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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

Citation

Mauriohooho, K and Barker, SLL and Rae, A, 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 pp. 125-134. ISSN 0375-6505 (2016) [Refereed Article]


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DOI: doi:10.1016/j.geothermics.2016.03.005

Abstract

Portable 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 ∼15 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.

Item Details

Item Type:Refereed Article
Keywords:geothermal, portable XRF. X-ray fluorescence, chemostratigraphy, pXRF, Tauhara, element
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Inorganic Geochemistry
Objective Division:Energy
Objective Group:Energy Exploration
Objective Field:Geothermal Exploration
UTAS Author:Barker, SLL (Dr Shaun Barker)
ID Code:130375
Year Published:2016
Web of Science® Times Cited:6
Deposited By:CODES ARC
Deposited On:2019-01-23
Last Modified:2019-01-23
Downloads:0

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