Effects of late Neogene climatic cooling on North Pacific radiolarian assemblages and oceanographic conditions

Kamikuri, Shin-ichi; Nishi, Hiroshi; Motoyama, Isao

doi:10.1016/j.palaeo.2007.02.008

Cited by 69 publications

(44 citation statements)

References 43 publications

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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%

“…The LO of A. robustum (1.55 ± 0.1 Ma), defined by Kamikuri et al (2004Kamikuri et al ( , 2007, was identified. This bioevent was situated between samples 341-U1417A, 19H-5, 50-52 cm and U1417C, 20H-6, 50-52 cm at a median depth of 170.29 m CCSF-B (Fig.…”

Section: Radiolarian Zonesmentioning

confidence: 99%

“…Correlation and ages: The base of this zone is defined by the FO of E. matuyamai, which is typically located near the C2n (Olduvai) paleomagnetic reversal event (e.g., Kamikuri et al, 2004Kamikuri et al, , 2007Matsuzaki et al, 2014b). The top of this zone is defined by the LO of E. matuyamai placed between paleomagnetic reversal event C1r.2n (M) (Cobb Mountain) and the top of C1r.1n (T) (Jaramillo).…”

Section: Radiolarian Zonesmentioning

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%

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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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Section: Bioevents and Age Modelmentioning

confidence: 99%

Section: Radiolarian Zonesmentioning

confidence: 99%

Section: Radiolarian Zonesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Radiolarian stratigraphy at Site U1340 includes the Botryostrobus aquilonaris Zone (upper Quaternary) to the Dictyophimus bullatus Zone (middle Pliocene) in the subarctic Pacific (Kamikuri et al, 2007). However, the Stylatractus universus Zone (between 0.4 and 0.9 Ma) is missing because of the absence of S. universus, which may be attributed to very low species occurrence or a sedimentary hiatus.…”

Section: Radiolariansmentioning

confidence: 99%