Foraminifers in Late PleistoceneHolocene Sediments
of the Deryugin Basin of the Sea of Okhotsk

T. A. Khusid, N. V. Belyaeva, M. P. Chekhovskaya, and A. G. Matul

Shirshov Institute of Oceanology, Russian Academy of Sciences (IO RAN), Nakhimovskii pr. 36, Moscow, 117997 Russia

E-mail: tkhusid@ocean.ru

Received March 3, 2008; in final form, May 15, 2008

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 cool-
ing; 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.

DOI: 10.1134/S0001437009050129

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