Morphology and Sediments of the Fore-Slopes of Mayotte, Comoro Islands: Direct Observations from a Submersible

  1. G. F. Camoin7 and
  2. P. J. Davies8
  1. W.-Ch. Dullo1,
  2. G. F. Camoin2,7,
  3. D. Blomeier1,
  4. M. Colonna3,
  5. A. Eisenhauer4,
  6. G. Faure5,
  7. J. Casanova3 and
  8. B. A. Thomassin6

Published Online: 27 MAY 2009

DOI: 10.1002/9781444304879.ch11

Reefs and Carbonate Platforms in the Pacific and Indian Oceans

Reefs and Carbonate Platforms in the Pacific and Indian Oceans

How to Cite

Dullo, W.-Ch., Camoin, G. F., Blomeier, D., Colonna, M., Eisenhauer, A., Faure, G., Casanova, J. and Thomassin, B. A. (2009) 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 (eds G. F. Camoin and P. J. Davies), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304879.ch11

Editor Information

  1. 7

    CEREGE, Aix-en-Provence, France

  2. 8

    University of Sydney, Australia

Author Information

  1. 1

    GEOMAR, Wischhofstr. 1-3, D-24148 Kiel, Germany

  2. 2

    CEREGE, URA 132 du CNRS, Université Aix Marseille III, BP 80, F-13545 Aix en Provence, Cedex 4, France

  3. 3

    BRGM, BP 6009, Avenue de Concyr, F-45060 Orléans Cedex 2, France

  4. 4

    Institut für Geochemie, Goldschmidtstr. 3, D-37077 Göttingen, Germany

  5. 5

    Laboratoire d'Hydrobiologie Marine, Université Montpellier II, Case 93, F-34094 Montpellier Cedex, France

  6. 6

    Centre d'Océanologie de Marsaille, Traverse Batterie des Lions, F-13007 Marseille, France

  7. 7

    CEREGE, Aix-en-Provence, France

Publication History

  1. Published Online: 27 MAY 2009
  2. Published Print: 23 MAR 1998

ISBN Information

Print ISBN: 9780632047789

Online ISBN: 9781444304879

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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

Summary

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.