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| Penaud, Aurelie; Eynaud, F.; Voelker, A.; Kageyama, M.; Marret, F.; Turon, J. L.; Blamart, D.; Mulder, T.; Rossignol, L.. |
| New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regimes in the subtropical NE Atlantic Ocean over the last 30 ka. Our results have revealed highest upwelling intensity during Heinrich Stadial 1 (HS 1) and the Younger Dryas and weaker upwelling cells during the Last Glacial Maximum (LGM) and HS 2, off the SW Iberian and NW Moroccan margins. Similar assemblages between the Gulf of Cadiz and the NW Moroccan margin, and distinct species off Portugal, were observed during the cold climatic extremes that punctuated the last 30 ka. This... |
| Tipo: Text |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00230/34125/32598.pdf |
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| Van Rooij, D.; Blamart, D.; Richter, T.; Wheeler, A.; Kozachenko, M.; Henriet, J.-p.. |
| The Belgica cold-water coral banks on the eastern slope of the Porcupine Seabight are closely associated with bottom currents. In order to better understand the local temporal and spatial characteristics, as well as the palaeoclimatologic influences, a 26 m long core, taken on a small contourite drift, was studied. This sediment record of approximately 100 ka BP reveals new insights into the regional glacial and sedimentary processes, which are intrinsically linked to several geological, climatological, biological and hydrodynamic variables. The glacial sequences in the core contain six ice-rafting events (IRE). They are comparable with the North Atlantic Heinrich Events, although their characteristics show dominant influences from the proximal... |
| Tipo: Text |
Palavras-chave: Contourite; Ice-rafting event; British-Irish ice sheet; Porcupine Basin; Coral banks. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00233/34438/32929.pdf |
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| Van Rooij, D.; Huvenne, V. A. I.; Blamart, D.; Henriet, J.-p.; Wheeler, A.; De Haas, H.. |
| The genesis and evolution of cold-water coral banks along the Northeastern Atlantic margin is known to be influenced by several factors, among which the palaeotopography and nature of the coral settling surface, the presence of bottom currents and sediment supply. In this paper, a case study is presented of the Enya mound cluster, located in the southernmost tip of the Belgica mound province, west of Ireland. Below this mound cluster, seismic stratigraphy revealed a yet unmapped local unconformity RD1b, being part of a composite erosion event (RD1). As such, from the Late Miocene to Late Pliocene, at least two erosional events have incised the margin, ending with the final RD1a "moundbase" unconformity, acting as a base for the Enya mounds. During the... |
| Tipo: Text |
Palavras-chave: Cold-water coral banks; Contourite drift; Pockmarks; Unconformity; Seismic stratigraphy. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00219/33075/31550.pdf |
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| Foubert, A.; Van Rooij, D.; Blamart, D.; Henriet, J.-p.. |
| 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... |
| Tipo: Text |
Palavras-chave: X-ray imagery; Physical core logging; Carbonate mounds; Porcupine Basin; Palaeoceanography. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00233/34451/32916.pdf |
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