Himalayan Neotectonics and Channel Evolution

0583529 - ÚSMH 2024 RIV CH eng M - Monography Chapter
Goswami Chakrabarti, Chandreyee - Narzary, B. - Weber, J.C. - Jana, P. - Bhattacharjee, S. - Jaiswal, M.
Preliminary Study of the Manabhum Anticline: A Possible Key to Better Understanding the Quaternary Tectonics of the Eastern Himalayan Syntaxial Zone.
Himalayan Neotectonics and Channel Evolution. Cham: Springer, 2022, s. 239-260. Society of Earth Scientists Series, 1. ISBN 978-3-030-95434-5
Institutional support: RVO:67985891
Keywords : Eastern Himalayan Syntaxis * Quaternary Tectonics * Stratigraphy
OECD category: Volcanology
https://doi.org/10.1007/978-3-030-95435-2_9

The NNW-SSE trending Manabhum Anticline is an impressive hill in the foredeep area of the Naga-Schuppen belt near Mishmi Hill on the southern bank of the Brahmaputra. We present a detailed geological study of this area to better establish its Quaternary tectonics. Rocks exposed in the core of the Manabhum anticline are Pleistocene in ages and Holocene sediments are also involved in the deformation. We have prepared a geological map at the 1:25,000 scale and for the first time dated nine representative samples of rocks and sediments from this area. Three distinct age ranges have been obtained, ~220 ka- ~130 ka, ~ 67 ka- ~36 ka, and less than 10 ka. We interpret the Manabhum Hill as an asymmetric antiformal fold that is actively developing in a compressive regime near the Eastern Himalayan Syntaxis (EHS) zone. We present evidence that it has been highly active tectonically during Pleistocene-Holocene time and maybe a key to understand how collision has accommodated and evolved in the eastern syntaxis.
Permanent Link: https://hdl.handle.net/11104/0352282