Strontium, Manganese, and Iron Contents, and Oxygen Isotopes in the Carbonate Fractions Recovered from Hole 398C, Leg 47B

Renard, Maurice; Richebois, G.; Lètolle, René

doi:10.2973/dsdp.proc.47-2.116.1979

Cited by 2 publications

(4 citation statements)

References 1 publication

(3 reference statements)

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“…6). This relationship has been observed in sediments of the same age from Holes 398D (Vigo Seamount, DSDP Leg 47B; Renard et al, 1979a) and 400A (northern Bay of Biscay, DSDP Leg 48; Renard et al, 1979b). In Hole 63 8B, most of the samples are influenced by the continental supply (Fig.…”

Section: Trace Elementssupporting

confidence: 63%

“…Because burial diagenesis leads to a loss in Sr (Veizer, 1977(Veizer, , 1983Baker et al, 1982;Renard, 1979;Renard et al, 1979aRenard et al, , 1979b, the generally positive downhole trend in Sr content observed at Hole 641C clearly shows that Sr concentrations at this hole are not controlled mainly by diagenesis. This suggests that the Sr content of pelagic carbonate reflects, at least partially, seawater Sr/Ca fluctuations.…”

Section: Trace Elementsmentioning

confidence: 99%

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Variations in Trace Element Contents and Isotopic Compositions of Lower Cretaceous Carbonates from the Galicia Margin (ODP Leg 103): Reconstruction of the Paleochemistry of the Early Cretaceous Ocean

Clauser¹,

Renard²,

Richebois³

1988

Proceedings of the Ocean Drilling Program

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Trace element contents (Sr, Mg, Mn, and Fe) and the composition of oxygen and carbon isotopes show that late burial diagenesis did not play an important role in pelagic carbonate chemistry in the bulk carbonates recovered from Holes 638B, 638C, and 641C (except for anoxic pore-water diagenesis in Valanginian sediments). The evolution of these different geochemical markers documents the importance and global extent of the Barremian ocean chemistry crisis. A reconstruction of paleoceanographic and climatic conditions during the Early Cretaceous is proposed. Sea level rose eustatically from the early Hauterivian to early Albian, but a rapid down and up fluctuation occurred during the Barremian. Soluble supply from the continent decreased during the Valanginian-early Hauterivian while oceanic hydrothermal supply increased. The climate cooled slightly during the Hauterivian, rapidly warmed during the Barremian, and cooled again during the Aptian.

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Section: Trace Elementssupporting

confidence: 63%

Section: Trace Elementsmentioning

confidence: 99%

Variations in Trace Element Contents and Isotopic Compositions of Lower Cretaceous Carbonates from the Galicia Margin (ODP Leg 103): Reconstruction of the Paleochemistry of the Early Cretaceous Ocean

Clauser¹,

Renard²,

Richebois³

1988

Proceedings of the Ocean Drilling Program

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“…Although the drilling recovery is not complete, organic matter enrichments were recorded in the Atlantic Ocean in the Upper Hauterivian marly-limestone deposits of Moroccan (DSDP site 370) and Iberian margins (DSDP site 398). These black shales are also related to a minor positive carbon-isotope excursion [3,52].…”

Section: Other Possible Records Of the Faraoni Eventmentioning

confidence: 99%

“…En revanche, des équivalents du niveau Faraoni ont été décrits en Lombardie [12] et en Sicile [11]. Dans les sites DSDP de l'Atlantique, seules les données micropaléontologiques (nannofossiles calcaires) et géochimiques (organique et isotopiques) permettent de suspecter la présence de conditions anoxiques vers la fin de l'Hauterivien [3,52]. Dans les bassins septentrionaux d'Allemagne, un enrichissement en matière or-ganique est noté dans les séries de plate-forme au niveau de la zone à Simbirskites discofalcatus, équivalent de la zone à P. angulicostata [51].…”

Section: Autres Enregistrements Possibles De Cet éVénement (Fig 4)unclassified

A Late Hauterivian short-lived anoxic event in the Mediterranean Tethys: the ‘Faraoni Event’

Baudin

2005

Comptes Rendus. Géoscience

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A Late Hauterivian interval (∼127.5 Ma), called the 'Faraoni Event', which is characterised by the deposition of deep-marine black shales in the Mediterranean Tethys, is demonstrably of sufficient geological brevity to be qualified as an anoxic event. This event lies within the Pseudothurmannia catulloi ammonite subzone, coincides with the extinction of the calcareous nannofossil species Lithraphidites bollii, and records an increase in a globular planktonic foraminifer. High quantities of marine organic matter were preserved in pelagic successions from northern and central Italy, Switzerland, southeastern France, southern Spain and probably elsewhere in the Mediterranean Tethys and Atlantic Ocean. Carbon-isotope stratigraphy from Tethyan and Atlantic sections shows a minor positive excursion in the uppermost part of the Hauterivian and Lowermost Barremian, suggesting accelerated extraction of organic carbon from the ocean reservoir just after the 'Faraoni Event'. The duration of this short event is less than 100 ka according to cyclostratigraphy and coincides with a third-order sea-level rise. It is likely that similar forcing mechanisms responsible for global OAEs operated during this short time interval.

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Strontium, Manganese, and Iron Contents, and Oxygen Isotopes in the Carbonate Fractions Recovered from Hole 398C, Leg 47B

Cited by 2 publications

References 1 publication

Variations in Trace Element Contents and Isotopic Compositions of Lower Cretaceous Carbonates from the Galicia Margin (ODP Leg 103): Reconstruction of the Paleochemistry of the Early Cretaceous Ocean

Variations in Trace Element Contents and Isotopic Compositions of Lower Cretaceous Carbonates from the Galicia Margin (ODP Leg 103): Reconstruction of the Paleochemistry of the Early Cretaceous Ocean

A Late Hauterivian short-lived anoxic event in the Mediterranean Tethys: the ‘Faraoni Event’

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