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dc.contributor.authorMauriohooho, Kateen_NZ
dc.contributor.authorBarker, Shaun L.L.en_NZ
dc.contributor.authorRae, Andrewen_NZ
dc.date.accessioned2016-08-17T23:26:51Z
dc.date.available2016en_NZ
dc.date.available2016-08-17T23:26:51Z
dc.date.issued2016en_NZ
dc.identifier.citationMauriohooho, K., Barker, S. L. L., & Rae, A. (2016). Mapping lithology and hydrothermal alteration in geothermal systems using portable X-ray fluorescence (pXRF): A case study from the Tauhara geothermal system, Taupo Volcanic Zone. Geothermics, 64, 125–134. http://doi.org/10.1016/j.geothermics.2016.03.005en
dc.identifier.issn1879-3576en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10601
dc.description.abstractPortable x-ray fluorescence (pXRF) analyzers are widely used in the environmental and mineral exploration fields. pXRF analyzers can rapidly and inexpensively provide chemical concentrations on a variety of elements, often with detection limits of ∼1–5 ppm. We compared portable XRF results from untreated geothermal drill cuttings with laboratory XRF results from pressed pellet and lithium borate fused beads prepared from powders crushed from the same samples. It is demonstrated that the portable XRF results are accurate for many elements, particularly for those with atomic numbers greater than 17. 304 cutting samples from three drillholes in the Tauhara geothermal field were subsequently analyzed by pXRF. Downhole elemental concentrations plotted against lithological units defined on geological well logs indicate that significant variations in elemental concentrations occur, some of which correlate with logged lithology boundaries. Other chemical variations appear to define previously unrecognized subunits, as well as areas of hydrothermal alteration. We suggest that pXRF should become a routine part of the characterization of geothermal cuttings during geothermal exploration and well drilling, as the chemical results are accurate, rapid and inexpensive, and the results can be used to define lithological boundaries and potentially correlate between drillholes, therefore improving geologic, stratigraphic and hydrothermal alteration models of the geothermal field.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherElsevieren_NZ
dc.subjectpXRFen_NZ
dc.subjectChemostratigraphyen_NZ
dc.subjectTauharaen_NZ
dc.subjectGeochemistryen_NZ
dc.subjectGeothermalen_NZ
dc.subjectElementen_NZ
dc.titleMapping lithology and hydrothermal alteration in geothermal systems using portable X-ray fluorescence (pXRF): A case study from the Tauhara geothermal system, Taupo Volcanic Zoneen_NZ
dc.typeJournal Article
dc.identifier.doi10.1016/j.geothermics.2016.03.005en_NZ
dc.relation.isPartOfGeothermicsen_NZ
pubs.begin-page125
pubs.elements-id138857
pubs.end-page134
pubs.volume64en_NZ
uow.identifier.article-noCen_NZ


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