Bering Sea radiolarian biostratigraphy and paleoceanography at IODP Site U1341 during the last four million years

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doi: 10.1016/j.dsr2.2015.03.004
Author(s): Ikenoue, Takahito; Okazaki, Yusuke; Takahashi, Kozo; Sakamoto, Tatsuhiko
Author Affiliation(s): Primary:
Kyushu University, Department of Earth and Planetary Sciences, Higashi-ku, Japan
Mie University, Japan
Volume Title: Plio-Pleistocene paleoceanography of the Bering Sea
Volume Author(s): Takahashi, Kozo, editor; Ravelo, A. Christina; Okazaki, Yusuke
Source: Plio-Pleistocene paleoceanography of the Bering Sea, edited by Kozo Takahashi, A. Christina Ravelo and Yusuke Okazaki. Deep-Sea Research. Part II: Topical Studies in Oceanography, Vol.125-126, p.38-55. Publisher: Elsevier, Oxford, International. ISSN: 0967-0645
Note: In English. Includes appendices. 101 refs.; illus., incl. 4 plates, 3 tables, sketch map
Summary: Radiolarian assemblages in sediment cores were investigated at the Integrated Ocean Drilling Program Site U1341 on Bowers Ridge in the southern Bering Sea. Radiolarian biozones at Site U1341 spanned the last 4 My from the youngest Amphimelissa setosa Zone (late Quaternary), via the Stylatractus universes Zone, the Eucyrtidium matuyamai Zone and a part of the Cycladophora sakaii Zone (middle to late Pliocene). The A. setosa Zone, newly proposed in this paper, is well correlated with the Botryostrobus aquilonaris Zone in the North Pacific Ocean. The bottom of the S. universus and top of the E. matuyamai Zones are emended in this paper by using the first common occurrence of A. setosa. Seventeen radiolarian datum points were identified at Site U1341 and tied to the geomagnetic and oxygen isotope stratigraphy. Radiolarian assemblages during the last 4 My showed a turnover from subarctic-transitional species (Spongopyle osculosa and Larcopyle buetschlii) to subarctic species (Ceratospyris borealis) between 3.6 and 2.4 Ma, corresponding to the intensification of the Northern Hemisphere Glaciation (NHG). Recent polar species (A. setosa and Actinomma boreale) appeared abundantly after the Mid-Pleistocene Transition (MPT, 1.2-0.8 Ma). Repeated numbers of individual peaks of the abundances of Cycladophora davisiana, dwelling in cold and well-ventilated intermediate water, suggest intermediate to deep water formation in the Bering Sea during the last 1 My. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Bering Sea; Biostratigraphy; Bowers Ridge; Cenozoic; Cores; Expedition 323; IODP Site U1341; Integrated Ocean Drilling Program; Invertebrata; Marine sediments; Microfossils; Neogene; North Pacific; Northwest Pacific; Pacific Ocean; Paleo-oceanography; Pleistocene; Pliocene; Protista; Quaternary; Radiolaria; Sediments; Tertiary; West Pacific
Coordinates: N540200 N540200 E1790031 E1790031
Record ID: 2017013124
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands