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Physical and chemical weathering rates and CO2 consumption in a tropical lateritic environment: the upper Niger basin

Boeglin, Jean-Loup and Probst, Jean-Luc Physical and chemical weathering rates and CO2 consumption in a tropical lateritic environment: the upper Niger basin. (1998) Chemical Geology, vol. 1 (n° 3-4). pp. 137-156.

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Official URL: http://dx.doi.org/10.1016/S0009-2541(98)00025-4

Abstract

The chemical composition of Niger river water measured bimonthly at Bamako Mali. during the period 1990–1992 provides an estimate of present weathering rates in the upper Niger basin. The dominant weathering process is kaolinite formation ‘monosiallitization’.. However, seasonal variations promote gibbsite formation in the rainy season September. and smectite development in the dry season May. The results show that lateritic profiles continue to develop even during very dry episodes. The rate of profile development, calculated as the difference between the chemical weathering rate at the base of the soil profile and mechanical erosion rate at the soil surface, is about 1.3 to 3.7 mrMyr. A comparison between 43 river basins of the world shows that, for similar runoff, the CO2 flux consumed by silicate weathering is about two times lower in lateritic areas than in nonlateritic zones.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Chemical Geology: http://www.elsevier.com/wps/find/journaldescription.cws_home/503324/description#description
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
French research institutions > Institut de Recherche pour le Développement - IRD
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Deposited By: Florence Amor

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