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

      , , ,
      Quaternary Research
      Elsevier BV

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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.

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          U-Th ages obtained by mass spectrometry in corals from Barbados: sea level during the past 130,000 years

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            Tropical Temperature Variations Since 20,000 Years Ago: Modulating Interhemispheric Climate Change

            Tropical sea surface temperatures (SSTs), as thermodynamically recorded in Barbados corals, were 5 degrees C colder than present values 19,000 years ago. Variable tropical SSTs may explain the interhemispheric synchroneity of global climate change as recorded in ice cores, snowline reconstructions, and vegetation records. Radiative changes due to cloud type and cloud cover are plausible mechanisms for maintaining cooler tropical SSTs in the past.
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              Island subsidence, hot spots, and lithospheric thinning

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                Author and article information

                Journal
                applab
                Quaternary Research
                Quat. res.
                Elsevier BV
                0033-5894
                1096-0287
                November 1996
                January 2017
                : 46
                : 03
                : 335-339
                Article
                10.1006/qres.1996.0071
                e640a5cb-2ab5-4d3d-b379-3fb686200549
                © 1996

                http://www.elsevier.com/tdm/userlicense/1.0/

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