Cyclostratigraphic examination of Middle Triassic (Anisian) bedded chert in the Chichibu Belt from Tsukumi area, eastern Kyushu, Japan

Soda, Katsuhito; Onoue, Tetsuji; Ikeda, Masayuki

doi:10.5575/geosoc.2015.0008

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…This could be because the BSi burial flux and the relative amplitudes of orbitally induced cycles in the Kamuikotan section are lower than those of the Inuyama section 21 ( Figs 1 and 3 ). Nevertheless, the overall in-phase relations of Myr-scale cycles with similar amplitudes between Inuyama and Tsukumi sections 22 , deposited near the equator, support the idea that the BSi burial flux of the Inuyama bedded chert was representative of the overall Myr-scale BSi burial flux in the equatorial region ( Fig. 3 and Supplementary Note 3 ).…”

Section: Discussionsupporting

confidence: 53%

Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts

2017

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The global silica cycle is an important component of the long-term climate system, yet its controlling factors are largely uncertain due to poorly constrained proxy records. Here we present a ∼70 Myr-long record of early Mesozoic biogenic silica (BSi) flux from radiolarian chert in Japan. Average low-mid-latitude BSi burial flux in the superocean Panthalassa is ∼90% of that of the modern global ocean and relative amplitude varied by ∼20–50% over the 100 kyr to 30 Myr orbital cycles during the early Mesozoic. We hypothesize that BSi in chert was a major sink for oceanic dissolved silica (DSi), with fluctuations proportional to DSi input from chemical weathering on timescales longer than the residence time of DSi (<∼100 Kyr). Chemical weathering rates estimated by the GEOCARBSULFvolc model support these hypotheses, excluding the volcanism-driven oceanic anoxic events of the Early-Middle Triassic and Toarcian that exceed model limits. We propose that the Mega monsoon of the supercontinent Pangea nonlinearly amplified the orbitally paced chemical weathering that drove BSi burial during the early Mesozoic greenhouse world.

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Section: Discussionsupporting

confidence: 53%

Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts

2017

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“…Red, orange, and blue lines in the REDFIT spectra delineate 99%, 95%, and 90% confidence levels (CL) against red-noise background from a first-order autoregressive process, respectively (Schulz and Mudelsee 2002). P and SP at the spectral peaks represent precession and semi-precession (Berger et al 2006;Soda et al 2015), respectively. Black contours and shaded regions in the wavelet spectra indicate 95% CL against the red noise and cone of influence due to zero padding, respectively (Torrence and Compo 1998) pre-MEE declines of latest Permian radiolarians and ammonoids were related to an extraterrestrial event indicated by the 3 He record in the deep-sea PTB section of Japan.…”

Section: Discussionmentioning

confidence: 99%

Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary

Onoue

Takahata

Miura

et al. 2019

Prog Earth Planet Sci

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The ca 252 Ma Permian-Triassic boundary (PTB) represents the most severe mass extinction event of the Phanerozoic, with the disappearance of~80% of marine invertebrate species. Large-scale eruption of the Siberian Traps is the commonly favored cause, although the link between volcanism and extinction remains debated. Here, we report evidence for an extraterrestrial 3 He influx in the PTB section of deep-sea bedded cherts from Japan. This unusual signal indicates a significant increase in the influx of interplanetary dust particles, likely related to an asteroid shower in the inner solar system. High-resolution stratigraphy indicates that the peak flux of dust particles occurred during the final 500 kyr of the Permian, concurrent with a pre-extinction decline in radiolarian diversity.

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“…For both the Ajiro Island and Kurusu sections, geological maps of the outcrop were made based on examination of the geological structure and lithology at the sub-metre scale. For the major part of the Ajiro Island section, detailed lithostratigraphy has been reported by Onoue et al (2011), Soda et al (2015 and Uno et al (2012). We conducted a biostratigraphic investigation building on the lithostratigraphic section constructed by these studies.…”

Section: Field Mappingmentioning

confidence: 99%

“…Two sections were selected for investigation of conodont biostratigraphy in this study. The first is the Ajiro Island section in the Tsukumi area, southwest Japan (Onoue et al, 2011;Soda et al, 2015;Uno et al, 2012) (Figs. 1B, 2).…”

Section: Introductionmentioning

confidence: 99%

“…Although the stratotype of the radiolarian biozones of Sugiyama (1997) was defined in the Inuyama area, the stratotype sections of the TR 2A to TR 3A Zones were defined in separate outcrops, which is a large disadvantage to the Ajiro Island section. In addition, the Ajiro Island section was logged bed-by-bed in Onoue et al (2011) and Soda et al (2015). Radiolarian biostratigraphy was based on their logs, which meant that we could compare conodont and radiolarian biostratigraphy at bed-by-bed resolutions.…”

Section: Introductionmentioning

confidence: 99%

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Conodont-based age calibration of the Middle Triassic Anisian radiolarian biozones in pelagic deep-sea bedded chert

Muto

Takahashi

Yamakita

et al. 2019

Bull. Geol. Surv. Japan

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The age of pelagic Panthalassic deep-sea bedded chert has been assigned based on radiolarian biostratigraphy. However, Triassic radiolarian biostratigraphy is in many cases not precisely correlated to the conodont zones and the standard geological timescale. In this study, we investigated the conodont biostratigraphy of two radiolarian-controlled bedded chert sections of Anisian age: the Ajiro Island section in Oita Prefecture and the Kurusu section in Aichi Prefecture. We recognised six conodont biozones in the studied sections: the upper Olenekian Novispathodus brevissimus-Icriospathodus collinsoni and Triassospathodus homeri Zones, the lower Anisian Chiosella timorensis Zone, the middle Anisian Paragondolella bulgarica Zone, the upper Anisian Paragondolella excelsa Zone and the uppermost Anisian to lowermost Ladinian Paragondolella trammeri Zone. These conodont zones were successfully correlated to the standard Triassic radiolarian zonation proposed by Sugiyama (1997, Bull. Mizunami

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Cyclostratigraphic examination of Middle Triassic (Anisian) bedded chert in the Chichibu Belt from Tsukumi area, eastern Kyushu, Japan

Cited by 7 publications

References 17 publications

Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts

Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts

Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary

Conodont-based age calibration of the Middle Triassic Anisian radiolarian biozones in pelagic deep-sea bedded chert

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