Dwyer, Ryan C., Forster, David B., Simpson, Brenainn P., Blevin, Phillip L., and Huang, Huiqing (2025) Relationships between high-K magmas and Cu–Au porphyry deposits in the Macquarie Arc, Australia. Geological Society, London, Special Publication, 551 (1). pp. 259-300.

Preview

PDF (Published Version) - Published Version Available under License Creative Commons Attribution. Download (13MB) | Preview

Abstract

The Macquarie Arc is a long-lived volcanic arc terrane which began in the latest Cambrian and continued until the early Silurian. Early Silurian high-K suites associated with Cu–Au porphyry mineralization are typically considered shoshonitic; however, comparisons with well-studied examples of shoshonites in continental arcs and associated settings suggest few Macquarie Arc rocks would classify as shoshonitic. Notably, the Au-rich Cadia Intrusive Complex, which is marginally shoshonitic, and most high-K to 'shoshonitic' Macquarie Arc rocks are essentially high-K calc-alkaline, analogous to 'primitive' shoshonites generated within intraoceanic arc settings. Arc magmatism in the Macquarie Arc is consistently primitive and mantle derived prior to an increase in siliciclastic input and crustal thickening during the Silurian Benambran Orogeny, consistent with prior isotopic studies. Magma source regions can thus be interpreted as varying spatially and temporally due to variable enrichment from slab and mantle derived components, reflecting a maturing and potentially migrating arc system.

Item ID:	86456
Item Type:	Article (Research - C1)
ISSN:	2041-4927
Copyright Information:	© 2024 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). Published by The Geological Society of London.
Date Deposited:	05 Aug 2025 00:48
FoR Codes:	37 EARTH SCIENCES > 3705 Geology > 370502 Geochronology @ 30% 37 EARTH SCIENCES > 3705 Geology > 370505 Mineralogy and crystallography @ 30% 37 EARTH SCIENCES > 3705 Geology > 370503 Igneous and metamorphic petrology @ 40%
SEO Codes:	25 MINERAL RESOURCES (EXCL. ENERGY RESOURCES) > 2503 Mineral exploration > 250302 Copper ore exploration @ 100%
Downloads:	Total: 1 Last 12 Months: 1
	More Statistics