Geochemical fractionation of Ni,Cu and Pb in the deep sea sediments from the Central Indian Ocean Basin: An insight into the mechanism of metal enrichment in sediment |
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| Institution: | 1. School of Engineering and Science, Earth and Space Sciences Program, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany;2. MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, 28359 Bremen, Germany;3. Marine and Freshwater Chemistry, University of Otago Research Centre for Oceanography, Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand;4. NIWA/University of Otago Research Centre for Oceanography, Department of Chemistry, University of Otago, Dunedin, New Zealand;5. Hydrothermal Geomicrobiology Group, MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, 28359 Bremen, Germany;1. Università degli Studi della Basilicata, Dipartimento di Scienze, via Ateneo Lucano 10, 85100 Potenza, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy;3. Università della Calabria, Dipartimento di Biologia, Ecologia e Scienze della Terra, via Pietro Bucci, 87036 Arcavacata di Rende, Italy |
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| Abstract: | Metal speciation study in combination with major element chemistry of deep sea sediments provided possible metal enrichment pathways in sediments collected from environmentally different locations of Central Indian Ocean Basin (CIB). Metal speciation study suggests that Fe–Mn oxyhydroxide phase was the major binding phase for Ni, Cu and Pb in the sediments. The second highest concentrations of all these metals were present within the structure of the sediments. Easily reducible oxide phase (within the Fe–Mn oxyhydroxide binding phases) was the major host for all the three metals in the studied sediments. Major element chemistry of these sediments revealed that there was an increased tendency of Cu and Ni to get incorporated into the deep sea sediment via the non-terrigenous Mn-oxyhydroxide fraction, whereas, Pb gets incorporated mostly via amorphous Fe-hydroxides into the sediment from the CIB. This is the first attempt to provide an insight into the mechanism of metal enrichment in sediment that host vast manganese nodule. |
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| Keywords: | Central Indian Basin Deep sea sediments Sequential extraction Heavy metals Speciation |
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