Mineralogical signatures and sources of recent sediment in a large tropical lake |
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| Authors: | Jorge Feliciano Ontiveros-Cuadras Ana Carolina Ruiz-Fernández Joan-Albert Sanchez-Cabeza Libia Hascibe Pérez-Bernal Michel Preda Federico Páez-Osuna |
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| Institution: | 1. Polytechnic University of Sinaloa (UPSIN), Carretera Municipal Libre Mazatlan Higueras Km 3, 82199 Mazatlán, Sinaloa, Mexico;2. Mazatlan Academic Unit, Institute of Marine Sciences and Limnology, National Autonomous University of Mexico (UNAM), Calz. Joel Montes Camarena s/n, 82040 Mazatlán, Sinaloa, Mexico;3. Oceanic and Coastal Processes Academic Unit, Institute of Marine Sciences and Limnology, National Autonomous University of Mexico (UNAM), University City, Coyoacan, 04510 Mexico City, Mexico;4. Department of Earth and Atmospheric Sciences, University of Quebec in Montreal (UQAM), 201 Ave. President-Kennedy, PK-5925, Montreal, Canada H2X 3Y7 |
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| Abstract: | Two lead-210 (210Pb) dated sediment cores from Chapala Lake were studied to identify the mineral composition of the sediments and to discuss its relation with trace metals. Minerals and trace metals reflected the domain of volcanic rocks (i.e. basalts, rhyolite and andesite) that characterize Chapala Lake and the Lerma River watershed. Redundancy analyses (RDA) were used to identify the sedimentary variables (magnetic susceptibility, organic matter, sand content, and mineral composition) that could be related to elemental composition. Despite the distance between the two cores (7.3 km) and hydrodynamic circulation the RDA showed that the main mechanism that controls the input of mineral species, and, therefore, element distributions in the lacustrine sediment of Chapala Lake, is related to the weathering of volcanic rocks in the Lerma-Chapala watershed, the consequent runoff and transport of fine grained catchment materials, and later in-lake processes. These findings highlight the importance of controlling watershed erosion to contribute to the improvement of the environmental quality of the lake. |
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| Keywords: | Chapala Lake Trace metals Mineralogy Lacustrine sediments |
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