Stratigraphic distribution of the radiolarian Spongodiscus biconcavus Haeckel at IODP Site U1340 in the Bering Sea and its paleoceanographic significance

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doi: 10.1016/j.palwor.2013.11.001
Author(s): Chen Muhong; Zhang Qiang; Zhang Lanlan; Alvarez Zarikian, Carlos; Wang Rujian
Author Affiliation(s): Primary:
Chinese Academy of Sciences, South China Sea Institute of Oceanology, Guangzhou, China
Texas A&M University, United States
Tongji University, China
Volume Title: Palaeoworld
Source: Palaeoworld, 23(1), p.90-104. Publisher: Elsevier Science, Amsterdam, Netherlands. ISSN: 1871-174X
Note: In English. 58 refs.; illus., incl. 1 table, sketch maps
Summary: The temporal and spatial distributions of the radiolarian species Spongodiscus biconcavus Haeckel are investigated to understand the paleoceanographic evolution of the Bering Sea region during the last 4.3 Myr based on extensive study of samples collected at Site U1340 during the IODP Expedition 323. The biostratigraphic resolution for the region is also improved by multidisciplinary studies of radiolarians, diatoms, dinoflagellates, ebridians, and silicoflagellates. The results demonstrate that the abundance variation of S. biconcavus during the last 4.3 Myr is closely related to global climate changes, and the species can be used as a warm water and climate proxy in the Bering Sea. Based on the downhole profiles of S. biconcavus and other parameters, we conclude that the southern Bering Sea was associated with a warm water mass prior to 3.147 Ma but it gradually cooled thereafter. From 2.793 Ma to 0.889 Ma, a cold water mass and sea-ice predominated in the Bering Sea, in response to the early Northern Hemisphere glaciation (NHG). Furthermore, the climate suddenly became much cooler post 0.889 Ma. Nevertheless, a reversal of this cooling trend occurred after the Mid-Pleistocene Climatic Transition (∼1.2 Ma), marked by reoccurrence of warm water and reduced sea-ice in the Bering Sea until the final retreat of warm water mass from the Bering Sea after 0.239 Ma. These processes are correlated with biogeographic expansion and retreat of warm water planktonic species.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Assemblages; Bering Sea; Biostratigraphy; Bowers Ridge; Cenozoic; Diatoms; Dinoflagellata; Ebridians; Expedition 323; Holocene; IODP Site U1340; Integrated Ocean Drilling Program; Invertebrata; Living taxa; Marine environment; Microfossils; Modern analogs; Morphology; Neogene; North Pacific; Northwest Pacific; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Palynomorphs; Plantae; Pleistocene; Pliocene; Protista; Quaternary; Radiolaria; Silicoflagellata; Spongodiscus biconcavus; Taxonomy; Tertiary; West Pacific
Coordinates: N532354 N532354 W1793113 W1793113
Record ID: 2017052072
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands