X-ray imagery and physical core logging as a proxy of the content of sediment cores in cold-water coral mound provinces: a case study from Porcupine Seabight, SW of Ireland

Issue Title: Carbonate Mounds on the NW European Margin: A window into Earth History Three provinces, characterized by the presence of carbonate mounds interpreted as cold-water coral banks have been reported in Porcupine Seabight, SW of Ireland and were recently subjected to many detailed studies....

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2007-02, Vol.96 (1), p.141-158
Main Authors: Foubert, A., Van Rooij, D., Blamart, D., Henriet, J.-P.
Format: Article
Language:English
Subjects:
Continental interfaces, environment
Core logging
Cores
Mounds
Ocean, Atmosphere
Physical properties
Provinces
Sciences of the Universe
Wave velocity
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Summary:Issue Title: Carbonate Mounds on the NW European Margin: A window into Earth History Three provinces, characterized by the presence of carbonate mounds interpreted as cold-water coral banks have been reported in Porcupine Seabight, SW of Ireland and were recently subjected to many detailed studies. This contribution discusses the use of X-ray imagery and physical properties in deciphering palaeoceanographic, sedimentological and biological processes. Physical property core logging and X-ray imagery are used to identify and describe sedimentation regimes and so their respective palaeoceanographic and palaeoclimatological settings in two mound provinces, respectively the Belgica mound province and the Magellan mound province. Both provinces show at present time clear differences in the hydrodynamic environment. This study confirms that also during the past the oceanographic and sedimentological environment of both provinces differ clearly. Impacts of glacial-interglacial variations and locally derived ice rafting events (IRE), comparable with the North Atlantic Heinrich events (HE) have been recognized in both provinces. Moreover, the combination of X-ray imagery, magnetic susceptibility, gamma density and P-wave velocity makes it possible to estimate the coral content and coral distribution in unopened cores localized on top of carbonate mounds. A comparison between on-mound and off-mound cores in both provinces allowed revealing some mechanisms of mound evolution and coral growth versus time.[PUBLICATION ABSTRACT]
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-006-0087-5