Biochronostratigraphie des formations d'âge crétacé dans les forages du DSDP dans l'Océan Atlantique Nord. Première partie

Müller, Carla; Silva, André; Sigal, Jacques

doi:10.2516/ogst:1983042

Cited by 19 publications

(13 citation statements)

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“…The contact with overlying Unit C is sharp and underlined by a thin brownish layer (Pl. 2), which is interpreted as a sequence that is highly condensed or of almost zero sedimentation. This sharp boundary indicates that the depositional environment changed abruptly following the accumulation of Unit D (Event 2 of Muller et al, 1983Muller et al, , 1984. However, SEM studies revealed no significant change above this contact.…”

Section: Lithologies At Ctbe Intervals Site 641mentioning

confidence: 92%

“…At Site 398, R. rugosus was recovered from Samples 398D-56-2, 122 cm, to 398D-58-2, 80 cm. Its first appearance is in the uppermost Albian (Muller et al, 1983(Muller et al, , 1984. In European assemblages, this spe cies is rarely recognized.…”

Section: Age Assignment Of the Three Palynological Zonesmentioning

confidence: 99%

“…CTBE radiolarian associations have not been documented from the North Atlantic, although strata deposited during this event are widely recorded (Muller et al, 1983(Muller et al, , 1984Her bin et al, 1986b;Schlanger et al, 1987). Onshore, the dominance of biosiliceous faunas during this event has been recorded in Afri can coastal basins, as well as in the Alpine fold belts surround ing the western Mediterranean (Arthur and Premoli Silva, 1982;Thurow et al 1982;Kuhnt et al, 1986;Thurow and Kuhnt, 1986).…”

Section: Radiolariansmentioning

confidence: 99%

“…Fur thermore, the ready comparison of faunal results by Thurow et al (1982) with the macrofossil-and microfossil-bearing sections of the northwest African coastal basins (Wiedmann et al, 1978 has led to the development of a valuable standard. Con current with this work, de , and subse quently Muller et al (1983Muller et al ( , 1984, established their Evenement 2 (= Cenomanian/Turonian OAE of Schlanger and Jenkyns, 1976) to characterize a distinct layer in North Atlantic Creta ceous sequences. This layer is described as a laminated black claystone rich in marine organic matter and with a very low sed imentation rate, overlain by a multicolored claystone interval, and dated as Cenomanian and possibly basal Turonian.…”

Section: Introductionmentioning

confidence: 99%

“…6,Fig. 3; Evenement 2 of Muller et al, 1983Muller et al, , 1984. The middle and upper Cenomanian are condensed to a few centimeters (Pl.…”

Section: Introductionmentioning

confidence: 99%

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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

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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).

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Section: Lithologies At Ctbe Intervals Site 641mentioning

confidence: 92%

Section: Age Assignment Of the Three Palynological Zonesmentioning

confidence: 99%