Journal article
Pb-isotopic constraints on the source of A-type Suites: Insights from the Hiltaba Suite - Gawler Range Volcanics Magmatic Event, Gawler Craton, South Australia
ND Chapman, M Ferguson, SJ Meffre, A Stepanov, R Maas, KJ Ehrig
Lithos | Published : 2019
Abstract
The 1595–1575 Ma Hiltaba Suite intrusives and coeval Gawler Range Volcanics (GRV) represent a significant crustal component of the Mesoarchean-Mesoproterozoic Gawler Craton, South Australia, and one of the largest silicic igneous provinces in the world. They are also spatially and temporally-affiliated with world-class IOCG mineral deposits (i.e. Olympic Dam) thus making an understanding of these rocks important both economically, and petrologically. Here, we present the results of 177 in situ Pb-isotopic analyses of alkali feldspar in the Hiltaba Suite/GRV, which when integrated with existing Sm[sbnd]Nd isotopic and geochemical data, reveal a craton-wide isotopic zoning. Pb-isotopic zonatio..
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Funding Acknowledgements
This research was funded by BHP Olympic Dam Operations, Adelaide, Australia, which we gratefully thank. We also thank Jay Thompson from the CODES LA-ICP-MS laboratory as well as Karsten Gormann and Sandrin Feig from the Central Science Laboratory for their technical assistance. The editorial handling by Andrew Kerr and input from three anonymous reviewers is greatly appreciated and improved the manuscript significantly.