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
Description
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]
Collections | ANU Research Publications |
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Date published: | 2006 |
Type: | Journal article |
URI: | http://hdl.handle.net/1885/25500 |
Source: | New Zealand Journal of Geology and Geophysics |
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01_Tulloch_A_carboniferous__40_/_39_Ar_2006.pdf | 938.01 kB | Adobe PDF | Request a copy |
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