| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Morphology and sedimentary architecture of a modern volcaniclastic turbidite system: The Cilaos fan, offshore La Reunion Island
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| Autores: |
Sisavath, Emmanuelle
Babonneau, Nathalie
Saint-ange, Francky
Bachelery, Patrick
Jorry, Stephan
Deplus, Christine
De Voogd, Beatrice
Savoye, Bruno
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| Data: |
2011-10
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| Ano: |
2011
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| Palavras-chave: |
Turbidite
Deep-sea fan
Volcaniclastic
La Reunion Island
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| Resumo: |
Recent oceanographic surveys revealed the existence of five volcaniclastic deep-sea fans off La Reunion Island. The Cilaos fan is a large volcaniclastic submarine fan, connected to rivers that episodically experience torrential floods through a narrow and steep shelf-slope system. New piston cores presented in this study together with echosounder profiles give new insight into the evolution, of this extensive and sand-rich turbidite system. The Cilaos fan extends over 15,000 km(2) on an abyssal plain and is compartmentalized by topographic highs. Located southwest of the island, the sedimentary system consists of a canyon area and a deep sea fan divided into a proximal and a distal fan. The proximal fan is characterized by its wide extent and coarse-grained turbidites. The distal fan is characterized by elongated structures and fine-grained turbidites. A detailed morphological study of the fan which includes the analysis of swath bathymetry, backscatter, echosounder, and piston core data shows that the Cilaos fan is a complex volcaniclastic deep-sea fan, highly influenced by preexisting seafloor irregularities. The canyons and the slope area show a complex and evolving sediment feeding system with a direct sediment input by the river and irregular sediment supply by submarine landslide. Three main construction stages are identified for this system: (1) an old incision phase of the channels forming wide turbidites extending over the entire distal fan; (2) a period of no or low activity characterized by a thick layer of hemipelagic mud; and (3) a local reactivation of the channel in the proximal fan. Each stage seems to be linked to a different sediment source with a progressively increasing contribution of hemipelagic sediment and mud in younger stages. (C) 2011 Elsevier B.V. All rights reserved.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00056/16704/14203.pdf
DOI:10.1016/j.margeo.2011.06.011
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| Editor: |
Elsevier Science Bv
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| Relação: |
http://archimer.ifremer.fr/doc/00056/16704/
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| Formato: |
application/pdf
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| Fonte: |
Marine Geology (0025-3227) (Elsevier Science Bv), 2011-10 , Vol. 288 , N. 1-4 , P. 1-17
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| Direitos: |
2011 Elsevier B.V. All rights reserved.
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