International correlation of the Pliensbachian/Toarcian (Lower Jurassic) ammonoid biostratigraphy of the Nishinakayama Formation in the Toyora Group, southwest Japan

Nakada, Kentaro; Matsuoka, Atsushi

doi:10.1127/0078-0421/2011/0006

Cited by 18 publications

(40 citation statements)

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“…The biostratigraphic framework for the Tabe basin has a long history (e.g. Matsumoto and Ono, 1947;Hirano, 1973), and the latest refinements of Nakada and Matsuoka (2011) established three key ammonite zones within the Nb member of the Sakuraguchi-dani succession: the Palparites paltus Zone, the Dactylioceras helianthoides Zone, and the Harpoceras inouyei Zone (Nakada and Matsuoka, 2011;Fig. 2).…”

Section: Geological Setting and International Correlationmentioning

confidence: 98%

“…2). Nakada and Matsuoka (2011) originally recognised the first occurrence of H. inouyei coeval with the first occurrence of Cleviceras cf. exaratum in the succession, and on this basis correlated this level with the base of the Cleviceras exaratum Subzone in Northern Europe.…”

Section: Geological Setting and International Correlationmentioning

confidence: 98%

“…1B) where these rocks form part of the fill of the Tabe Basin. In the northern part of the basin, the Nishinakayama Formation consists of PliensbachianToarcian shallow marine silty shale, mudstone and fine-grained sandstone (Tanabe et al, 1982;Nakada and Matsuoka, 2011). Following Tanabe et al (1982) and Izumi et al (2012), this formation can be subdivided into three members: Na (silty shale,~90 m thick), Nb (predominantly dark silty shale but with intercalated fine-grained sandstone and laminated, organic-rich shale,~160 m thick), and Nc (alternating sandstone and mudstone,~20-60 m thick) (Tanabe et al, 1982;Izumi et al, 2012).…”

Section: Geological Setting and International Correlationmentioning

confidence: 99%

“…2). Nakada and Matsuoka (2011), and subsequently Izumi et al (2012), defined a correlation between this scheme and the Northern European standard (e.g. Page, 2003) that placed the base of the P. paltus Zone at the Pliensbachian-Toarcian boundary (i.e.…”

Section: Geological Setting and International Correlationmentioning

confidence: 99%

“…B. Map of Japan showing location of studied Sakuraguchi-dani succession (Yamaguchi prefecture). C. Geological map of field area in the Tabe Basin (modified afterNakada and Matsuoka, 2011), with Sakuraguchi-dani area highlighted.…”

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confidence: 99%

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Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

Kemp

Izumi

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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a b s t r a c tThe early Toarcian oceanic anoxic event (OAE) was a significant palaeoenvironmental perturbation that led to marked changes in ocean chemistry and climate, and which also had a long-lasting impact on marine ecosystems. The global significance of the event has been recognised from the widespread occurrence of a~3-7‰ negative excursion in the carbon-isotope (δ 13 C) composition of marine organic and inorganic matter and terrestrial plant material. This feature of the event is indicative of a pronounced perturbation to the global carbon cycle; an inference further supported by widespread evidence for seawater deoxygenation and elevated rates of organic carbon burial. Nevertheless, the precise palaeoenvironmental impacts of this event from sections outside of the Boreal and Tethyan realms are uncertain. Here, we present the results of a multiproxy geochemical study of an expanded record of the early Toarcian event from the northwest Panthalassa Ocean margin exposed in southwest Japan (Toyora area, Yamaguchi prefecture). Our results indicate that in the studied succession, organic matter enrichment persisted through the early Toarcian event, but elemental redox proxies do not support persistent seawater anoxia. Analyses of terrigenously derived major and trace element abundances coupled with sedimentological observations reveal an increase in coarse-grained sediment close to the onset of a~−4‰ excursion in δ 13 C org , and coincident with an inferred increase in terrestrial organic matter flux. These observations are consistent with previously published evidence for a marked strengthening of hydrological cycling and increased runoff that occurred contemporaneously with abrupt warming at the onset of the carbon isotope event.

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Section: Geological Setting and International Correlationmentioning

confidence: 98%

Section: Geological Setting and International Correlationmentioning

confidence: 98%

Section: Geological Setting and International Correlationmentioning

confidence: 99%

Section: Geological Setting and International Correlationmentioning

confidence: 99%

mentioning

confidence: 99%

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Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

Kemp

Izumi

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Palaeogeographic and tectonic setting of the Lower Jurassic (Pliensbachian‐Toarcian) Nishinakayama Formation, Toyora Group, SW Japan

et al. 2019

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The palaeogeographic and tectonic setting of the Lower Jurassic Nishinakayama Formation (Toyora Group, southwest Japan) is interpreted based on new U–Pb ages for detrital zircon grains separated from a sandstone sample, combined with available provenance data. The newly obtained age spectrum of detrital zircon grains is characterized by multiple age clusters. Specifically, (1) nearly syndepositional (Lower Jurassic; 182–200 Ma), (2) Early Permian to Late Triassic (205–288 Ma), and (3) Precambrian (1,855–2,660 Ma). The youngest zircon age (182.4 ± 5.1 Ma) is consistent with the biostratigraphically constrained depositional age (falciferum ammonite Zone, lower Toarcian). The presence of a near‐syndepositional age cluster, as well as the presence of volcanic tuff layers in the studied succession, indicates the likely extensive influence of an active volcanic arc in the depositional area. The age cluster of 205–288 Ma suggests, in contrast, that older granitic batholiths were also being sourced. Precambrian detrital zircon grains would have been derived from continental blocks with mainly Proterozoic crusts, most likely from the North China Craton. When combined with available geochemical, petrological, and palaeontological data, our detrital zircon data demonstrate that deposition of the Nishinakayama Formation was located at an active continental margin, possibly close to the northern extremity of the South China Craton. Abundant terrigenous clastics were likely supplied to the sedimentary basin from the Qinling‐Dabieshan‐Sulu Suture Zone, which was formed by the collision of the North and South China cratons.

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Sedimentary evidence for enhanced hydrological cycling in response to rapid carbon release during the early Toarcian oceanic anoxic event

Izumi

Kemp

Itamiya

et al. 2018

Earth and Planetary Science Letters

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International correlation of the Pliensbachian/Toarcian (Lower Jurassic) ammonoid biostratigraphy of the Nishinakayama Formation in the Toyora Group, southwest Japan

Cited by 18 publications

References 0 publications

Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

Palaeogeographic and tectonic setting of the Lower Jurassic (Pliensbachian‐Toarcian) Nishinakayama Formation, Toyora Group, SW Japan

Sedimentary evidence for enhanced hydrological cycling in response to rapid carbon release during the early Toarcian oceanic anoxic event

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