Preliminary data on chemical changes in the Aral Sea during low-level periods from the last 9000 years |
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Authors: | Laurence Le Callonnec Alain Person Maurice Renard René Létolle Nathalie Nebout Leila Ben Khelifa Ivan Rubanov |
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Affiliation: | 1. ‘Biominéralisation et Paléoenvironnements’ JE 2477, Département de géologie sédimentaire, FR32 CNRS ‘CEPAGE’, université Pierre-et-Marie-Curie, 4, place Jussieu, case 116, 75252 Paris cedex 05, France;2. Laboratoire des sciences du climat et de l''environnement, bât. 12, domaine du CNRS, av. de la Terrasse, 91190 Gif-sur-Yvette, France;3. Institute of Geology and Geophysics of the Academy of Sciences, Tashkent, Uzbekistan |
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Abstract: | The withdrawal of the Aral Sea tributaries (Amu and Syr Daria) for cultures has led to significant falls of its level and an important increase in its salinity. During the Holocene, a succession of low and high water inputs occurred. Silty deposits correspond to the high levels and carbonates to the low levels. This study makes a distinction between the Syr Daria and the Amu Daria water inputs during low-level periods by using mineralogical and chemical compositions of the carbonates deposits. Waters from the Syr Daria are more sulphatic and have a low iron content in comparison with that of the Amu Daria. The Syr Daria was the major tributary around 7500, 4956 and 970 yr?BP, whereas around 6200 and 3610 yr?BP, inflow also from the Amu Daria is observed. To cite this article: L. Le Callonnec et al., C. R. Geoscience 337 (2005). |
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Keywords: | Aral Sea Holocene Geochemistry Mineralogy River input Mer d'Aral Holocène Géochimie Minéralogie Apports fluviatiles |
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