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Using portable XRF to infer adularia halos within the Waihi Au-Ag system, New Zealand


Hughes, R and Barker, SLL, Using portable XRF to infer adularia halos within the Waihi Au-Ag system, New Zealand, Geochemistry: Exploration, Environment, Analysis, 18 pp. 97-108. ISSN 1467-7873 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 The Author(s).

DOI: doi:10.1144/geochem2016-006


Waihi Au-Ag mineralization is vein hosted within a relatively homogeneous andesite body. Geochemical exploration targets adularia and pathfinder (As, Sb, Hg etc.) anomalies. Adularia is formed as an alteration product of feldspars during hydrothermal alteration and occurs in anomalous concentrations near Au-Ag mineralization. This paper aims to test the potential of portable X-ray fluorescence (pXRF) to infer and map adularia and As anomalies. The pXRF was first tested on standards (CRM and ILD), it yielded accurate and precise data for most of the elements of interest (r2 > 0.9 and APD < 10%). The second stage applied the pXRF directly on core, most elements were negatively affected, but still to a usable degree of accuracy. As was particularly effected due to its heterogeneous distribution (APD 46%). Lastly, we applied the pXRF to a suite of 300 Favona samples, their K/Al value were used as a proxy for adularia presence. XRD analysis carried out on 60 samples was used to validate adularias presence or absence. When combined with pXRF data we found a K/Al value above 0.4 generally indicated a sample contained adularia. Therefore, with further work, the pXRF could be independently used to infer adularia alteration in the Waihi setting.

Item Details

Item Type:Refereed Article
Keywords:adularia, portable XRF, x-ray fluorescence, Waihi, New Zealand, andesite, geochemistry, pXRF, Waihi Gold mine, Au-Ag mineralization, alteration
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration geochemistry
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Mineral exploration
Objective Field:Precious (noble) metal ore exploration
UTAS Author:Barker, SLL (Dr Shaun Barker)
ID Code:130380
Year Published:2017
Web of Science® Times Cited:9
Deposited By:CODES ARC
Deposited On:2019-01-23
Last Modified:2019-03-28

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