Water chemistry of Mansar Lake (India): an indication of source area weathering and seasonal variability |
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| Authors: | Ahmed?S?Al-Mikhlafi Email author" target="_blank">Brijraj?K?DasEmail author Parkash?Kaur |
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| Institution: | (1) Department of Geology and Environmental Science, Sana'a University, Sana'a, Republic of Yemen;(2) Centre of Advanced Study in Geology, Panjab University, Chandigarh-600-4, India; |
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| Abstract: | The chemistry of major elements (Ca, Mg, Na, K and Si) and anions (HCO 3, SO 4 and Cl) in the water of Mansar Lake was studied, based on seasonal data. The results show that total dissolved solid (TDS) concentration in a particular season is similar, but varies slightly in different seasons with a variation factor of less than 2. This is because the collections were made in the dry seasons and the Ca-precipitation is the cause for the seasonal variability. The major element chemistry of Mansar Lake is mainly controlled by rock weathering, with HCO 3 and Ca dominating the major ion composition because of the abundance of carbonate rocks in the basin. The results also indicate that the lake water is saturated with respect to calcite and/or dolomite during the spring season whereas it is undersaturated in the summer season. This contrast brings out seasonal variability. The lake shows disequilibrium with atmospheric CO 2 as a result of carbonate dissolution in the drainage basin. The study also shows that physical weathering/erosion is dominant and that chemical weathering is incipient. This is consistent with the Chemical Index of Alteration (CIA) data. |
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