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. . Special Publication of the International Association of Sedimentologists, 25 . Blackwell Science, Oxford, pp. 217-236. ISBN 0-632-04778-X DOI 10.1002/9781444304879.ch11.

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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
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
DOI etc.: 10.1002/9781444304879.ch11
Date Deposited: 17 Jan 2018 12:55
Last Modified: 17 Jan 2018 12:55

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