Ocean-wide stagnation episodes in the Late Cretaceous

Graciansky, P. C. de; Deroo, G.; Herbin, J. P.; Jacquin, Thierry; Magniez, F.; Montadert, L.; Müller, Carla; Ponsot, C.; Silva, André; Sigal, Jacques

doi:10.1007/bf01770176

Cited by 32 publications

(5 citation statements)

References 30 publications

(15 reference statements)

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“…Discussion on the formation of organic‐rich sediments has attracted the attention of numerous authors over the years (Schlanger & Jenkyns, 1976; Parrish, 1982; Southam et al ., 1982; Graciansky et al ., 1984; Jenkyns & Clayton, 1986; Arthur et al ., 1987; Weissert, 1989; Pedersen & Calvert, 1990; Joachimski & Buggisch, 1993; Föllmi et al ., 1994). These authors suggested a number of models for the globally synchronous organic‐carbon deposition in the world oceans, for example during the Late Frasnian, Toarcian, Early Aptian, Late Aptian and Cenomanian/Turonian.…”

Section: Discussionmentioning

confidence: 99%

Carbon‐isotope stratigraphy in shallow‐water carbonates: implications for Cretaceous black‐shale deposition

1998

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A Barremian to Albian succession on Mount Kanala, part of a Tethyan isolated carbonate platform, was investigated for its δ13C variations. The limestone sequence is composed of a series of peritidal shallowing‐upward cycles with clear petrographic evidence for strong early diagenetic overprinting related to repeated subaerial exposure. Despite significant impact of diagenesis, the observed changes in δ13C can be very well correlated with deep‐water sections from different ocean basins and shallow water carbonate platforms in the Middle East. This lends further support to the applicability of δ13C variations for stratigraphic purposes in shallow‐water limestones. Using the δ13C signal, time resolution in Lower Cretaceous platform carbonates can be significantly increased, independent of bio‐zonations often hampered by ecological variability. Cyclostratigraphic analysis of the Aptian part of the section shows that strong positive excursions of the cumulative departure from mean cycle thickness of the peritidal shallowing‐upward cycles coincide with global positive δ13C excursions. This, and the fact that positive shifts in the δ13C record are preserved within shallow water limestones, provide evidence that black‐shale accumulation in the ocean basins occurred during sea‐level rise and flooding of platform tops. Integration of carbon‐isotope‐, cyclo‐ and sequence‐stratigraphic results from different carbonate platforms indicate that strong positive global δ13C shifts and concurrent organic‐carbon burial during black‐shale deposition are ultimately caused by rapid rises of eustatic sea level. Hence, the rate of change of eustatic sea level is considered to play a crucial role in black‐shale accumulation in the global ocean basins during the Cretaceous.

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Section: Discussionmentioning

confidence: 99%

Carbon‐isotope stratigraphy in shallow‐water carbonates: implications for Cretaceous black‐shale deposition

1998

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“…As a consequence of enhanced atmospheric CO 2 , the mean temperature was presumably 6-148C higher than today (Barron, 1982;Arthur et al, 1985;Barron and Washington, 1985;Herbert and Fischer, 1986). It has been suggested that, due to equable climate, the oceans were characterized by bsluggishQ water circulation (Bralower and Thierstein, 1984;de Graciansky et al, 1984). In the absence of significant ice and with an ocean basin configuration different than at present, bottom, deep, and/or intermediate water masses may have become the major bottom water source (Arthur and Natland, 1979;Brass et al, 1982;Wilde and Berry, 1982).…”

Section: Palaeoceanographic Conditions During the Bonarelli Level Dep...mentioning

confidence: 99%

Comparative high-resolution chemostratigraphy of the Bonarelli Level from the reference Bottaccione section (Umbria–Marche Apennines) and from an equivalent section in NW Sicily: Consistent and contrasting responses to the OAE2

Scopelliti¹,

Bellanca²,

Neri³

et al. 2006

Chemical Geology

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“…no carbonate (de Graciansky et al 1986b). It is thought to have been deposited at a depth of c. 1300 m (de Graciansky et al 1986a). Only one sample of the black shale was analysed; free maleimides were recovered with the Me,Et component being most abundant, the Me,Me and Me,H components being present in subordinate abundances, and the Me,i-Pr, Et,Et, Me,n-Pr, Me,i-Bu and Me,n-Bu components occurring as very minor components.…”

Section: The Toarcian Oaementioning

confidence: 99%

Further evidence for the development of photic-zone euxinic conditions during Mesozoic oceanic anoxic events

Pancost

Crawford

Magness

et al. 2004

JGS

195

116

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Periods in Earth history characterized by extensive organic carbon deposition, so-called oceanic anoxic events (OAEs), are the subject of considerable scrutiny. Insight into the extent of anoxic conditions in the water column has been provided by the reported occurrence of derivatives of isorenieratene, a carotenoid found only in green sulphur bacteria and thus indicative of photic-zone euxinia (i.e. a water column containing free H 2 S), in North Atlantic deep-sea sediments deposited during the Cenomanian-Turonian boundary OAE2 (Bonarelli Event). In this study, we have used the distributions of chlorophyll and bacteriochlorophyll degradation products, maleimides (1-H-pyrrole-2,5-diones) and high molecular weight porphyrins, to examine further the Cenomanian-Turonian boundary OAE2 as well as other OAEs of the early Toarcian (Posidonienschiefer Event) and early Aptian (Selli Event). In particular, methyl isobutyl (Me,i-Bu) maleimide, on structural grounds, appears to be diagnostic of green sulphur bacteria. This compound occurs in five of seven examined marls that record the early Toarcian OAE (Marche-Umbria, Italy), further expanding the geographical range of Toarcian sediments where evidence for photic-zone euxinic conditions has been found. Me,i-Bu maleimide occurs in three of six black shales spanning the Livello Selli (Marche-Umbria, Italy), the type locality for the Aptian OAE1a, providing the first evidence for photic-zone euxinic conditions during this event. With respect to the Cenomanian-Turonian OAE, maleimide evidence for photic-zone euxinic conditions was found in all the North Atlantic sites investigated, including those characterized by relatively organic-lean sediments, several Tethyan sites and one site off western Australia. These data indicate that euxinic conditions were common in the water column during Mesozoic oceanic anoxic events.

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Ocean-wide stagnation episodes in the Late Cretaceous

Cited by 32 publications

References 30 publications

Carbon‐isotope stratigraphy in shallow‐water carbonates: implications for Cretaceous black‐shale deposition

Carbon‐isotope stratigraphy in shallow‐water carbonates: implications for Cretaceous black‐shale deposition

Comparative high-resolution chemostratigraphy of the Bonarelli Level from the reference Bottaccione section (Umbria–Marche Apennines) and from an equivalent section in NW Sicily: Consistent and contrasting responses to the OAE2

Further evidence for the development of photic-zone euxinic conditions during Mesozoic oceanic anoxic events

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