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Preliminary results on Cretaceous-Tertiary tropical Atlantic pelagic sedimentation (Demerara Rise, ODP Leg 207)

Preliminary results on Cretaceous-Tertiary tropical Atlantic pelagic sedimentation (Demerara Rise, ODP Leg 207)
Preliminary results on Cretaceous-Tertiary tropical Atlantic pelagic sedimentation (Demerara Rise, ODP Leg 207)
Five sites located on a bathymetric transect of the distal Demerara Rise were studied by ODP Leg 207. Albian sediments of essentially terrigenous nature (clay, siltstone, sandstone) are the oldest drilled stratigraphic levels and form apparently the top of the synrift sequence. They are overlain by Cenomanian to Santonian finely laminated black shales, rich in organic matter of marine origin, which accumulated on a thermally subsiding ramp. Early Campanian hiatuses are thought to be the result of final disjunction of Demerara Rise (South America) from Africa and the onset of deep water communication between the two Atlantic basins (south and central). The overlying Uppermost Cretaceous–Oligocene chalk includes rich and diversified calcareous plankton assemblages, as well as two radiolarian-rich intervals (Late Campanian and Middle Eocene). A complex erosional surface developed during the Late Oligocene–Early Miocene. Sedimentation was impeded since then on the intermediate and deep sites of Demerara Rise, possibly due to the action of deep submarine currents.
Tropical Atlantic, Demerara, Cretaceous, Tertiary, black shales
1631-0713
609-616
Danelian, T.
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Le Callonnec, L.
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Erbacher, J.
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Mosher, D.C.
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Malone, M.C.
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Berti, D.
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Bice, K.L.
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Bostock, H.
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Brumsack, H.E.
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Forster, A.
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Heidersdorf, F.
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Henderiks, J.
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Janecek, T.J.
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Junium, C.
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MacLeod, K.
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Meyers, P.A.
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Mutterlose, J.H.
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Nishi, H.
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Norris, R.D.
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Ogg, J.G.
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O'Regan, M.A.
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Rea, B.
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Sexton, P.
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Sturt-Fredericks, H.
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Suganuma, Y.
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Thurow, J.W.
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Wilson, P.A.
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Wise, S.W.
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Glatz, C.
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Danelian, T.
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Le Callonnec, L.
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Erbacher, J.
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Mosher, D.C.
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Malone, M.C.
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Berti, D.
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Bice, K.L.
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Bostock, H.
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Brumsack, H.E.
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Forster, A.
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Heidersdorf, F.
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Henderiks, J.
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Janecek, T.J.
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Junium, C.
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MacLeod, K.
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Meyers, P.A.
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Mutterlose, J.H.
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Nishi, H.
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Norris, R.D.
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Ogg, J.G.
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O'Regan, M.A.
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Rea, B.
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Sexton, P.
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Sturt-Fredericks, H.
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Suganuma, Y.
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Thurow, J.W.
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Wilson, P.A.
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Wise, S.W.
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Glatz, C.
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Danelian, T., Le Callonnec, L., Erbacher, J., Mosher, D.C., Malone, M.C., Berti, D., Bice, K.L., Bostock, H., Brumsack, H.E., Forster, A., Heidersdorf, F., Henderiks, J., Janecek, T.J., Junium, C., MacLeod, K., Meyers, P.A., Mutterlose, J.H., Nishi, H., Norris, R.D., Ogg, J.G., O'Regan, M.A., Rea, B., Sexton, P., Sturt-Fredericks, H., Suganuma, Y., Thurow, J.W., Wilson, P.A., Wise, S.W. and Glatz, C. (2005) Preliminary results on Cretaceous-Tertiary tropical Atlantic pelagic sedimentation (Demerara Rise, ODP Leg 207). Comptes Rendus Geoscience, 337 (6), 609-616. (doi:10.1016/j.crte.2005.01.011).

Record type: Article

Abstract

Five sites located on a bathymetric transect of the distal Demerara Rise were studied by ODP Leg 207. Albian sediments of essentially terrigenous nature (clay, siltstone, sandstone) are the oldest drilled stratigraphic levels and form apparently the top of the synrift sequence. They are overlain by Cenomanian to Santonian finely laminated black shales, rich in organic matter of marine origin, which accumulated on a thermally subsiding ramp. Early Campanian hiatuses are thought to be the result of final disjunction of Demerara Rise (South America) from Africa and the onset of deep water communication between the two Atlantic basins (south and central). The overlying Uppermost Cretaceous–Oligocene chalk includes rich and diversified calcareous plankton assemblages, as well as two radiolarian-rich intervals (Late Campanian and Middle Eocene). A complex erosional surface developed during the Late Oligocene–Early Miocene. Sedimentation was impeded since then on the intermediate and deep sites of Demerara Rise, possibly due to the action of deep submarine currents.

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More information

Published date: 2005
Additional Information: In French, English abstract
Keywords: Tropical Atlantic, Demerara, Cretaceous, Tertiary, black shales

Identifiers

Local EPrints ID: 23989
URI: https://eprints.soton.ac.uk/id/eprint/23989
ISSN: 1631-0713
PURE UUID: 899c929d-a00b-47eb-9bcf-a656e2aed2a1

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Date deposited: 16 Mar 2006
Last modified: 15 Jul 2019 19:19

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Contributors

Author: T. Danelian
Author: L. Le Callonnec
Author: J. Erbacher
Author: D.C. Mosher
Author: M.C. Malone
Author: D. Berti
Author: K.L. Bice
Author: H. Bostock
Author: H.E. Brumsack
Author: A. Forster
Author: F. Heidersdorf
Author: J. Henderiks
Author: T.J. Janecek
Author: C. Junium
Author: K. MacLeod
Author: P.A. Meyers
Author: J.H. Mutterlose
Author: H. Nishi
Author: R.D. Norris
Author: J.G. Ogg
Author: M.A. O'Regan
Author: B. Rea
Author: P. Sexton
Author: H. Sturt-Fredericks
Author: Y. Suganuma
Author: J.W. Thurow
Author: P.A. Wilson
Author: S.W. Wise
Author: C. Glatz

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