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

Colonna, M., Casanova, J., Dullo, Wolf-Christian and Camoin, G. (1996) Sea-Level Changes and δ18O Record for the Past 34,000 yr from Mayotte Reef, Indian Ocean. Quaternary Research, 46 (3). pp. 335-339. DOI 10.1006/qres.1996.0071.

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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.

Document Type: Article
Keywords: Sea-level changes, Mayotte Reef, Indian Ocean, JAGO
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
Publisher: Elsevier
Projects: TESTREEF
Date Deposited: 18 Feb 2008 17:23
Last Modified: 06 Jul 2017 13:37

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