Submerged reef terraces of the Maldives (Indian Ocean) |
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Authors: | Jörn Fürstenau Sebastian Lindhorst Christian Betzler Christian Hübscher |
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Institution: | 1. Geologisch-Pal?ontologisches Institut, Universit?t Hamburg, Bundesstr. 55, 20146, Hamburg, Germany 2. Institut für Geophysik, Universit?t Hamburg, Bundesstr. 55, 20146, Hamburg, Germany
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Abstract: | There is limited knowledge about the record of sea-level rise from the last glacial maximum (LGM) until the onset of Holocene
reef growth in the Maldives archipelago. Multibeam data show that atoll slopes between 130 and 55 mbsl (meters below sea level)
are characterized by a step-like morphology. In parts, these terraces show a raised rim and a crenate geometry. Atoll margin
features can be interpreted as successive reef-growth and -drowning stages, which are attributable to changes in the rate
of sea-level rise. These changes can tentatively be correlated to known records of global sea-level change since the LGM.
In addition to terraces between 97 and 55 mbsl, which can be associated with the initiation of meltwater pulses MWP-1A and
-1B, several reef-drowning stages between 94 and 68 mbsl are proposed. As the Maldives can be considered a tectonically stable,
far-field site, the submerged reef terraces inferred from the first multibeam dataset for this region likely represent a valuable
archive for global deglacial sea-level history in the Indian Ocean. |
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