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Sea-Level Changes and δ18O Record for the Past 34,000 yr from Mayotte Reef, Indian Ocean

Published online by Cambridge University Press:  20 January 2017

Michel Colonna ,
Joel Casanova ,
Wolf-Christian Dullo  and
Gilbert Camoin
Michel Colonna
Affiliation:
Department of Geochemistry, BRGM, 45060, Orleans Cedex 02, France
Joel Casanova
Affiliation:
Department of Geochemistry, BRGM, 45060, Orleans Cedex 02, France
Wolf-Christian Dullo
Affiliation:
GEOMAR, Wichhofstrasse, 1-3, D-24148, Kiel, Germany
Gilbert Camoin
Affiliation:
CNRS, CEREGE, University Aix-Marseille III, France
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Abstract

New sea-level and δ18O curves for the past 34,000 yr, based on uranium–thorium chronology, are proposed for the southwestern part of the Indian Ocean. The archives include cores drilled from onshore coral reefs and submersed samples from foreslope corals of Mayotte in the Comoro Islands. The Mayotte sea-level curve shows a lowstand of 145 ± 5 m below the present level during the last glacial maximum dated at 18,400 yr. This lowstand is supported by the maximum18O enrichment in the coral colonies. The residual signal (Δδ18O), controlled by sea-surface temperature changes, indicates that surface waters 18,400 yr ago were approximately 5°C cooler than present. The deglacial sea-level rise is clearly recorded, with a mean rate of about 1.7 cm yr−1between 18,400 and 10,000 yr ago. The deglaciation phase is characterized by a strong18O depletion marked by two pulses related to meltwater discharges into the North Atlantic Ocean but also characterized by responses specific to the tropical Indian Ocean.

Type
Short Paper
Information
Quaternary Research , Volume 46 , Issue 3 , November 1996 , pp. 335 - 339
Copyright
University of Washington

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