Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

V. Sridhar ¹, S. S. Merh ¹

Affiliations
1 Department of Geology, M.S.University of Baroda, Baroda-390002, IN

Abstract

A thickness of over 300 m of dominantly alluvial sediments in the north Gujarat plains suggest that the sedimentation took place during the late Quaternary period in a huge graben bounded by faults that are related to the Cambay basin. An ancient super fluvial system was responsible for this vast accumulation. Most of the present day rivers are the remnants of that former system and have exposed the sediments in cliff sections. The present course of the Sabarmati appears to be unrelated to the former system for much of its length. Its course is controlled by a major lineament that developed subsequent to the deposition of the entire sequence. The earlier course of the river is now represented by the river Rupen. The uplift of the Aravallis during the Mid-Late Quaternary and the eustatic sea level changes might have disrupted the older system.

Keywords

Geomorphology, Quaternary, Sedimentation, Cambay Basin, Gujarat.

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V. Sridhar ¹, S. S. Merh ¹, L. S. Chamyal ¹

Affiliations
1 Department of Geology, M.S. University of Baroda, Baroda-390 002, IN

Abstract

The area bound by the rivers Sabarmati and Luni forming a part of North Gujarat and Southwest Rajasthan alluvial plains has preserved in its sediments and landscape various changes which have occurred in the drainage systems during the Upper Quaternary times. The present day drainage mainly cuts across the material deposited by a set of older rivers which now stand disrupted. The present day rivers are observed to have been superimposed over older river channels and dominantly follow numerous tectonic lineaments and faults of a later date. The new channels reveal and have preserved relicts of the earlier fluvial system. Geomorphic and drainage studies reveal existence of two ancient major river systems, the remnants of which are now represented by the Banas and Rupen rivers. The Banas, along with its major tributary Sipu is the sole survivor of the older fluvial system. whereas Rupen has been partially destroyed.

Keywords

Geomorphology, Drainage Systems, Quaternary, North Gujarat.

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