Element enrichment and provenance of the detrital component in Holocene sediments from the western Black Sea

• Autorzy: Dekov Vesselin M. , Darakchieva Valentina Y. , Billström Kjell , Garbe-Schönberg C. Dieter , Kamenov George D. , Gallinari Morgane , Dimitrov Lyubomir , Ragueneau Olivier , Kooijman Ellen

Identyfikatory

DOI

10.1016/j.oceano.2019.10.001

• Języki publikacji: EN

Abstrakty

EN

Concentrations of a large set of major and trace elements, and Sr, Nd and Pb isotope ratios were measured in Holocene sediments cored in the western deep Black Sea in order to unravel: (1) the controls of element enrichment, and (2) sources of the detrital component. The transition of the basin from oxic to euxinic resulted in enrichment or depletion in a number of elements in the deep-sea sediments. Authigenic Fe enrichment appears to depend on the amount of Fe mobilized from the sediment through the benthic redox shuttle mechanism and free H₂S in the water column (degree of “euxinization”). Manganese enrichment is controlled by diagenetic reactions within the sediment: the dissolution of Mn minerals, Mn²⁺ diffusion upward and reprecipitation. Barium enrichment is also controlled by diagenetic reactions, sulfate reduction and methanogenesis, that take place above and below the sulfate-methane transition, respectively. The major part of V, Co, Ni, Cu, Zn, Cr, Mo, Cd and Sb is inferred to have co-precipitated with Fe in the euxinic deep waters and to have been incorporated into authigenic Fe-sulfides. Basin reservoir effect additionally influences the Mo enrichment. The U enrichment is interpreted to have a different origin in the two organic-rich stratigraphic units (II and I). It is inferred to be: (i) at the expense of the U inventory of the deepwater pool and a result of inorganic reduction of U at euxinic conditions in the lower Unit II; and (ii) at the expense of the U inventory of the surface water pool and a result of biogenic uptake and transfer to the sediment by the plankton in the upper Unit I. The high field strength elements are closely linked to the detrital component and their depletion in the organic-rich sediments reflects a dilution of the detrital component by the biogenic one. The enrichments of REE, Sn and Th are likely controlled by adsorption on clay minerals. Sr-Nd-Pb isotope compositions of the alumino-silicate component of the studied sediments are relatively uniform. They are most likely controlled by riverine suspended matter supplied mainly in the NW Black Sea (Danube Delta) and transported southward by marine currents, and to a lesser degree by suspended matter from the small rivers draining SE Bulgaria and NW Turkey. Wind-blown dust from the Sahara Desert appears to have a minor contribution to the alumino-silicate component of the sediments. The slight shift in the Pb isotopes in Unit I upper layers is possibly caused by the addition of anthropogenic Pb.

Słowa kluczowe

EN

anoxic; Black Sea; element enrichment; Sr-Nd-Pb-isotopes; Holocene

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2020
• Tom: No. 62 (2)
• Strony: 139--163
• Opis fizyczny: Bibliogr. 96 poz., mapa, rys., tab., wykr.

Twórcy

autor

Dekov Vesselin M.

• Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo, Japan
• Department of Marine Geosciences, IFREMER, Plouzané, France

autor

Darakchieva Valentina Y.

• Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria

autor

Billström Kjell

• Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden

autor

Garbe-Schönberg C. Dieter

• Institute of Geosciences, Marine Climate Research, University of Kiel, Kiel, Germany

autor

Kamenov George D.

• Department of Geological Sciences, University of Florida, Gainesville, FL, USA

autor

Gallinari Morgane

• UMR CNRS/UBO 6539 LEMAR, European Institute for Marine Studies, Technopôle Brest-Iroise, Plouzané, France

autor

Dimitrov Lyubomir

• Institute of Oceanology, Bulgarian Academy of Sciences, Varna, Bulgaria

autor

Ragueneau Olivier

• UMR CNRS/UBO 6539 LEMAR, European Institute for Marine Studies, Technopôle Brest-Iroise, Plouzané, France

autor

Kooijman Ellen

• Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).