Late Neogene Radiolarian Biostratigraphy of the Eastern North Pacific ODP Sites 1020/1021

Kamikuri, Shin-ichi

doi:10.2517/2016pr027

Cited by 18 publications

(14 citation statements)

References 42 publications

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“…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%

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%

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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“…We carefully examined several well-known bioevents identified by previous studies in the North Pacific (Matul et al, 2002;Kamikuri et al, 2004Kamikuri et al, , 2007Matsuzaki et al, 2014a, b;Ikenoue et al, 2016;Kamikuri, 2017 …”

Section: Bioevents and Age Modelmentioning

confidence: 99%

“…Of particular interest in the retrieved cores are polycystine radiolarians, which are siliceous microorganisms that inhabit shallow, intermediate and deep waters (e.g., Renz, 1976;Anderson, 1983;Kling, 1979;Kling and Boltovskoy, 1995;Nimmergut and Abelmann, 2002;Okazaki et al, 2004;Suzuki and Not, 2015;Matsuzaki et al, 2016). Their skeletons composed of amorphous silica are generally well-preserved and abundant in the seafloor of the North Pacific, and the high levels of radiolarian preservation and abundance in deep-sea sediments of this region have facilitated numerous paleoceanographic and biostratigraphic studies (e.g., Hays, 1970;Kling, 1973;Foreman, 1975;Morley et al, 1982;Motoyama, 1996;Pisias et al, 1997;Matul et al, 2002;Kamikuri et al, 2004Kamikuri et al, , 2007Matul and Abelmann, 2005;Itaki et al, 2012;Matsuzaki et al, 2014aMatsuzaki et al, -c, 2015aKamikuri, 2017). According to onboard data, radiolarians were very rare in the Pliocene-Miocene sediments collected at Site U1417 (Jaeger et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

Matsuzaki

Suzuki

2018

J. Micropalaeontol.

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Abstract. Expedition 341 of the Integrated Ocean Drilling Program (IODP) retrieved sediment cores spanning the time interval between the Pleistocene and Miocene from the southern Gulf of Alaska. Onboard Pleistocene radiolarian biostratigraphy is hereby refined by increasing the sampling resolution. The 178 core samples from the upper 190 m CCSF-B (Composite Core Depth Scale F-B) of Site U1417 contained faunal elements similar to the northwestern Pacific; for example, the three biozones in the northwestern Pacific (i.e., Eucyrtidium matuyamai, Stylatractus universus and Botryostrobus aquilonaris) were also recognized in the Gulf of Alaska, spanning 1.80-1.13 Ma, 1.13-0.45 Ma, and the last 0.45 Myr, respectively. Based on the age model that we used in this study and the shipboard paleomagnetic reversal events, the first occurrences (FOs) of Amphimelissa setosa and Schizodiscus japonicus in the northeastern Pacific were preliminarily determined to be 1.48 and 1.30 Ma, respectively. The last occurrence (LO) of Eucyrtidium matuyamai and the FO of Lychnocanoma sakaii, both well-established bioevents in the northwestern Pacific, were dated at 0.80 and 1.13 Ma, respectively. The LO of E. matuyamai is a synchronous event at 1.05 ± 0.1 Ma in the North Pacific, while the FOs of A. setosa and S. japonicus at 1.48 and 1.30 Ma, respectively, are significantly older than what has been found elsewhere.

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“…Radiolarians, which is one of the siliceous microfossil group, were found in the sediment recovered from Site 1021, however its preservation of the fauna changed from age to age (Lyle et al, 1997;Kamikuri, 2017). Sediments older than the latest Miocene was relatively abundant in radiolarians, of which preservation was good.…”

Section: Introductionmentioning

confidence: 99%

“…After that, several biostratigaraphic studies of radiolarians were conductive in the eastern North Pacific (Rowell, 1981;Poore et al, 1981;Weaver et al, 1981;Perez-Guzman, 1985;Perez-Guzman and Casey, 1986). Kamikuri (2017) studied biostratigraphic distribution of selected radiolarians from ODP Site 1021 in the eastern North Pacific. The purpose of this study is to present microphotgraphs of all the encountered taxa of the middle to late Miocene age from Site 1021 in the eastern North Pacific in order to analyze the species diversity of radiolarians.…”

Section: Introductionmentioning

confidence: 99%

北東太平洋における国際深海掘削計画（odp）1021 地点の中部および上部中新統から産出した放散虫化石

Kamikuri

2019

Bull. Geol. Surv. Japan

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The purpose of this study is to present microphotgraphs of all the encountered taxa of the middle to late Miocene age from Ocean Drilling Program (ODP) Site 1021 in the eastern North Pacific in order to analyze the species diversity of radiolarians. Totally 149 species or species groups of radiolarians were identified from Site 1021 in the eastern North Pacific. Micro-photographs have been illustrated in the 24 plates, and a new species, Lychnocanoma californica, is described.

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Late Neogene Radiolarian Biostratigraphy of the Eastern North Pacific ODP Sites 1020/1021

Cited by 18 publications

References 42 publications

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

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

Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

北東太平洋における国際深海掘削計画（odp）1021 地点の中部および上部中新統から産出した放散虫化石

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