Site U1430

Tada, Ryuji; Murray, R. W.; Zarikian, C.A. Alvarez; Anderson, William T.; Bassetti, Maria Angela; Brace, B.J.; Clemens, S.C.; Gurgel, M.H. da Costa; Dickens, G. R.; Dunlea, Ann G.; Gallagher, S.J.; Giosan, Liviu; Henderson, A.C.G.; Holbourn, Ann; Ikehara, Ken; Irino, Tomohisa; Itaki, Takuya; Karasuda, Akinori; Kinsley, Christopher W.; Kubota, Yoshimi; Lee, G.S.; Lee, K.E.; Lofi, Johanna; Lopes, C.I.C.D.; Peterson, L.C.; Saavedra‐Pellitero, Mariem; Sagawa, Takuya; Singh, Raj K.; Sugisaki, Saiko; Toucanne, Samuel; Wan, Sui; Xuan, Chuang; Zheng, Hairong; Ziegler, Martin

doi:10.2204/iodp.proc.346.110.2015

Cited by 6 publications

(28 citation statements)

References 28 publications

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“…Site U1430 is located on the southern slope of the eastern South Korean Plateau (1083 m below sea level) at 37°54.16′ N and 131°32.25′ E. As above, the lithology of the sediment cores at Site U1430 is described following Tada et al (2015b) (Fig. 5).…”

Section: Sites Studiedmentioning

confidence: 99%

“…Sediment cores were collected from seven sites covering wide latitudinal and depth ranges in the Japan Sea. We selected samples collected at Sites U1425 and U1430 in the central and southcentral parts of the Japan Sea during IODP Expedition 346 because hemipelagic sediments covering the middle Miocene to Pliocene were retrieved (Tada et al 2015a(Tada et al , 2015b. We analyzed 154 sediment core samples collected at Site U1425 (about 2000 m deep) and 51 samples collected at Site U1430 (about 1000 m deep) to reconstruct past paleoceanography of the Japan Sea since the late Miocene.…”

Section: Objective and Strategymentioning

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%

“…This unit is divided into two subunits (IIA and IIB) based on the diatom content. Preliminary studies using biostratigraphic data suggest that subunit IIB (103-76 m CCSF-D; 7.891-4.100 Ma) corresponds to a hiatus (Tada et al 2015b;Kamikuri et al 2017). Subunit IIA (ca.…”

Section: Sites Studiedmentioning

confidence: 99%

“…However, because a hiatus of 2.7 Myr was encountered between 7.2 and ca. 4.5 Ma (Tada et al 2015b;Kamikuri et al 2017), only F-slides were mounted, and selected taxa were counted to strengthen the significance of the data obtained from Site U1425.…”

Section: Assemblage Analysismentioning

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: Objective and Strategymentioning

confidence: 99%

Section: Sites Studiedmentioning

confidence: 99%

Section: Sites Studiedmentioning

confidence: 99%

Section: Assemblage Analysismentioning

confidence: 99%

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