Heat-producing crust regulation of subsurface temperatures : a stochastic model re-evaluation of the geothermal potential in western Queensland, Australia

Siégel, Coralie, Schrank, Christoph, Bryan, Scott Edward, Beardsmore, Graeme, & Purdy, David John (2014) Heat-producing crust regulation of subsurface temperatures : a stochastic model re-evaluation of the geothermal potential in western Queensland, Australia. Geothermics, 51, pp. 182-200.

[img] Supplement 1 (MS Excel 2007 449kB)
Supplemental Material. Thermal conductivity estimates of sedimentary formations.
[img] Supplement 2 (MS Excel 2007 404kB)
Supplemental Material. Thermal conductivity, basement heat production and temperature measurements used in the stochastic model.
[img] Supplement 3 (MS Excel 2007 37kB)
Supplemental Material. Results of the stochastic model including temperature and heat flow estimates at 5 km depth.
Accepted Version (PDF 9MB)

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A large subsurface, elevated temperature anomaly is well documented in Central Australia. High Heat Producing Granites (HHPGs) intersected by drilling at Innamincka are often assumed to be the dominant cause of the elevated subsurface temperatures, although their presence in other parts of the temperature anomaly has not been confirmed. Geological controls on the temperature anomaly remain poorly understood. Additionally, methods previously used to predict temperature at 5 km depth in this area are simplistic and possibly do not give an accurate representation of the true distribution and magnitude of the temperature anomaly. Here we re-evaluate the geological controls on geothermal potential in the Queensland part of the temperature anomaly using a stochastic thermal model. The results illustrate that the temperature distribution is most sensitive to the thermal conductivity structure of the top 5 km. Furthermore, the results indicate the presence of silicic crust enriched in heat producing elements between and 40 km.

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ID Code: 63373
Item Type: Journal Article
Refereed: Yes
Keywords: geothermal, Australia, heat flow, thermal conductivity, stochastic modelling, inversion modelling
DOI: 10.1016/j.geothermics.2014.01.005
ISSN: 0375-6505
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Geothermics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geothermics, [VOL 51, (2014)] DOI: 10.1016/j.geothermics.2014.01.005
Deposited On: 16 Oct 2013 03:01
Last Modified: 11 Aug 2016 04:01

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