Water-rock-tailings interactions and sources of sulfur and metals in the subtropical mining region of Taxco,Guerrero (southern Mexico): A multi-isotopic approach |
| |
| Institution: | 1. Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Mexico City, Mexico;2. Instituto de Geología, Universidad Nacional Autónoma de México, Mexico City, Mexico;3. Laboratorio Nacional de Geoquímica y Mineralogía, Ciudad Universitaria, Mexico City, Mexico;4. Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico;5. Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico City, Mexico;6. Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana-Xochimilco, Mexico City, Mexico;1. A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia;2. Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia;3. Kazan Federal University, Kazan, Russia;4. M.V. Lomonosov Moscow State University, Moscow, Russia;1. Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, CZ-128 43 Prague 2, Czech Republic;2. Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague 6, Czech Republic;3. Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic;4. Department of Geology, Faculty of Science, Palacky University in Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;5. Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague 6, Czech Republic;6. Department of Geology, Faculty of Science, University of Namibia, Private Bag, 13301, Windhoek, Namibia |
| |
| Abstract: | Multi-isotope (H, O, S, Sr, Pb) systems coupled with conventional (major and trace element) hydrogeochemical analysis were applied to determine the origin of water, to model water-rock-tailings interactions and for source apportionment of sulfur and associated toxic metals in the mining region of Taxco, Guerrero in southern Mexico. Oxygen and H isotopes indicate that meteoric water in the zone is rainwater undergoing varying degrees of isotopic fractionation by atmospheric evaporation whereas Sr isotopes trace the interaction of pristine water from volcanics of the regional recharge zone and subsequently flowing through sandstone and shale to spring points. Leachates form from two distinctive sources (spring water and surface water) having differential interactions with bedrocks prior to entering the tailings. Compared to pristine water, leachates are enriched in sulfate, metals (e.g. Fe, Mn, Pb and Zn) and metalloids (e.g. As). The sulfur isotopic composition of ore-sulfides, leachates, secondary precipitates, regional surface water and hypogenic sulfates is described in terms of a two-component mixing model with shale of Mexcala and limestone of Morelos formations representing the light and heavy end-members, respectively, whereas Sr isotopic composition is bracketed combining three lithogenic (Mexcala/Morelos, Tilzapotla and Taxco Schist) sources. Finally, leachates have a mixture of lead from ore-sulfides and Taxco Schist Formation (Family I) or from ore-sulfides alone (Family II). The application of multiple environmental isotopic techniques is an outstanding tool for elucidating complex interactions of water with bedrocks and tailings and for determining the source of sulfur and toxic metal from mining and other metal polluted environments. |
| |
| Keywords: | Sulfide tailings Hydrogeochemistry H O S Sr and Pb isotopes Isotopic fractionation Water and leachate origin |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
