Sr and Nd isotopes as tracers in pedogenic studies: Evidence for Saharan dust contribution to the soils of Muravera (Sardinia,Italy) |
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| Institution: | 1. Dipartimento di Scienze della Terra, University of Rome “La Sapienza”, Piazzale A. Moro 5, I-00185 Rome, Italy;2. IGAG – Istituto di Geologia Ambientale e Geoingegneria – CNR c/o Dipartimento di Scienze della Terra, University of Rome “La Sapienza”, Piazzale A. Moro 5, I-00185 Rome, Italy;1. Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, 09596 Freiberg, Germany;2. Helmholtz-Institut Freiberg für Ressourcentechnologie, Halsbrücker Straße 34, 09599 Freiberg, Germany;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, 100037 Beijing, China;2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, 100037 Beijing, China;1. Department of Environment, Earth and Ecosystems, CEPSAR, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK;2. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK;3. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ. Paris Diderot, CNRS, F-75005 Paris, France;4. Institut Universitaire de France, France;5. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK;6. Department of Earth Sciences, Durham University, Science Labs, Durham DH1 3LE, UK;1. Institute of Earth Sciences, The Hebrew University, Givat Ram, Jerusalem, Israel;2. The Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem, Israel;3. Lamont–Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, United States;1. Lithosphere Fluid Research Lab, Department of Petrology and Geochemistry, Institute of Geography and Earth Sciences, Eötvös University, Pázmány Péter stny 1/c, Budapest H-1117, Hungary;2. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Budapest H-1112, Hungary;3. Research Institute for Soil Science and Agrochemistry, Centre for Agricultural Research, Hungarian Academy of Sciences, Herman Ottó út 15, Budapest H-1022, Hungary;4. Department of Animal Hygiene, Herd Health and Animal Ethology, Faculty of Veterinary Science, Szent István University, István utca 2, Budapest H-1078, Hungary;5. Technische Universität Bergakademie Freiberg, Interdisciplinary Environmental Research Centre (IÖZ), Brennhausgasse 14, Freiberg D-09599, Germany |
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| Abstract: | Sr and Nd isotopes were applied to 5 soil profiles from the Muravera area, in south-eastern Sardinia.All the soils, which have developed during the Quaternary on the Lower Paleozoic metamorphic basement except for one on Eocene carbonates, are located far from major sources of pollution. Therefore, they are suitable for testing pedogenic processes and geochemical evolution to benefit for environmental studies.The Sr isotopic ratios range largely (δ87Sr = 1.7–65.9‰), even in each soil profile. In particular, the observed increase of δ87Sr with depth in the most of the metamorphic rock-based soils can be accounted for by the downward decrease of Sr contributions from organic matter and Saharan dust, both displaying lower isotopic ratios than the soil bedrocks. The carbonate rock-based soil exhibits δ87Sr higher (1.7–18.1‰) than the bedrock, indicating a significant contribution of radiogenic Sr from the siliciclastic fraction of the soil, and probably from dust input. The Nd isotopic ratios are slightly variable through the profiles (?Nd from ?7.8 to ?14.5), confirming little mobility of Nd and Sm during the pedogenesis. Among the minerals present in the soils, phosphates, albite, and calcite are those important in providing low radiogenic Sr and Nd to organic matter of the soils.Lastly, this isotopic study has in particular allowed for evaluating the potential proportion of contribution of Saharan dust to south-eastern Sardinia, thus corroborating the findings of other studies related to soils from the central-western Mediterranean. |
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| Keywords: | Sr–Nd isotopes Unpolluted soils Metamorphic rocks Pedogenesis Sr–Nd sources Saharan dust Muravera Sardinia |
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