Early Toarcian (Early Jurassic) oceanic anoxic event recorded in the shelf deposits in the northwestern Panthalassa: Evidence from the Nishinakayama Formation in the Toyora area, west Japan

Izumi, Kiyotaka; Miyaji, Tsuzumi; Tanabe, Kazushige

doi:10.1016/j.palaeo.2011.11.016

Cited by 85 publications

(77 citation statements)

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“…Recent spectral analyses of expanded sections in Morocco suggest slightly lower duration for the Pl-To event (∼400 kyrs; Krencker et al, 2013). These negative CIEs, first interpreted as consequences of diagenetic processes or regional upwellings of 13 C-depleted water masses (Küspert, 1982;Jenkyns, 1988), have been also evidenced in fossil wood (Hesselbo et al, 2000(Hesselbo et al, , 2007Al-Suwaidi et al, 2010;Caruthers et al, 2011), suggesting a substantial input of 13 Cdepleted carbon into the atmosphere-ocean system.…”

Section: Introductionmentioning

confidence: 95%

“…Generalized carbonate production crisis also took place during these two events and were characterized by a drastic size reduction of the main pelagic carbonate producer Schizosphaerella (Mattioli and Pittet, 2002;Suan et al, 2008a), near disappearance of shallow-water platforms (Dromart et al, 1996;Trecalli et al, 2012) and decrease in carbonate accumulation in basinal succession (Mattioli et al, 2004. Importantly, marine carbonates and organic carbon from several sites around the world record pronounced (∼2-5h) negative carbon isotope excursions (CIE) at the Pl-To and T-OAE (Hesselbo et al, 2000;Jenkyns et al, 2001;Kemp et al, 2005;Hesselbo et al, 2007;Littler et al, 2010;Al-Suwaidi et al, 2010;Caruthers et al, 2011;Suan et al, 2011;Izumi et al, 2012). The duration of the T-OAE negative CIE has been suggested to be in the order of ∼300 to 900 kyr (Kemp et al, 2005;Suan et al, 2008b;Huang and Hesselbo, 2013;Boulila et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…This time interval was punctuated by second-order global development of poor oxygenation in the oceans (Jenkyns, 1988(Jenkyns, , 2010. Generalized carbonate production crisis also took place during these two events and were characterized by a drastic size reduction of the main pelagic carbonate producer Schizosphaerella (Mattioli and Pittet, 2002;Suan et al, 2008a), near disappearance of shallow-water platforms (Dromart et al, 1996;Trecalli et al, 2012) and decrease in carbonate accumulation in basinal succession (Mattioli et al, 2004.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calcium isotope evidence for dramatic increase of continental weathering during the Toarcian oceanic anoxic event (Early Jurassic)

Brazier

Suan

Tacail

et al. 2015

Earth and Planetary Science Letters

110

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calcium isotope evidence for dramatic increase of continental weathering during the Toarcian oceanic anoxic event (Early Jurassic)

Brazier

Suan

Tacail

et al. 2015

Earth and Planetary Science Letters

110

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“…Evidence for widespread oceanic anoxia during the Early Toarcian (183 Ma) relies heavily on sedimentological observation of organic-rich rocks (Jenkyns, 1988). However, as the record of these organic carbon-rich deposits is geographically restricted to the European epicontinental sea, their global significance cannot be ascertained with confidence, although some sections outside Europe reflecting more open oceanic conditions do seem to hint at a coeval organic carbon enrichment (Hori, 1997;Al-Suwaidi et al, 2010;Caruthers et al, 2011;Gröcke et al, 2011;Izumi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…However, as the record of these organic carbon-rich deposits is geographically restricted to the European epicontinental sea, their global significance cannot be ascertained with confidence, although some sections outside Europe reflecting more open oceanic conditions do seem to hint at a coeval organic carbon enrichment (Hori, 1997;Al-Suwaidi et al, 2010;Caruthers et al, 2011;Gröcke et al, 2011;Izumi et al, 2012). Several definitions of black shales have been used by various authors, as pointed out by McArthur et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Black shale deposition during Toarcian super-greenhouse driven by sea level

2013

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Abstract. One of the most elusive aspects of the Toarcian oceanic anoxic event (T-OAE) is the paradox between carbon isotopes that indicate intense global primary productivity and organic carbon burial at a global scale, and the delayed expression of anoxia in Europe. During the earliest Toarcian, no black shales were deposited in the European epicontinental seaways, and most organic carbon enrichment of the sediments postdated the end of the overarching positive trend in the carbon isotopes that characterises the T-OAE. In the present study, we have attempted to establish a sequence stratigraphic framework for Early Toarcian deposits recovered from a core drilled in the Paris Basin using a combination of mineralogical (quartz and clay relative abundance) and geochemical (Si, Zr, Ti and Al) measurements. Combined with the evolution in redox sensitive elements (Fe, V and Mo), the data suggest that expression of anoxia was hampered in European epicontinental seas during most of the T-OAE (defined by the positive carbon isotope trend) due to insufficient water depth that prevented stratification of the water column. Only the first stratigraphic occurrence of black shales in Europe corresponds to the "global" event. This interval is characterised by > 10 % Total Organic Carbon (TOC) content that contains relatively low concentration of molybdenum compared to subsequent black shale horizons. Additionally, this first black shale occurrence is coeval with the record of the major negative Carbon Isotope Excursion (CIE), likely corresponding to a period of transient greenhouse intensification likely due to massive injection of carbon into the atmosphere-ocean system. As a response to enhanced weathering and riverine run-off, increased fresh water supply to the basin may have promoted the development of full anoxic conditions through haline stratification of the water column. In contrast, post T-OAE black shales during the serpentinum and bifrons Zones were restricted to epicontinental seas (higher Mo to TOC ratios) during a period of relative high sea level, and carbon isotopes returning to pre-T-OAE values. Comparing palaeoredox proxies with the inferred sequence stratigraphy for Sancerre suggests that episodes of short-term organic carbon enrichment were primarily driven by third-order sea level changes. These black shales exhibit remarkably well-expressed higher-frequency cyclicities in the oxygen availability in the water column whose nature has still to be determined through cyclostratigraphic analysis.

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Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Wang

Chen

et al. 2015

Geological Journal

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The early Jurassic black shales are the most important source rocks in the Qiangtang Basin, Tibet. These black shales may provide a useful example for understanding the sedimentary conditions during the early Jurassic in the eastern Tethys. Thirty-two black-shale samples were collected from the Qiangtang Basin to reconstruct the depositional environments during the early Jurassic in the eastern Tethys. The palaeoclimate index Σ(Fe + Mn + Cr + Ni + V + Co)/Σ(Ca + Mg + Sr + Ba + K + Na) varies between 0.58 and 1.14, together with low Sr/Ba (0.20-0.60) and Sr/Cu (1.68-7.88) ratios, indicating a warm humid to semi-humid climatic condition during black-shale deposition. The early Jurassic black shales exhibit slight Ce anomalies (0.89-0.94) and Mn enrichment (EF = 1.2), suggesting a slightly oxic depositional environment. The conditions of the sedimentary water system during black-shale deposition were apparently brackish as evidenced by middle B/Ga (3.96-5.73) and Th/U (3.96-6.51) ratios.

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Early Toarcian (Early Jurassic) oceanic anoxic event recorded in the shelf deposits in the northwestern Panthalassa: Evidence from the Nishinakayama Formation in the Toyora area, west Japan

Cited by 85 publications

References 49 publications

Calcium isotope evidence for dramatic increase of continental weathering during the Toarcian oceanic anoxic event (Early Jurassic)

Calcium isotope evidence for dramatic increase of continental weathering during the Toarcian oceanic anoxic event (Early Jurassic)

Black shale deposition during Toarcian super-greenhouse driven by sea level

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

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