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Short-term Antarctic ice-sheet dynamics during the late Oligocene

Palaeoceanographic records spanning the Oligocene provide insights into Antarctic ice-sheet dynamics in a world warmer-than-today, allowing us to improve future climate projections linked to global warming. Here, we present a high-resolution multi-proxy record from ODP Site 689 (Maud Rise, Southern...

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Hauptverfasser: Creac'h, Layla (Verfasst von) , Brzelinski, Swaantje (Verfasst von) , Lippold, Jörg (Verfasst von) , Gutjahr, Marcus (Verfasst von) , Frank, Martin (Verfasst von) , Fischer, Alexa (Verfasst von) , Friedrich, Oliver (Verfasst von)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 22 January 2026
In: Communications earth & environment
Year: 2026, Jahrgang: 7, Pages: 1-12
ISSN:2662-4435
DOI:10.1038/s43247-026-03217-4
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s43247-026-03217-4
Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s43247-026-03217-4
Volltext
Verfasserangaben:Layla Creac’h, Swaantje Brzelinski, Jörg Lippold, Marcus Gutjahr, Martin Frank, Alexa Fischer & Oliver Friedrich
Beschreibung
Zusammenfassung:Palaeoceanographic records spanning the Oligocene provide insights into Antarctic ice-sheet dynamics in a world warmer-than-today, allowing us to improve future climate projections linked to global warming. Here, we present a high-resolution multi-proxy record from ODP Site 689 (Maud Rise, Southern Ocean), to investigate the short-term Antarctic ice-sheet variability during the late Oligocene. Our oxygen isotope composition of sea water record reflects large, obliquity-paced ice volume fluctuations from 26.2 to 25.2 Ma. These fluctuations would have resulted in changes in the types of rocks eroded as the Antarctic ice-sheet advanced/retreated. Indeed, the radiogenic isotopic compositions of neodymium and lead co-vary with the oxygen isotopes for most of the record and identify changes in sediment provenance and weathering rates linked to advances and retreats of the Antarctic ice-sheet. At the same time, the stable incongruent lead isotope signal observed confirms the presence of a major East Antarctic ice-sheet during the late Oligocene.
Beschreibung:Veröffentlicht: 22. Januar 2026
Gesehen am 20.03.2026
Beschreibung:Online Resource
ISSN:2662-4435
DOI:10.1038/s43247-026-03217-4

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