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Use and calibration of portable X-ray fluorescence analysers; application to lithogeochemical exploration for komatiite-hosted nickel sulphide deposits

Margaux Le Vaillant, Stephen J. Barnes, Louise Fisher, Marco L. Fiorentini and Stefano Caruso
Use and calibration of portable X-ray fluorescence analysers; application to lithogeochemical exploration for komatiite-hosted nickel sulphide deposits
Geochemistry - Exploration, Environment, Analysis (February 2014) 14 (3): 199-209

Abstract

Portable X-Ray Fluorescence (pXRF) analysers allow on-site geochemical analysis of rock powders and drill core. The main advantages of pXRF analysis over conventional laboratory analysis are the speed of data collection and the low cost of the analyses, permitting the collection of extensive, spatially representative datasets. However, these factors only become useful if the quality of the data meets the requirements needed for the purposes of the study. Here, we evaluate the possible use of portable XRF to determine element concentrations and ratios used in exploration for komatiite-hosted nickel sulphides.A portable XRF analyser was used to measure a series of chalcophile and lithophile element concentrations (Si, S, K, Ca, Ti, Cr, Fe, Ni, Cu, Zn, As, Sr, and Zr) of 75 samples from three komatiite units associated with nickel sulphide ores in the Yilgarn Craton, Western Australia. Crucial steps in the study were the development of a strict calibration process as well as numerous data quality checks. The 670 analyses collected in this study were compared with conventional laboratory XRF data on discriminant diagrams commonly utilized in exploration for komatiite-hosted nickel sulphides (Cr vs Ni and Ni/Ti vs Ni/Cr). After comparing the results obtained with pXRF during this study with the laboratory values, we can conclude that portable XRF analyses can be used for rapid assessment of the nickel sulphide prospectivity of komatiites provided that strict control protocols are followed.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 14
Serial Issue: 3
Title: Use and calibration of portable X-ray fluorescence analysers; application to lithogeochemical exploration for komatiite-hosted nickel sulphide deposits
Affiliation: University of Western Australia, Centre for Exploration Targeting, Crawley, West. Aust., Australia
Pages: 199-209
Published: 20140205
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
Number of pages: unpaginated
References: 32
Accession Number: 2014-019771
Categories: General geochemistryEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, geol. sketch map
S28°00'00" - S27°30'00", E120°30'00" - E121°00'00"
Secondary Affiliation: CSIRO, AUS, AustraliaUniversita degli Studi di Milano, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201413
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