Effects of microbial activity on the hydrochemistry and sedimentology of Lake Logipi,Kenya |
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Authors: | Sabine Castanier Marie-Claire Bernet-Rollande André Maurin Jean-Pierre Perthuisot |
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Institution: | (1) Faculté des Sciences, Université d'Angers, 2 Bd. Lavoisier, Belle Beille, F-49045 Angers cedex;(2) Service of Microbiogeology of the Laboratory of Biogeology, University of Nantes, IGPC 252;(3) TOTAL Compagnie Française des Pétroles, cedex 47, F-92069 Paris la Défense;(4) Laboratory of Biogeology, Faculté des Sciences, Université de Nantes, 2 rue de la Houssinière, F-44072, IGPC 252 Nantes cedex 03 |
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Abstract: | Lake Logipi is a saline soda and alkaline lake which marks the northern termination of the Suguta River drainage system. It also receives waters from streams, possible seepage from Lake Turkana, and hot springs. Present hydrochemistry and sedimentology is controlled by numerous factors including seasonal variations, composition of incoming waters, water depth and, above all, bacterial activity. Given the scarcity of Ca2+ and Mg2+ in the lake waters, bacterial activity seems to intensify the alkalinization of the waters which inhibits the deposition of organic matter and leads to the genesis of a poorly organic, zeolitic mud that reaches 1.5 m in tickness in the deepest part of the lake. This black layer may be overlaid with thin crusts of trona and halite which prograde over the basin from its southern bank when the lake is drying out and which are dissolved in the lake waters during the rainy season. |
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Keywords: | soda lake bacteria sediment recent Kenya |
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