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Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data

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Ahmed, A, Crawford, A, Leslie, C, Phillips, J, Wells, T, Garay, A, Hood, SB ORCID: 0000-0002-5680-7597 and Cooke, DR ORCID: 0000-0003-3096-5658 2019 , 'Assessing copper fertility of intrusive rocks using field portable X-Ray fluorescence (pXRF) data' , Geochemistry: Exploration, Environment, Analysis, vol. 20, no. 2020 , pp. 81-97 , doi: 10.1144/geochem2018-077.

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Abstract

Based on a global compilation of whole-rock geochemical data, Sr/Y and Sr/MnO are identified as effective discriminators between ore-forming and unprospective intrusions in the porphyry Cu setting. Intrusive rocks are classified into three fertility groups prospective, unprospective and mixed-signal designed to assist explorers as a discrimination tool, narrowing the exploration search space in porphyry Cu districts.Portable X-ray fluorescence (pXRF) data of Sr, Y and MnO were collected on pulp powders and rock slabs from six porphyry Cu (±Mo ± Au) districts. Pre- and post-mineralization intrusions from porphyry Cu districts have lower Sr/Y and Sr/MnO values than syn-mineralization intrusions from the same districts, although absolute values are variable between districts.pXRF data were compared to conventional whole-rock data to determine if pXRF data were appropriate substitutes for conventional whole-rock methods of evaluating the ore-forming potential of intrusive rocks. pXRF data collected on pulp material were found to be more accurate (within 16% of conventional methods) and more precise (

Item Type: Article
Authors/Creators:Ahmed, A and Crawford, A and Leslie, C and Phillips, J and Wells, T and Garay, A and Hood, SB and Cooke, DR
Keywords: porphyry, fertility, whole rock geochemistry, pXRF, copper, gold
Journal or Publication Title: Geochemistry: Exploration, Environment, Analysis
Publisher: Geological Society Publishing House
ISSN: 1467-7873
DOI / ID Number: 10.1144/geochem2018-077
Copyright Information:

Copyright © 2019 The Author(s). Published by The Geological Society of London for GSL and AAG. All rights reserved.

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