Geomaterials in the age of megapixel imaging

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dc.contributor.authorBrugger, Jen_AU
dc.contributor.authorEtschmann, BEen_AU
dc.contributor.authorLi, Ken_AU
dc.contributor.authorMichaut, Pen_AU
dc.contributor.authorDonner, Een_AU
dc.contributor.authorHoward, DLen_AU
dc.date.accessioned2023-01-27T00:59:21Zen_AU
dc.date.available2023-01-27T00:59:21Zen_AU
dc.date.issued2016-02-04en_AU
dc.date.statistics2022-11-04en_AU
dc.description.abstractGeological samples are extremely diverse and share a tendency for heterogeneity and complexity. This is especially true for ores and for environmental samples, which result from complex processes in dynamic environments. In recent years, a number of tools that enable imaging element distribution in geological samples at 1-50μm-resolution and over cm2 areas have seen rapid development and have become readily available. The application of synchrotron-based X-ray fluorescence mapping has been limited to addressing key questions because of low availability and high cost. However, recent advances in X-ray fluorescence detector technology are bringing new possibilities to petrology. Millisecond dwell times allow collection of thin-section-size maps in hours, and improvement in data analysis produces quantitative elemental maps. The technique can be combined with XANES imaging to provide additional information about element speciation (e.g., As oxidation state). We illustrate applications of M(egapixel)-μXRF for ore petrology (commodities: Au, Pt, U, Cu, Ge, Ti, REE, Nb), coal petrology, and environmental samples. Examples of outcomes include: (i) the distribution of μm-sized Pt-rich grains and Ti-mobility during schistosity formation at the Fifield Pt prospect (Australia); (ii) confirmation of the two-stage Ge-enrichment in the Barrigão deposit (Portugal), with demonstration of the presence of Ge in solid solution in the early chalcopyrite; (iii) enrichment of U during late dissolution-reprecipitation reactions in the Cu-rich ores of the Moonta and Wallaroo IOCG deposits (Australia); (iv) history of REE-Ti-Nb-(As) mobility during amphibolite to greenschist facies metamorphism in the Binntal Valley, Switzerland; (v) contrasting distribution of As, Ge and W in Ge-rich coals across the Globe; and (vi) evolution of the distribution and speciation of Cu upon aging of biosolids.en_AU
dc.identifier.citationBrugger, J., Etschmann, B., Li, K., Michaut, P., Donner, E., & Howard, D. (2016). Geomaterials in the age of megapixel imaging. Paper presented to ACMM24 : Australian Conference on Microscopy and Analysis : Melbourne Convention and Exhibition Centre, 31 Jan-4 Feb 2016, (pp. 66-67).en_AU
dc.identifier.conferenceenddate4 February 2016en_AU
dc.identifier.conferencenameACMM24 : Australian Conference on Microscopy and Analysisen_AU
dc.identifier.conferenceplaceMelbourne, Australiaen_AU
dc.identifier.conferencestartdate31 January 2016en_AU
dc.identifier.isbn9780980337334en_AU
dc.identifier.pagination66-67en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14533en_AU
dc.language.isoenen_AU
dc.publisherAustralian Microscopy and Microanalysis Societyen_AU
dc.subjectGeologic depositsen_AU
dc.subjectOresen_AU
dc.subjectEnvironmenten_AU
dc.subjectSynchrotronsen_AU
dc.subjectX-ray fluorescence analysisen_AU
dc.subjectPetrologyen_AU
dc.subjectBiological evolutionen_AU
dc.subjectValenceen_AU
dc.subjectCoalen_AU
dc.titleGeomaterials in the age of megapixel imagingen_AU
dc.typeConference Abstracten_AU
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