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Title: 100 kyr sedimentary record of Marginal Gangetic Plain: Implications for forebulge tectonics
Authors: Ghosh R.
Srivastava, P.
Shukla U.K.
Sehgal R.K.
Singh I.B.
Published in: Palaeogeography, Palaeoclimatology, Palaeoecology
Abstract: The Gangetic Foreland is a consequence of continent-continent collision and formation of the Himalayan thrust and fold belt. In the more distal part of the peripheral Gangetic foreland basin, the Late Quaternary sedimentary architecture analysis from 17 stratigraphic successions together with optically stimulated luminescence dating (OSL) divulge interaction of peripheral bulge tectonics and climate over the past ~100 kyr. These sections exhibit three sedimentary packages formed under different environmental conditions. Detailed vertical and lateral sedimentary architecture delineates nine lithofacies that are grouped into three facies associations, (i) flood plain facies association, (ii) channel facies association, and (iii) interfluve facies association. The basal package-I, >114 ka old, was deposited by sandy meandering channels and overlying to this with a hiatus of ~30 ka is package-II, ~80–54 ka, deposited by gravelly rivers. The sediments of both the packages-I, II are derived from rocks exposed in the peripheral bulge region. Overlain package- III, deposited by small meandering channels, consist of the sediments derived from the Himalaya. The results indicate that the duration of 80–54 ka was a period of forebulge uplift when gravelly fans prograded basinward. Below the fan sediments lies a peripheral bulge unconformity marked by regionally significant pedogenic horizon. This pedogenic horizon qualifies as to be termed as peripheral bulge uncomformity. After 54 ka, the fine Himalayan sediments onlap the cratonic sediments implying rather a stable forebulge tectonics coupled with fluctuating climatic conditions, occasionally bringing micaceous gray coloured sand-silt of Himalayan origin. © 2019 Elsevier B.V.
Citation: Palaeogeography, Palaeoclimatology, Palaeoecology, 520: 78-95
Issue Date: 2019
Publisher: Elsevier B.V.
Keywords: Fluvial architecture
Foreland dynamics
Luminescence dating
ISSN: 310182
Author Scopus IDs: 57192102625
Author Affiliations: Ghosh, R., Wadia Institute of Himalayan Geology, Dehradun, 248001, India, Department of Geology, Banaras Hindu University, Varanasi, 221005, India
Srivastava, P., Wadia Institute of Himalayan Geology, Dehradun, 248001, India
Shukla, U.K., Department of Geology, Banaras Hindu University, Varanasi, 221005, India
Sehgal, R.K., Wadia Institute of Himalayan Geology, Dehradun, 248001, India
Singh, I.B., Centre of Advanced Study in Geology, University of Lucknow, Lucknow, 226007, India
Funding Details: This manuscript is part of Rupa Ghosh's Ph.D. thesis. RG, PS and RKS acknowledge the Director, WIHG for support. RG thanks Mr. Raju, Mr. Sourabh Singh for their help during field work. UKS acknowledges support from the Head, Department of Geology, BHU, Varanasi. We acknowledge the efforts of the two anonymous reviewers that helped improving the manuscript significantly.
Corresponding Author: Srivastava, P.; Wadia Institute of Himalayan GeologyIndia; email:
Appears in Collections:Journal Publications [ES]

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