Abstract
The biofacies analysis of benthic foraminifers in sediments of the Sea of Okhotsk paleobasin revealed the presence of typical abyssal species in their Oligocene-Miocene assemblages that are missing in the Pliocene and Pleistocene section. The development of the abyssal fauna in the Sea of Okhotsk was determined by its relatively large depths (>2000 m) and intense water exchange with the Pacific Ocean. The Sakhalin folding phase at the Neogene-Quaternary transition resulted in the uplifting of the Japan-Kurile cordillera and separation of deep basins of the Japan and Okhotsk seas from the ocean, which was responsible for the formation of unfavorable conditions for migration and existence of the Pacific abyssal fauna. The taxonomic similarity and general tendencies in the development of the Neogene benthic foraminifers common for the Japan and Okhotsk seas imply the lack of narrow and shallow thresholds between these basins similar to the present-day Nevel’skoi, La Pérouse, and Sangar straits. Such bottom topography stimulated the intense northward water flow, which determined the similarity between the benthic foraminiferal assemblages of the Japanese and Okhotsk paleobasins.
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Original Russian Text © S.P. Pletnev, 2009, published in Tikhookeanskaya Geologiya, 2009, Vol. 28, No. 2, pp. 17–26.
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Pletnev, S.P. Depths of the Sea of Okhotsk sedimentary basin in the Cenozoic. Russ. J. of Pac. Geol. 3, 118–127 (2009). https://doi.org/10.1134/S181971400902002X
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DOI: https://doi.org/10.1134/S181971400902002X