Journal
GEOMORPHOLOGY
Volume 227, Issue -, Pages 153-165Publisher
ELSEVIER
DOI: 10.1016/j.geomorph.2013.07.027
Keywords
Kaveri River; Longitudinal profiles; Geomorphic indices of active tectonics; Bedrock gorges; Hanging valleys; OSL dates
Funding
- ISRO-UOP Technology Cell, University of Pune, India [GOI-A-337(B) (60)]
- National Science Council, Taiwan and Central Geological Survey, Taiwan [N5C94-2119-M-002-002, NSC95-2119-M-002-041]
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The Indian Peninsula is generally considered as a tectonically stable region, where ancient rocks, rivers and land surfaces predominate. In some parts of this ancient landscape, however, the role of tectonic landsculpting is strongly indicated by the presence of youthful topography and historical seismic activity. The present study is primarily focused on the middle domain of the Kaveri River, which displays such youthful features. The tectonic controls on this cratonic river were evaluated on the basis of the investigations of the longitudinal profiles, morphotectonic indices of active tectonics, and fluvial records. The presence of steep channel gradients, prominent knickpoints, hanging valleys, narrow bedrock gorges, and channel-in-channel morphology imply rapid erosion rates in the middle domain of the basin in response to active deformation, particularly in the reach defined by two major active faults - the Kollegal-Sivasamudram Fault and the Mekedatu Fault. Further, considering the remarkably low modem and long-term denudation rates and OSL ages of the alluvial deposits (30-40 ka), the tectonically-driven rejuvenation does not appear to be geologically recent as postulated by earlier workers. (C) 2013 Elsevier B.V. All rights reserved.
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