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K-Ar geochronology of Marion Island, southern Ocean

McDougall, Ian; Verwoerd, W; Chevallier, L P


Marion Island is a youthful intraplate shield volcano in the Southern Ocean, generally considered to represent the location of a mantle plume. New K-Ar age determinations on 37 whole rock samples of so-called older grey basalt from the island range from 450 ± 10 to ∼ 30 ka. The lavas are remarkably fresh and holocrystalline, appearing to be ideal for dating. The age results from two almost vertical sections, where relative age relationships are not in doubt, are in accord with the stratigraphy....[Show more]

CollectionsANU Research Publications
Date published: 2001
Type: Journal article
Source: Geological Magazine
DOI: 10.1017/S0016756801005039


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