Radiolarian biostratigraphic scheme and stable oxygen isotope stratigraphy in southern Japan (IODP Expedition 315 Site C0001)

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doi: 10.1127/0078-0421/2014/0044
Author(s): Matsuzaki, Kenji M.; Nishi, Hiroshi; Hayashi, Hiroki; Suzuki, Noritoshi; Gyawali, Babu R.; Ikehara, Minoru; Tanaka, Takuyuki; Takashima, Reishi
Author Affiliation(s): Primary:
Center for Academic Resources and Archives Tohoku University Museum, Japan
Shimane University, Japan
Kochi University, Japan
Volume Title: Newsletters on Stratigraphy
Source: Newsletters on Stratigraphy, 47(1), p.107-130. Publisher: Gebrüder Bornträger, Berlin-Stuttgart, Germany. ISSN: 0078-0421 CODEN: NLSGAO
Note: In English. 60 refs.; illus., incl. 5 tables, 1 plate
Summary: The Kuroshio Current plays a major role in the paleoceanographic characteristics of the Pacific Ocean south of Japan due to of the large quantities of heat and tropical oligotrophic warm water that it transports. However, there is currently no data describing Pleistocene radiolarian biostratigraphy in this region. This study examined Pleistocene radiolarian biostratigraphy in southwestern Japan using cores from the Nankai Trough region that were collected as part of Expedition 315, Integrated Ocean Drilling Program (IODP). We identified 70 radiolarian species (> 63 µm) that were useful for biostratigraphic studies. Oxygen isotope analyses were performed to establish the chemostratigraphy and to construct an age model for this site. The age model, which was based on biostratigraphy, oxygen isotope stratigraphy, and magnetostratigraphy, revealed that the geological age of the study site ranged from 0.30 Ma (Middle Pleistocene) to 1.80 Ma (Early Pleistocene). Sedimentation rate of 39.43 cm/kyr was observed from 83 m logging depth below seafloor (LSF) to 106 m LSF. Six bioevents, including two new first occurrence datums for the collodarian Si pho no sphaera abyssi (1.44 Ma) and the spumellarian Actinomma archadophorum (0.64 Ma) were identified. For the first time, five radiolarian zones were identified in the southwestern Japan. In these five radiolarian zones, three new Lower Pleistocene radiolarian zones were defined: Sphaeropyle robusta Zone (> 1.80 Ma); Polyselonia spinosa Zone (1.75-1.44 Ma), Siphonosphaera abyssi Zone (1.44-0.94 Ma). In addition, the Stylatractus universus Zone and Botryostrobus acquilonaris Zone were placed in the Middle Pleistocene.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Asia; Biostratigraphy; Biozones; C-14; Carbon; Cenozoic; Clastic sediments; Clay; Currents; Expedition 315; Far East; Foraminifera; IODP Site C0001; Igneous rocks; Integrated Ocean Drilling Program; Invertebrata; Isotopes; Japan; Kuroshio; Microfossils; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Ocean Drilling Program; Ocean currents; Pacific Ocean; Pleistocene; Protista; Pyroclastics; Quaternary; Radioactive isotopes; Radiolaria; Sedimentation; Sedimentation rates; Sediments; Silt; Volcanic ash; Volcanic rocks; West Pacific
Coordinates: N331400 N331400 E1364300 E1364300
Record ID: 2017044310
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany