Orbital-scale benthic foraminiferal oxygen isotope stratigraphy at the northern Bering Sea Slope Site U1343 (IODP Expedition 323) and its Pleistocene paleoceanographic significance

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doi: 10.1016/j.dsr2.2014.01.004
Author(s): Asahi, Hirofumi; Kender, S.; Ikehara, Minoru; Sakamoto, Tatsuhiko; Takahashi, Kozo; Ravelo, A. Christina; Alvarez Zarikian, Carlos A.; Khim, B. K.; Leng, M. J.
Author Affiliation(s): Primary:
Pusan National University, Marine Research Institute, Busan, South Korea
Other:
British Geological Survey, United Kingdom
Kochi University, Japan
Mie University, Japan
Hokusei Gakuen University, Japan
University of California at Santa Cruz, United States
Texas A&M University, United States
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.66-83. Publisher: Elsevier, Oxford, International. ISSN: 0967-0645
Note: In English. Includes appendices. 76 refs.; illus., incl. 1 table, sketch map
Summary: A continuous composite oxygen isotope (δ18O) stratigraphy from benthic foraminifera in the Bering Sea was reconstructed in order to provide insight into understanding sea-ice evolution in response to Northern Hemisphere Glaciation. Oxygen isotope records from multiple species of benthic foraminifera at Integrated Ocean Drilling Program (IODP) Expedition 323 Site U1343 (54°33.4'N, 176°49.0'E, water depth 1950 m) yield a highly refined orbital-scale age model spanning the last 1.2 Ma, and a refined age model between 1.2 and 2.4 Ma. An inter-species calibration was used to define species offsets and to successfully obtain a continuous composite benthic δ18O record, correlated with the global composite benthic δ18O stack curve LR04 to construct an orbital-scale age model. The consistency of the benthic δ18O stratigraphy with biostratigraphy and magnetostratigraphy confirms the reliability of both methods for constraining age. The time difference between cyclic changes in sedimentary physical properties and glacial-interglacial cycles since 0.8 Ma is notable, and suggests that physical properties alone cannot be used to construct an orbital-scale age model. Amplitude changes in physical properties and a significant drop in the linear sedimentation rate during glacials after 0.9 Ma indicate that the glacial sea-ice edge extended beyond the Bering Sea Slope (Site U1343) at this time. 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; Cenozoic; Chemostratigraphy; Climate forcing; Cores; Expedition 323; Foraminifera; Fourier analysis; IODP Site U1343; Ice; Integrated Ocean Drilling Program; Invertebrata; Isotope ratios; Isotopes; Lithostratigraphy; Marine sediments; Microfossils; Neogene; North Pacific; O-18/O-16; Orbital forcing; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Periodicity; Pleistocene; Pliocene; Protista; Quaternary; Sea ice; Sediments; Stable isotopes; Tertiary; Wavelets
Coordinates: N573324 N573324 W1754900 W1754900
Record ID: 2017013126
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands