dehradun, 248 001, India
Funding Details: This work was supported by research grants from the Department of Science and Technology, Government of India (DST-230-ESD and DST-380-ESD), and finalized during the research grants by the MoES [MoES/P.O.(Geo)101(g)/2016, dated 30.1.2020], Honorary Scientist Scheme of the Indian National Science Academy (INSA) to AKJ and CAP-Himalaya (Activity 7) of Wadia Institute of Himalayan Geology (WIHG) to VA. The authors thank Bodo Bookhagen for sharing the precipitation data. Pardeep Guri is thanked for the GIS guidance. The authors thank Kate Huntington, Dave Whipp for comments on the previous version of this manuscript, and two anonymous reviewers for comments on this manuscript, which improved the paper. Support received from the National Facility Lab on Low-Temperature Thermochronology, Kurukshetra University, Kurukshetra, during the preparation of the manuscript, is highly acknowledged. VA thanks the Director, WIHG, Dehradun, for constant encouragement, while SS, JP and RK appreciate the facilities at the Department of Earth Sciences, IIT Roorkee, Roorkee. Indian National Science Academy, INSA; Department of Science and Technology, Ministry of Science and Technology, India, डीएसटी: DST-230-ESD, DST-380-ESD; Ministry of Earth Sciences, एमओईएस; Kurukshetra University
Corresponding Author: Adlakha, V.; Wadia Institute of Himalayan GeologyIndia; email: vikas.himg@gmail.com
Appears in Collections:Journal Publications [ES]

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