Oligocene and Pliocene interglacial events in the Antarctic Peninsula dated using strontium isotope stratigraphy

Dingle, R. V.; McArthur, J. M.; Vroon, P.. 1997 Oligocene and Pliocene interglacial events in the Antarctic Peninsula dated using strontium isotope stratigraphy. Journal of the Geological Society, 154 (2). 257-264. 10.1144/gsjgs.154.2.0257

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Abstract/Summary

Strontium isotope stratigraphy is used to date two interglacial-marine deposits in the Antarctic Peninsula region. On King George Island, interglacial pectinid-rich sediments in the Low Head Member of the Polonez Cove Formation give a strontium isotope stratigraphy age of 29.0+0.7−0.6 to 29.8+0.8−0.7 Ma (mid-Oligocene), which, in conjunction with previous K–Ar dating of volcanic rocks, indicates a glacial episode in the Antarctic Peninsula between middle Eocene (42.0 ±1.0 Ma) and mid-Oligocene time. In addition, an inter-glacial deposit (Pecten Conglomerate) from tectonically-elevated exposures on Cockburn Island is dated as Pliocene (3.5–5.3 Ma). Published data suggest these latter sediments were deposited under shallow marine conditions, which were warmer than those of present-day Antarctica.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1144/gsjgs.154.2.0257
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0016-7649
Additional Keywords:	Oligocene, Pliocene, Antarctic Peninsula, 67Sr86Sr, interglacial environments
Date made live:	13 Sep 2016 08:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/514456

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