Radiolarian Biostratigraphy from Middle Miocene to Late Pleistocene in the Japan Sea

Kamikuri, Shin-ichi; Itaki, Takuya; Motoyama, Isao; Matsuzaki, Kenji M.

doi:10.2517/2017pr001

Cited by 32 publications

(41 citation statements)

References 36 publications

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“…A fine lamination of diatom ooze occurring within a dark organic-rich layer extending to a thickness of about 1.5 m has been recognized at 275 m core depth below seafloor (CSF-A) (Tada et al 2015a), which corresponds to about 287 m CCSF-D (Irino et al 2018). Based on the age model of Kamikuri et al (2017), these laminations occurred about 8 Ma. Lithological unit II corresponds to a depth interval between ca.…”

Section: Sites Studiedmentioning

confidence: 99%

“…However, because a hiatus is present between 7.2 and ca. 4.5 Ma at Site U1430 (Kamikuri et al 2017;Tada et al 2015b), most of the analysis was conducted on samples from Site U1425. In this study, we only used data from Site U1430 to provide supporting information.…”

Section: Sites Studiedmentioning

confidence: 99%

“…262 and Fig. 3 Radiolarian absolute abundance (AB) (skel/g) and relative abundance (%) of selected radiolarian species (1/2) at Site U1425 plotted by age (Ma) (Kamikuri et al 2017 depth age model) and compared to the lithological units of Tada et al (2015a). Narrow red shading on the AB curve corresponds to the mean AB for each lithological subunit 99 m CCSF-D (7.419-2.722 Ma) ( Figs.…”

Section: Sites Studiedmentioning

confidence: 99%

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Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Matsuzaki

Itaki

Tada

et al. 2018

Prog Earth Planet Sci

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Previous studies showed that the evolution of the Japan Sea paleoceanography since the Miocene has been influenced by the regional tectonism (e.g., opening/closing of the connecting seaways) and regional/global climate. In the Japan Sea, Expedition 346 of the Integrated Ocean Drilling Program (IODP) retrieved core sediments dating back to the Miocene at two sites (U1425 and U1430). In this study, we reconstruct shallow-to-deep-water hydrography of the Japan Sea during the Mio-Pliocene based on radiolarian assemblages at Sites U1425 and U1430 considering the local tectonism and changes in global/regional climate. Our data suggest that glacioeustatic sea-level changes have probably had an influence on the local paleoceanography between 9.5 and 7.0 Ma. Indeed, warm water probably flowed from the North Pacific into the Japan Sea when sea level was high via shallow central and eastern seaways. In addition, the sill depth of the northern seaway was probably close to 1000 m between 9.5 and 7.8 Ma and had probably allowed inflow of oxygen minimum zone water from the North Pacific to the Japan Sea when sea level was high. In contrast, our data imply that Cycladophora nakasekoi, an endemic species to the Japan Sea, dominated between 9.5 and 7.3 Ma when sea level was low. Our data also suggest a progressive shoaling of the sill for the period since 7.8 Ma and that global climatic events such as such the late Miocene cooling (7.5-5.5 Ma) and the early Pliocene warmth have had a sustained influence on the Japan Sea. During the mid-Pliocene, a deep cooling of the subsurface to intermediate water of the Japan Sea likely occurred because species related to subarctic subsurface to intermediate waters were dominant between 5 and 3.8 Ma. The Northern Hemisphere Glaciation (ca. 3.0-2.7 Ma) and Mid-Pleistocene Transition (1.2-0.8 Ma) have both likely intensified the cooling of the Japan Sea.

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Section: Sites Studiedmentioning

confidence: 99%

Section: Sites Studiedmentioning

confidence: 99%

Section: Sites Studiedmentioning

confidence: 99%

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Paleoceanographic history of the Japan Sea over the last 9.5 million years inferred from radiolarian assemblages (IODP Expedition 346 Sites U1425 and U1430)

Matsuzaki

Itaki

Tada

et al. 2018

Prog Earth Planet Sci

Self Cite

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“…The sediment cores collected in the Japan Sea cover the Holocene to the middle Miocene (e.g. Tada et al, 2015;Kamikuri et al, 2017). Polycystine radiolarians are Protista bearing skeletons of amorphous silica and they are the unique microfossil group, which can inhabit intermediate and deep-water .…”

Section: Introductionmentioning

confidence: 99%

“…Ujiie and Ichikura, 1973), whereas radiolarians are usually well-preserved in such carbonatepoor sediments in the Japan Sea. Therefore, polycystine radiolarians were examined at all sites recovered in the Japan Sea during the expedition 346 to define their local biostratigraphy and establish a preliminary depth-age model at each drilled site (Kamikuri et al, 2017). In this study, we propose to show micro-photographs of the radiolarian species and/or species group, which often occurred from the upper Miocene of IODP Exp.…”

Section: Introductionmentioning

confidence: 99%