Foraminifers in late Pleistocene-Holocene sediments of the Deryugin Basin of the Sea of Okhotsk |
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Authors: | T A Khusid N V Belyaeva M P Chekhovskaya A G Matul |
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Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences (IO RAN),Moscow,Russia |
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Abstract: | The study of foraminifers from sediments accumulated during the last 30 ky revealed their similar distribution in the central
and marginal parts of the Deryugin Basin, which implies similar environmental changes throughout this morphological structure.
The lack or extreme taxonomical impoverishment of the benthic foraminiferal assemblages during the Last Glacial Maximum indicates
a combination of several factors: the significant deterioration of the parameters controlling their bioproductivity in response
to the general cooling; the development of anoxic bottom conditions; and, probably, the unfavorable influence of cold barite-methane
seeps on the geochemical parameters of the bottom waters. The weaker activity of these seeps in the central part of the basin
during the Holocene is evident from some deviations in the structure of the benthic foraminiferal assemblages against the
background of their general taxonomic similarity. |
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