| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Geomorphology and sedimentology of a modern isolated carbonate platform: The glorieuses archipelago, SW Indian Ocean
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| Autores: |
Prat, Sophie
Jorry, Stephan
Jouet, Gwenael
Camoin, Gilbert
Vella, Claude
Le Roy, Pascal
Caline, Bruno
Boichard, Robert
Pastol, Yves
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| Data: |
2016-10
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| Ano: |
2016
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| Palavras-chave: |
Carbonate platform
Modern coral reefs
Pleistocene fossil reefs
Sandwaves
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| Resumo: |
The study of modern carbonate systems is commonly helps in improving facies interpretation in fossil reefs and in providing analogues of sediment distribution depending on the specific platform configuration (i.e. rimmed shelves and isolated carbonate platforms). This paper deals with a geomorphological and sedimentological study of the Glorieuses Archipelago, an isolated carbonate platform located between the northern tip of Madagascar and Mayotte. The dataset consists of Digital Terrain Model, satellite imagery, and box-sediment samples. Analyses of grain-size and composition of carbonate grains are used to characterize the distribution and heterogeneity of sediment accumulated on the isolated platform. Main results show that the Glorieuses Archipelago is organized in distinctive morphological units, including a reef flat developed along the windward side, an apron, and a semi-enclosed (< 12 m water depth) to open lagoon (> 12 m and up to 15 m water depth). The lack of carbonate mud in sediments deposited on the archipelago can be explained by the direct connection between the lagoon and the open ocean. The main carbonate grains include Halimeda segments, coral fragments, large benthic foraminifers, red algae, and molluscs. According to the shape and the position of intertidal sandwaves, the current arrangement of moderately sorted fine to medium sands appears to be strongly influenced by tidal currents. The in-situ sediment production, accumulation and transport on the platform finally contribute to carbonate sand export to distinct deep marine areas depending on wind regimes and currents.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00326/43761/43318.pdf
DOI:10.1016/j.margeo.2016.04.009
http://archimer.ifremer.fr/doc/00326/43761/
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| Editor: |
Elsevier Science Bv
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| Formato: |
application/pdf
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| Fonte: |
Marine Geology (0025-3227) (Elsevier Science Bv), 2016-10 , Vol. 380 , P. 272-283
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| Direitos: |
2016 Elsevier B.V. All rights reserved.
info:eu-repo/semantics/openAccess
restricted use
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