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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Controls on intense silicate weathering in a tropical river, southwestern India
Chemical Geology, Volume 300-301, Year 2012
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Description
The Silicate Weathering Rate (SWR) and associated Carbon dioxide Consumption Rate (CCR) in tropical silicate terrain is assessed through a study of the major ion chemistry in a small west flowing river of Peninsular India, the Nethravati River. The specific features of the river basin are high mean annual rainfall and temperature, high runoff and a Precambrian basement composed of granitic-gneiss, charnockite and minor meta-sediments. The water samples (n=56) were collected from three locations along the Nethravati River and from two of its tributaries over a period of twelve months. Chemical Weathering Rate (CWR) for the entire watershed is calculated by applying rainwater correction using river chloride as a tracer. Chemical Weathering Rate in the Nethravati watershed is estimated to 44t.km -2.y -1 encompassing a SWR of 42t.km -2.y -1 and a maximum carbonate contribution of 2t.km -2.y -1. This SWR is among the highest reported for granito-gneissic terrains. The assessed CCR is 2.9·10 5mol.km -2.y -1. The weathering index (Re), calculated from molecular ratios of dissolved cations and silica in the river, suggests an intense silicate weathering leading to kaolinite-gibbsite precipitation in the weathering covers. The intense SWR and CCR could be due to the combination of high runoff and temperature along with the thickness and nature of the weathering cover. The comparison of silicate weathering fluxes with other watersheds reveals that under similar morpho-climatic settings basalt weathering would be 2.5 times higher than the granite-gneissic rocks. © 2012 Elsevier B.V.
Authors & Co-Authors
Riotte, Jean
India, Bengaluru
Indo French Cell for Water Sciences
France, Toulouse
Géosciences Environnement Toulouse
Braun, Jean Jacques
India, Bengaluru
Indo French Cell for Water Sciences
France, Toulouse
Géosciences Environnement Toulouse
Audry, Stéphane
France, Toulouse
Géosciences Environnement Toulouse
Manjunatha, Busnur Rachotappa
India, Mangalore
Mangalore University
Statistics
Citations: 69
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1016/j.chemgeo.2012.01.016
ISSN:
00092541
Research Areas
Environmental