Luminescence chronology of river adjustment and incision of Quaternary sediments in the alluvial plain of the Sabarmati River, north Gujarat, India |
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| Authors: | Pradeep Srivastava Navin Juyal Ashok K Singhvi Robert J Wasson Mark D Bateman |
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| Institution: | 1. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China;2. Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China;3. College of Geography and Environment, Henan University, Jinming Street, Kaifeng, Henan 475004, China;4. Henan Key Laboratory of Earth System Observation and Modeling, Henan University, Kaifeng 475004, China |
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| Abstract: | River adjustment and incision in the Sabarmati basin, Gujarat, India have been examined at a site near Mahudi. Towards this, the morphostratigraphy and depositional chronometry of the middle alluvial plains were investigated. The upper fluvial sequence, along with the overlying aeolian sand and riverbed scroll plains, provide clues to the evolution of the present Sabarmati River. Sedimentological analyses of the upper fluvial sequence indicate its deposition by a meandering river system during what is believed to be a persistent wetter phase. Luminescence chronology bracketed this sequence to between 54 and 30 ka, which corresponds to Oxygen Isotope Stage-3, during which the SW monsoon was enhanced. The overlying aeolian sand has been dated to 12 ka, indicating that dune accretion occurred simultaneously with the strengthening of the SW monsoon during the Early Holocene. Adjustment of the Sabarmati along a N–S transect is placed around 12 ka and the incision is bracketed between 12 and 4.5 ka. River adjustment could have been tectonic; however, the incision was facilitated by the availability of continuous flow in the river caused by the SW monsoon. The basin experienced two tectonic events at about 3 and 0.3 ka, as demonstrated by the morphology of the scroll plains. |
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| Keywords: | Gujarat alluvial plains Sabarmati River channel incision scroll plains Quaternary climate neotectonism luminescence chronology |
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