Abstract
Comparison of benthic foraminiferal assemblages from the core obtained within the Peterburgskoe ore field (Mid-Atlantic Ridge) and from the core taken five kilometers away from the ore field revealed evident differences in their composition, in the appearance of their shells, and also in the benthic–plankton species ratio. It was noted that the foraminiferal assemblage from the ore-bearing sediments of the Petersburg field was characterized by a higher relative content of benthic species and a large number of chemically altered and broken shells. The first occurrence of the species Osangularia umbonifera, which is able to exist in lowoxygen and CaCO3-undersaturated bottom waters at the boundary of biogenic sediments surrounding the ore field and in the ore-bearing sediments, was established. In the core section sampled beyond the ore field, the composition of foraminiferal assemblages differs insignificantly from typical oceanic ones.
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Original Russian Text © T.A. Khusid, N.S. Os’kina, N.P. Lukashina, I.F. Gablina, N.V. Libina, A.G. Matul, 2018, published in Stratigrafiya, Geologicheskaya Korrelyatsiya, 2018, Vol. 26, No. 1, pp. 115–126.
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Khusid, T.A., Os’kina, N.S., Lukashina, N.P. et al. Benthic and Plankton Foraminifers in Hydrothermally Active Zones of the Mid-Atlantic Ridge (MAR). Stratigr. Geol. Correl. 26, 109–120 (2018). https://doi.org/10.1134/S0869593817060041
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DOI: https://doi.org/10.1134/S0869593817060041