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Disentangling interglacial sea level and global dynamic topography: Analysis of Madagascar

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)61-69
Number of pages9
JournalEarth and Planetary Science Letters
Volume519
Early online date20 May 2019
DOIs
DateAccepted/In press - 18 Apr 2019
DateE-pub ahead of print - 20 May 2019
DatePublished (current) - 1 Aug 2019

Abstract

Global inventories of stable sea-level markers for the peak of the last interglacial period, Marine Isotopic Stage (MIS) 5e, play a pivotal role in determining sea-level changes and in testing models of glacial isostatic adjustment. Here, we present surveying and radiometric dating results for emergent terraces from northern Madagascar, which is generally regarded as a stable equatorial site. Fossil coral specimens were dated using conventional and open-system corrected uranium series methods. Elevation of the upper (undated) terrace decreases from 33.8 m to 29.5 m over a distance of 35 km. An intermediate terrace has an average radiometric age of 130.7±13.2 ka (i.e. MIS 5e). Its elevation decreases from 9.3 m to 2.8 m over a distance of 80 km. The record of the lowest terrace is fragmentary and consists of beach rock containing rare corals with ages of 1.6–3.8 ka. The spatial gradient of the MIS 5e marker is inconsistent with glacio-isostatic adjustment calculations. Instead, we propose that variable elevations of this marker around Madagascar, and possibly throughout the Indian Ocean, at least partly reflect spatial patterns of dynamic topography generated by sub-plate mantle convection.

    Research areas

  • dynamic topography, geodynamics, glacial isostatic adjustment, last interglacial period, MIS 5e, sea level

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0012821X1930233X?via%3Dihub. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 43 MB, PDF document

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    Licence: CC BY-NC-ND

  • Supplementary information PDF

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0012821X1930233X?via%3Dihub. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 37 MB, PDF document

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    Licence: CC BY-NC-ND

  • Rebuttal Full-text PDF

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0012821X1930233X?via%3Dihub. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 132 KB, PDF document

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    Licence: CC BY-NC-ND

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