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Camoin, G; Cabioch, G; Eisenhauer, A; Braga, J; Hamelin, B; Lericolais, Gilles. |
In situ microbialites occurring in reef rocks dredged between 80 and 130 in water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 2900 to 4410 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise. Microbialites developed in both shallow and deep water depositional environments where they characterize various zones of the reef tracts (reef crests, upper reef slopes, deep fore-reef slopes), reflecting contrasting scenarios of microbialite development involving ''reefal microbialites'' in shallow-water settings and ''slope microbialites'' that formed in environments deeper than 1020 in and extending down to more than 100 m. Reefal microbialites... |
Tipo: Text |
Palavras-chave: Sea level changes; Nutrients; French polynesia; Holocene; Last deglaciation; Microbialites; Coral reefs. |
Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-4204.pdf |
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Cabioch, G; Correge, T; Turpin, L; Castellaro, C; Recy, J. |
In New Caledonia, core data indicate that the fringing reefs grew during the last interglacial and the Holocene, while the barrier reefs developed during several high sea level stands of the Quaternary. These growth periods are archived in a 128-m-long core from Ilot Amedee, offshore of Noumea. Directly upon the peridotitic substrate (reached at 126.50 m), a basal unit comprising abundant rhodoliths, molluscs and rare corals is characteristic of the pioneer stage of barrier reef development. Above it, a severely calcitized unit contains corals, molluscs and abundant micritic levels. Then, a sequence punctuated by several minor discontinuities and by a downward increase in diagenetic alteration is found. At 47 m core depth, a unit, which is thought to be... |
Tipo: Text |
Palavras-chave: Croissance récifale; Néotectonique; Nouvelle-Calédonie; Quaternaire; Reef growth; Neotectonics; New Caledonia; Quaternary. |
Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43582/44021.pdf |
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