History of the inflow of the warm Tsushima Current into the Sea of Japan between 3.5 and 0.8 Ma

Kitamura, Akihiro; Kimoto, Katsunori

doi:10.1016/j.palaeo.2005.11.015

Cited by 121 publications

(80 citation statements)

References 45 publications

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“…2 G. inflata beds, it is not found in the No. 3 G. inflata bed (e.g., Kitamura and Kimoto 2006). Similarly, the Pulleniatina group, which is characteristic of Kuroshio water, is also absent from the No.…”

Section: Planktonic Foraminiferamentioning

confidence: 99%

“…Numbers in parentheses for each district correspond to the numbers in squares in Figs (Koizumi 1992a), radiolarians from ODP site 794 (Itaki, unpublished data), calcareous nannofossils from ODP site 798 (Muza 1992), and benthic and planktonic foraminifera from ODP site 798 (Kato 1992) are illustrated. Opal (Dunbar et al 1992) and calcium carbonate contents (Ingle Jr et al 1990) from ODP site 798 are also shown (Sato et al 2012); e subtropical planktonic foraminifera G. ruber from on-land sections in the Hokuriku district (Kitamura and Kimoto 2006); f coiling ratio of N. pachyderma from ODP site 798 (Kheradyar 1992); g calcium carbonate contents from ODP site 798; h Td'-based sea surface temperatures (SST) from ODP site 797 (central Japan Sea) and DSDP site 436 (northwestern Pacific) (Koizumi and Yamamoto, in press); and i warm-water diatoms and mollusks from on-land sections in the Niigata district (Yanagisawa and Amano 2003) 2.1 Ma, warm-water species existed alongside the cold-water assemblage at 3.2-2.7 Ma and 2.4-2.0 Ma, suggesting the presence of mixed cold and warm water during those intervals (Fig. 6 (i)).…”

Section: Jeju Islandmentioning

confidence: 99%

“…In contrast, the occurrence of abundant G. inflata without G. ruber or other Kuroshio indicators in the No. 3 G. inflata bed suggests that the plankton assemblage entered the Japan Sea with temperate water via the northern strait (Hanagata and Watanabe 2001;Miwa et al 2004aMiwa et al , 2004bKitamura and Kimoto 2006;Hanagata 2007). During the Late Pliocene interval corresponding to the No.…”

Section: Planktonic Foraminiferamentioning

confidence: 99%

“…This warmer Pliocene SST probably allowed a northward shift in the G. inflata distribution, resulting in its higher abundance around the mouth of the northern strait. Kitamura and Kimoto (2006) reconstructed the history of the TWC from the occurrences of the subtropical species G. ruber and other warm-water fossils from 3.5 to 0.8 Ma in on-land sections along the western coast of Honshu Island. Because G. ruber occurred only sporadically during the interglacial periods before 1.7 Ma, they inferred its very limited transport by the TWC before that date.…”

Section: Planktonic Foraminiferamentioning

confidence: 99%

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Transitional changes in microfossil assemblages in the Japan Sea from the Late Pliocene to Early Pleistocene related to global climatic and local tectonic events

Itaki

2016

Prog. in Earth and Planet. Sci.

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Many micropaleontological studies based on data from on-land sections, oil wells, and deep-sea drilling cores have provided important information about environmental changes in the Japan Sea that are related to the global climate and the local tectonics of the Japanese Islands. Here, major changes in the microfossil assemblages during the Late Pliocene to Early Pleistocene are reviewed. Late Pliocene (3.5-2.7 Ma) surface-water assemblages were characterized mainly by cold-temperate planktonic flora and fauna (nannofossils, diatoms, radiolarians, and planktonic foraminifera), suggesting that nutrient-rich North Pacific surface waters entered the Japan Sea via northern straits. The common occurrence of Pacific-type deep-water radiolarians during this period also suggests that deep water from the North Pacific entered the Japan Sea via the northern straits, indicating a sill depth >500 m. A weak warm-water influence is recognized along the Japanese coast, suggesting a small inflow of warm water via a southern strait. Nannofossil and sublittoral ostracod assemblages record an abrupt cooling event at 2.75 Ma that correlates with the onset of the Northern Hemisphere glaciation. Subsequently, cold intermediate-and deep-water assemblages of ostracods and radiolarians increased in abundance, suggesting active ventilation and the formation of the Japan Sea Proper Water, associated with a strengthened winter monsoon. Pacific-type deep-water radiolarians also disappeared around 2.75 Ma, which is attributed to the intermittent occurrence of deep anoxic environments and limited migration from the North Pacific, resulting from the near-closure or shallowing of the northern strait by a eustatic fall in sea level and tectonic uplift of northeastern Japan. A notable reduction in primary productivity from 2.3 to 1.3 Ma also suggests that the nutrient supply from the North Pacific was restricted by the near-closure of the northern strait. An increase in the abundance of subtropical surface fauna suggests that the inflow of the Tsushima Warm Current into the Japan Sea via a southern strait began at 1.7 Ma. The opening of the southern strait may have occurred after the subsidence of southwestern Japan.

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Section: Planktonic Foraminiferamentioning

confidence: 99%

Section: Jeju Islandmentioning

confidence: 99%

Section: Planktonic Foraminiferamentioning

confidence: 99%

Section: Planktonic Foraminiferamentioning

confidence: 99%

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Transitional changes in microfossil assemblages in the Japan Sea from the Late Pliocene to Early Pleistocene related to global climatic and local tectonic events

Itaki

2016

Prog. in Earth and Planet. Sci.

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“…3.5 Ma Tada, 19943.5 Ma , , 2003, 2004a, b;Kitamura and Kimoto, 2006;Irizuki et al, 2007;, 2007; , 1949; , 1985; , 1988, 1991; , 1995; , 2008 1995 --, 1988 Type Shimizu and Fujii (1995) and Amano et al (2008 …”

mentioning

confidence: 99%

Fission track age for MT1 tuff bed and paleoenvironment in the Upper Pliocene Mita Formation, Toyama Prefecture, central Japan

Goto¹,

Nasuno²,

Irizuki³

et al. 2014

Jour. Geol. Soc. Japan

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The Pliocene Mita Formation outcrops in the Yatsuo-machi area of Toyama City, Toyama Prefecture, Japan. This formation contains three key tuff beds (OT , MT , and MT ); two of these beds, OT and MT , previously yielded ages of .. Ma and . -. Ma, respectively. This study focuses on the geology of the area surrounding the Akae-gawa River in the Hirabayashi region, and provides new fission track ages for the MT tuff exposed at two study sites in this area. These new data are combined with new fossil ostracod and planktonic foraminiferal faunal data to reconstruct the paleoenvironment during deposition of the MT tuff. This study presents new ages of .. and . . Ma for the MT tuff at the two sites that form the focus of this study. Integrating these data with the results of previous studies indicates that the first warm-water molluscs within the Mita Formation lived between . and ca. . Ma. Microfossil assemblage data from the study area also indicate that the paleoenvironment in the study site changed from a cool-water bay or shallow sea to an open temperate shallow sea setting, with warm-water ostracod species present in the uppermost horizon of the formation.

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Japan: Honshu, Shikoku, and Kyushu

2021

Evolution of Island Mammals

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History of the inflow of the warm Tsushima Current into the Sea of Japan between 3.5 and 0.8 Ma

Cited by 121 publications

References 45 publications

Transitional changes in microfossil assemblages in the Japan Sea from the Late Pliocene to Early Pleistocene related to global climatic and local tectonic events

Transitional changes in microfossil assemblages in the Japan Sea from the Late Pliocene to Early Pleistocene related to global climatic and local tectonic events

Fission track age for MT1 tuff bed and paleoenvironment in the Upper Pliocene Mita Formation, Toyama Prefecture, central Japan

Japan: Honshu, Shikoku, and Kyushu

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