Morphology and sediments of the fore-slopes of Mayotte, Comoro Islands: direct observations from a submersible.

Dullo, Wolf-Christian , Camoin, G. F., Blomeier, D., Colonna, M., Eisenhauer, Anton , Faure, G., Casanova, J. and Thomassin, B. A. (1998) Morphology and sediments of the fore-slopes of Mayotte, Comoro Islands: direct observations from a submersible. In: Reefs and Carbonate Platforms in the Pacific and Indian Oceans Reefs and Carbonate Platforms in the Pacific and Indian Oceans. , ed. by Camoin, Gilbert F. and Davies, P. J.. Special publication of the International Association of Sedimentologists, 25 . Oxford, Blackwell Science, pp. 219-236. DOI 10.1002/9781444304879.ch11.

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Abstract

Mayotte fore-slopes exhibit a distinct pattern in overall morphology, starting in the deep with an unlithified sedimentary wedge and slope, followed upwards by a cemented slope, and finally by a steep, almost vertical wall. On top of the wall, drowned reefs occur. Dated corals may reveal the history of sea-level changes indicating pristine reef growth during late isotope stage 3 (at 55–24 ka) at a present-day water depth greater than 80 m. A maximum sea-level drop of 150 m occurred during the last glacial maximum, around 20 ka. This lowering of sea-level is documented by karst features such as small caves and corroded and jagged surfaces. The phase of deglaciation is recorded by two give-up reef levels at 100–90-m water depth and 65–55-m water depth which we may relate to the Bølling (14 ka) and post Younger Dryas (11.5 ka) meltwater pulses, known from the deep-sea record.

Document Type: Book chapter
Additional Information: Das Buch ist in der GEOMAR-Bibliothek vorhanden.
Keywords: oceanic reef case histories; morphology and sediments - fore-slopes of Mayotte, Comoro Islands; hydrographic regime around Comoros - control by southern equatorial current and Mozambique current; fore-slopes of Mayotte - similarities to coral reef fore-slopes; drowned reef mounds - fragile; prominent sea-level lowstand - oscillating around 80 m deep during late isotope stage; JAGO; DEEP SALVAGE I
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
DOI etc.: 10.1002/9781444304879.ch11
ISSN: 0141-3600
Expeditions/Models/Experiments:
Date Deposited: 18 Feb 2008 17:24
Last Modified: 02 Feb 2017 07:50
URI: http://oceanrep.geomar.de/id/eprint/6757

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