A carboniferous 40 / 39 Ar amphibole emplacement age for the Au-bearing Sams Creek alkali-feldspar granite dike, west Nelson, New Zealand
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|
|Source:||New Zealand Journal of Geology and Geophysics|
|01_Tulloch_A_carboniferous__40_/_39_Ar_2006.pdf||938.01 kB||Adobe PDF||Request a copy|
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.