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A carboniferous 40 / 39 Ar amphibole emplacement age for the Au-bearing Sams Creek alkali-feldspar granite dike, west Nelson, New Zealand

Tulloch, Andrew; Dunlap, William James


A peralkaline alkali-feldspar granite dike associated with Au-sulfide mineralisation at Sams Creek has previously yielded inconsistent Triassic K-Ar ages, and has thwarted attempts at U-Pb zircon dating. We report here a disturbed 40Ar/39Ar step heating spectrum and both single and multi-grain laser fusion analyses of amphibole, from which we interpret an age of 319 ± 8 Ma (MSWD 0.05) for dike emplacement. Although the sample is a complex mix of arfvedsonite and late-stage riebeckite of...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: New Zealand Journal of Geology and Geophysics


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