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The Geochemistry of 1 ky Old Euxinic Sediments of the Western Black Sea

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Department of the Structer of Matter, Earth and Atmospheric Physics and Astrophysics, University of Bucharest, P.O. Box MG-11, 077125 Magurele (Ilfov), Romania
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Joint Institute for Nuclear Research, Joliot Curie str. 6, 141980 Dubna, Russia
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National Institute of Research and Development for Physics and Nuclear Engineering “Horia - Hulubei”, P.O. Box MG-6, 077125 Magurele (Ilfov), Romania
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Geographie und Geologie, Salzburg University, Kapitelgasse 4–6, 5020 Salzburg, Austria
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Studienzentrum Naturkunde, Universalmuseum Joanneum, Weinzöttlstraße 16, 8045 Graz, Austria
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National Institute of Marine Geology and Geoecology, Dimitrie Onciul str. 23–25, 024053 Bucharest, Romania
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National Institute for Research and Development in Electrical Engineering, 313 Splaiul Unirii, 060032 Bucharest, Romania
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Department of Mineralogy, University of Bucharest, Nicolae Balcescu Blv. 1, 010041 Bucharest, Romania
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Geosciences 2019, 9(11), 455; https://doi.org/10.3390/geosciences9110455
Received: 18 July 2019 / Revised: 9 October 2019 / Accepted: 18 October 2019 / Published: 23 October 2019
To get more data on the geochemistry of Black Sea euxinic sediments, a 50-cm core was collected at a depth of 600 m on a Western Black Sea Continental Platform slope. The core contained unconsolidated sediments rich in cocoolithic ooze and mud. Epithermal Neutron and Prompt Gamma Activation Analysis were used to determine the content of nine major (Na, Mg, Al, Si, K, Ca, Ti, Mn, and Fe as oxides) and 32 trace elements (Cl, Sc, V, Cr, Co, Ni, Zn, As, Se, Br, Rb, Sr, Zr, Mo, Sn, Sb, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Yb, Hf, Ta, W, Th, and U) with a precision varying between 3 and 9%. The core contained unconsolidated sediment rich in coccolithic ooze and mud. Previous 210 Pb geochronology suggests an age of ∼1 ky of considered sediments. Major components distribution showed that, except for Cl and Ca, the contents of all other elements are similar to Upper Continental Crust (UCC) and North American Shale Composite (NASC). The distribution of the 32 trace elements showed similarities to the UCC, except for redox-sensitive metals Fe, Se, Mo, and U, of which the significantly higher content reflects the presence of euxinic conditions during deposition. A chondrite normalized plot of nine rare earth elements indicated a similarity to UCC and NASC, suggesting a continental origin of sedimentary material. View Full-Text
Keywords: Black Sea; geochemistry; unconsolidated sediments; euxinic zone; redox-sensitive elements Black Sea; geochemistry; unconsolidated sediments; euxinic zone; redox-sensitive elements
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Duliu, O.G.; Cristache, C.I.; Bojar, A.-V.; Oaie, G.; Culicov, O.-A.; Frontasyeva, M.V.; Constantinescu, E. The Geochemistry of 1 ky Old Euxinic Sediments of the Western Black Sea. Geosciences 2019, 9, 455.

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