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Data report: Pleistocene radiolarian biostratigraphy, IODP Expedition 346 Site U14271

Takuya Itaki,2 Takuya Sagawa,2 and Yoshimi Kubota3


Quantitative analysis of radiolarian assemblages was conducted on sediment cores collected from the seafloor during Integrated Ocean Drilling Program Expedition 346. During Expedition 346, Site U1427 was cored in the shelf region of the Yamato Basin, southern Japan Sea, to 570 m core composite depth below seafloor (CCSF-A) in Hole U1427A. Radiolarian biostratigraphy conducted for this site identified four datum levels: last occurrence (LO) of Lychnocanomma sakaii (0.054 Ma), LO of Amphimelissa setosa (0.085 Ma), LO of Schizodiscus japonicus (0.29 Ma), and first occurrence (FO) of Amphimelissa setosa (~1.48 Ma). In addition, the abundance maxima of subtropical water species, which indicate migration of the Tsushima Warm Current from the East China Sea associated with eustatic sea level rise during interglacial periods, are most likely correlated with the marine isotope stages during the past 1.5 My.

1 Itaki, T., Sagawa, T., and Kubota, Y., 2018. Data report: Pleistocene radiolarian biostratigraphy, IODP Expedition 346 Site U1427. In Tada, R., Murray, R.W., Alvarez Zarikian, C.A., and the Expedition 346 Scientists, Proceedings of the Integrated Ocean Drilling Program, 346: College Station, TX (Integrated Ocean Drilling Program).

2 AIST, Geological Survey of Japan, Higashi 1-1-1, Tsukuba Central 7, Ibaraki 305-8567, Japan. Correspondence author:

3 Department of Geology and Paleontology, National Museum of Nature and Science, Amakubo 4-1-1, Tsukuba, Ibaraki 305-0005, Japan.

Initial receipt: 7 February 2017
Acceptance: 15 February 2018
Publication: 2 May 2018
MS 346-202