A reassessment of the age of the Cockburn Island Formation, northern Antarctic Peninsula, and its palaeoclimatic implications

New constraints on the age of the Cockburn Island Formation, northern Antarctic Peninsula, resulting from whole rock laser-stepped heated 40Ar–39Ar dating of associated basalt and palaeomagnetic re-calibration of the ranges of the formation’s fossil diatom taxa, suggest that interglacial conditions...

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Bibliographic Details
Published in:Journal of the Geological Society
Main Authors: Jonkers, H. A., Kelley, S. P.
Format: Article in Journal/Newspaper
Language:unknown
Published: Geological Society of London 1998
Subjects:
Antarctic
Antarctic Peninsula
East Antarctica
Cockburn
Cockburn Island
Antarc*
Antarctica
Online Access:http://nora.nerc.ac.uk/id/eprint/504103/
https://doi.org/10.1144/gsjgs.155.5.0737
Description
Summary:New constraints on the age of the Cockburn Island Formation, northern Antarctic Peninsula, resulting from whole rock laser-stepped heated 40Ar–39Ar dating of associated basalt and palaeomagnetic re-calibration of the ranges of the formation’s fossil diatom taxa, suggest that interglacial conditions existed around 3 million years ago. The refined age of the deposit supports continent-wide Late Pliocene warming in Antarctica, and makes more likely the occurrence of extensive marine incursions in East Antarctica at that time.

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