Geochemistry of the late Cenomanian-early Turonian chalks of the Paris Basin: Manganese and carbon isotopes in carbonates as paleooceanographic indicators

Pomerol, B.

doi:10.1016/0195-6671(83)90025-3

Cited by 40 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Earlier studies have shown that marine manganese and iron ores were formed at times of peculiar paleoceanographic conditions. "Mn giants" of the early Toarcian, late Jurassic, Aptian, Albian, Cenomanian/Turonian boundary, and Miocene are correlated with ocean-wide anoxia (Oceanic Anoxic Events) and/or changes in the carbon cycle as expressed by positive δ 13 C excursions (e.g., Pomerol 1983;Frakes & Bolton 1984, 1992Schlanger et al 1987;Van Houten & Arthur 1989;Jenkyns et al 1991Jenkyns et al , 2002Pratt et al 1991;Corbin et al 2000;De Rafélis et al 2001). …”

Section: Introductionmentioning

confidence: 99%

Altered carbon cycling and trace-metal enrichment during the late Valanginian and early Hauterivian

Kuhn¹,

Weissert

Föllmi

et al. 2005

Eclogae geol. Helv.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Altered carbon cycling and trace-metal enrichment during the late Valanginian and early Hauterivian

Kuhn¹,

Weissert

Föllmi

et al. 2005

Eclogae geol. Helv.

View full text Add to dashboard Cite

“…The occurrence of the CTBE in widely separate localities from which large collections of isotopic data are available (Scholle and Arthur 1980;Pomerol, 1983;Pratt and Threlkeld, 1984;Hilbrecht and Hoefs, 1986;Schlanger et al, 1987) provides an ex cellent opportunity to document a global isotopic event. World wide changes in 5 13 C reflect alternations in the carbon cycle.…”

Section: Resultsmentioning

confidence: 99%

“…Section data: Pueblo (Pratt and Threlkeld, 1984;Leckie, 1985), Tarfaya (Thurow, unpubl. data; biostratigraphy from Kuhnt et al, 1986), Pays de Caux (Pomerol, 1983), Humberside biostratigraphy from Hart and Bigg, 1981). dissolved in 0.75 N HC1 and made up to a final volume of 100 mL) when only a small quantity of the sample was available.…”

Section: Inorganic Geochemistrymentioning

confidence: 99%

The Cenomanian/Turonian Boundary Event (CTBE) at Hole 641A, ODP Leg 103 (Compared with the CTBE Interval at Site 398)

Thurow¹,

Moullade²,

Brumsack³

et al. 1988

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

Drilling at ODP Site 641 (on the western margin of Galicia Bank, off northwestern Spain) revealed a thin, but pro nounced, interval of black shale and gray-green claystone. Our high-resolution study combines the sedimentology, micropaleontology (palynomorphs and others), organic and inorganic geochemistry, and isotopic values of this layer to demonstrate the distinct nature of the sediment and prove that the sequence represents the local sedimentary expression of the global Cenomanian/Turonian Oceanic Anoxic Event (OAE) of Schlanger and Jenkyns (1976), Jenkyns (1980), also called the Cenomanian/Turonian Boundary Event (CTBE).The most striking evidence is that the strong positive 5 13 C excursion characterizing the CTBE sequences in shallow areas can be traced into a pronounced deep-sea expression, thus providing a good stratigraphic marker for the CTBE in various paleosettings. The isotopic excursion at Site 641 coincides with an extremely enriched trace metal content, with values that were previously unknown for the Cretaceous Atlantic. Similar to other CTBE occurrences, the organic car bon content is high (up to 11%) and the organic matter is of dominantly marine origin (kerogen type II).The bulk mineralogy of the CTBE sediments does not differ significantly from the general trend of Cretaceous North Atlantic sediments (dominance of smectite and zeolite with minor amounts of illite and scattered palygorskite, kaolinite, and chlorite); thus, no evidence for either increased volcanic activity nor a drastic climatic change in the bor derlands was found.Results from Site 641 are compared with the CTBE section found at Site 398, DSDP Leg 47B (Vigo Seamount at the southern end of the Galicia Bank).

show abstract

“…Un pic maximum est observe au niveau du banc 5. Une telle constatation a deja ete soulignee par Pomerol [42], Pomerol et Mortimore [43].…”

Section: Le Bassin Anglo-parisienunclassified

Interactions climat-eustatisme-tectonique. Les enseignements et perspectives du Crétacé supérieur (Cénomanien-Coniacien)

Malartre¹,

Ferry²,

Rubino³

1998

Geodinamica Acta

View full text Add to dashboard Cite

Geochemistry of the late Cenomanian-early Turonian chalks of the Paris Basin: Manganese and carbon isotopes in carbonates as paleooceanographic indicators

Cited by 40 publications

References 12 publications

Altered carbon cycling and trace-metal enrichment during the late Valanginian and early Hauterivian

Altered carbon cycling and trace-metal enrichment during the late Valanginian and early Hauterivian

The Cenomanian/Turonian Boundary Event (CTBE) at Hole 641A, ODP Leg 103 (Compared with the CTBE Interval at Site 398)

Interactions climat-eustatisme-tectonique. Les enseignements et perspectives du Crétacé supérieur (Cénomanien-Coniacien)

Contact Info

Product

Resources

About