Confirmation of the Permian/Triassic boundary in deep-sea sedimentary rocks; earliest Triassic condonts from black carbonaceous claystone of the Ubara section in the Tamba Belt, Southwest Japan.

Yamakita, Satoshi; Kadota, Naoki; Kato, Takuya; Tada, Ryuji; Ogihara, Shigenori; Tajika, Eiichi; Hamada, Yoshitaka

doi:10.5575/geosoc.105.895

Cited by 37 publications

(21 citation statements)

References 8 publications

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“…superanoxic event lasting from the middle Permian to the Middle Triassic. Evidence for truly euxinic conditions is confined to the black shale that, recent conodont findings indicate, accumulated from the parvus zone (Yamakita et al, 1999) to some poorly dated interval in the late Griesbachian-Dienerian (Isozaki, 1997). The bounding Toishi claystones clearly record oxygen-poor deposition, but the relatively heavy d 34 S pyr values suggest that euxinicity was not established at this time.…”

Section: Panthalassa Oceanmentioning

confidence: 93%

“…Rather than increased productivity, this could reflect a lower sedimentation rate and thus less clastic dilution in the black shales. However, the best-dated sections suggest that 2 m of black shale accumulated during the Griesbachian-Dienerian Stages (Yamakita et al, 1999), an interval of ϳ3 m.y., at a sedimentation rate of 0.7 m/m.y. In other less-well-dated sections the black shale unit is as much as 15 m thick (Isozaki, 1994).…”

Section: Panthalassa Oceanmentioning

confidence: 97%

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Extent, duration, and nature of the Permian-Triassic superanoxic event

Wignall¹,

Twitchett²

2002

Catastrophic Events and Mass Extinctions: Impacts and Beyond

160

137

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The widespread development of anoxic and dysoxic deposition in marine settings occurred during the Permian-Triassic (P-Tr) transition interval. Facies varied according to paleobathymetry and paleolatitude. Thus, dark gray, uranium-enriched shales characterize deeper shelf locations over wide areas of northern Boreal seas, whereas the oceanic record consists of condensed, organic-rich, black shales. Finely laminated, pyrite-rich, micritic mudstones occur in equatorial Tethyan sections. Contemporaneous dolomitization in many shallow-marine settings provides further indirect evidence for widespread P-Tr anoxia. Similarly, common reports of unusual stromatolites in the earliest Triassic Griesbachian Stage could reflect the widespread occurrence of direct calcite precipitation from carbonate-saturated anoxic bottom waters. Oxygen-poor conditions are first recorded from the Late Permian, deep-water, accreted oceanic terranes of Japan. Such conditions vastly increased in extent in the interval between the latest Permian and the late Griesbachian, when dysaerobic facies developed in all but the shallowest of marine settings. The Panthalassa ocean was probably truly euxinic in this interval. Anoxia was never so extensive or so intense after this interval, and the superanoxic event ceased abruptly in equatorial Tethyan latitudes in the latest Griesbachian. Elsewhere, anoxia persisted at least into the Dienerian Stage in the Perigondwanan shelf sections of the Neo-Tethys, and deep-water anoxia may have persisted in Panthalassa until the middle Triassic.

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Section: Panthalassa Oceanmentioning

confidence: 93%

Section: Panthalassa Oceanmentioning

confidence: 97%

Extent, duration, and nature of the Permian-Triassic superanoxic event

Wignall¹,

Twitchett²

2002

Catastrophic Events and Mass Extinctions: Impacts and Beyond

160

137

View full text Add to dashboard Cite

show abstract

“…The P/Tr succession is a typical deep-sea pelagic sedimentary sequence with very low sedimentation rates deposited in the central Panthalassic Ocean. The P/Tr boundary is defined by the first appearance of the conodont H. parvus in the black carbonaceous claystones (Yamakita et al, 1999). The base of the black carbonaceous claystone is taken as the 0-m point in the measured section for this study.…”

Section: Introductionmentioning

confidence: 99%

Changes in depth-transect redox conditions spanning the end-Permian mass extinction and their impact on the marine extinction: Evidence from biomarkers and sulfur isotopes

Kaiho

Oba

Fukuda

et al. 2012

Global and Planetary Change

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“…Yamakita 1993; Isozaki 1997). The earliest Triassic conodont, Hindeodus parvus , was reported from a thin gray siliceous claystone bed that is intercalated approximately 10 cm above the base of black shale at Ubara section in Southwest Japan (Yamakita et al . 1999) and 80 cm above the base of black shale at Akkamori section in Northeast Japan (Takahashi et al .…”

Section: Introductionmentioning

confidence: 99%

“… Schematic composite column of the pelagic sequence from the Late Permian to Middle Triassic in Japan (Isozaki 1997) and fragmental sequences in Ubara (Kuwahara et al . 1991; Yamakita et al . 1999), Kinkazan (Sugiyama 1992), Gujo‐hachiman (Kuwahara et al .…”

Section: Introductionmentioning

confidence: 99%

High‐resolution lithostratigraphy and organic carbon isotope stratigraphy of the Lower Triassic pelagic sequence in central Japan

Sakuma¹,

Tada²,

Ikeda³

et al. 2012

Island Arc

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After the severest mass extinction event in the Phanerozoic, biotic recovery from the extinction at the Permian–Triassic boundary required approximately 5 my, which covers the entire Early Triassic. It is important to obtain information on the superocean Panthalassa, which occupied most of the world ocean, to explore paleoenvironmental changes during the Early Triassic at the global scale. In order to establish the continuous lithostratigraphy of pelagic sediments in Panthalassa during the Early Triassic, high‐resolution reconstruction of the Lower Triassic pelagic sequence in Japan was conducted for the first time based on detailed field mapping and lithostratigraphic correlation in the Inuyama area, central Japan. The reconstructed Early Triassic sequence is approximately 9.5 m thick, consists of five rock types, and is divided into eight lithological units. For the reconstructed continuous sequence, measurement of carbon isotopic composition of sedimentary organic matter (δ13Corg) was carried out. Stratigraphic variation of the δ13Corg value shows large‐amplitude fluctuations between −34.4 and −21.0‰ throughout the sequence. In order to establish a higher resolution age model for the reconstructed Lower Triassic pelagic sequence, we correlated δ13Corg records in the Inuyama area with high‐resolution isotopic profiles of carbonate carbon (δ13Ccarb) from shallow‐marine carbonate sequences in southern China based on the similarity in general variation patterns with age constraints by radiolarian and conodont biostratigraphy. The result provides a high‐resolution time scale for the pelagic sequence of Panthalassa during the Smithian and Spathian. The age model suggests a drastic increase in sedimentation rate during the late Smithian, which should have been caused by the increase in terrigenous input to this site.

show abstract

Confirmation of the Permian/Triassic boundary in deep-sea sedimentary rocks; earliest Triassic condonts from black carbonaceous claystone of the Ubara section in the Tamba Belt, Southwest Japan.

Cited by 37 publications

References 8 publications

Extent, duration, and nature of the Permian-Triassic superanoxic event

Extent, duration, and nature of the Permian-Triassic superanoxic event

Changes in depth-transect redox conditions spanning the end-Permian mass extinction and their impact on the marine extinction: Evidence from biomarkers and sulfur isotopes

High‐resolution lithostratigraphy and organic carbon isotope stratigraphy of the Lower Triassic pelagic sequence in central Japan

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