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Porphyry fertility in the Northparkes district: indicators from whole-rock geochemistry

Wells, TJ, Meffre, S ORCID: 0000-0003-2741-6076, Cooke, DR ORCID: 0000-0003-3096-5658, Steadman, JA ORCID: 0000-0003-4679-3643 and Hoye, JL 2020 , 'Porphyry fertility in the Northparkes district: indicators from whole-rock geochemistry' , Australian Journal of Earth Sciences , doi: 10.1080/08120099.2020.1715477.

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Abstract

Four economic porphyry Cu–Au deposits and several prospects have been investigated in theNorthparkes district, part of the Ordovician to early Silurian Junee–Narromine Belt of theMacquarie Arc, New whole-rock geochemical data from the Northparkes porphyry Cu–Au district,NSW, indicate that the mineralising intrusive complexes exhibit distinct arc signatures that aretransitional from high-K calc-alkaline to silica-saturated alkalic. Based on ratios of Sr/Y vs Y (e.g. Sr/Y > -20 and Y KEY POINTS1. Mineralising intrusions in the Northparkes district have distinct Zr vs Y concentrations.2. The Zr vs Y indicator of magmatic fertility is less sensitive to alteration than Srbasedindicators.3. The Zr vs Y magmatic fertility indicator identified at Northparkes is not unique and identifiesmineralising intrusions in other porphyry fields.

Item Type: Article
Authors/Creators:Wells, TJ and Meffre, S and Cooke, DR and Steadman, JA and Hoye, JL
Keywords: macquarie arc, Northparkes, porphyry fertility, Ordovician intrusive rocks, prospectivity indicators
Journal or Publication Title: Australian Journal of Earth Sciences
Publisher: Taylor & Francis
ISSN: 0812-0099
DOI / ID Number: 10.1080/08120099.2020.1715477
Copyright Information:

Copyright 2020 Geological Society of Australia

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