Evaluating the role of deep granitic rocks in generating anomalous temperatures in SW-Queensland

Siegel, C., Bryan, S.E., Purdy, David, Allen, C.M., Schrank, C., Uysal, Tonguc, Gust, D., & Beardsmore, Graeme (2012) Evaluating the role of deep granitic rocks in generating anomalous temperatures in SW-Queensland. In Queensland Geological Record 2012/14., Geological Survey of Queensland, University of Queensland, Brisbane, Australia, pp. 95-101.

Abstract

Across central Australia and south-west Queensland, a large (~800,000km2) subsurface temperature anomaly occurs (Figure 1). Temperatures are interpreted to be greater than 235°C at 5km depth, ca. 85°C higher than the average geothermal gradient for the upper continental crust (Chopra & Holgate, 2005; Holgate & Gerner, 2011). This anomaly has driven the development of Engineered Geothermal Systems (EGS) at Innamincka, where high temperatures have been related to the radiogenic heat production of High Heat Producing Granites (HHPG) at depth, below thermally insulative sedimentary cover (Chopra & Holgate, 2005; Draper & D’Arcy, 2006; Meixner & Holgate, 2009). To evaluate the role of granitic rocks at depth in generating the broader temperature anomaly in SW-Queensland, we sampled 25 granitic rocks from basement intervals of petroleum drill cores below thermal insulative cover along two transects (WNW–ESE and NNE–SSW — Figure 1) and performed a multidisciplinary study involving petrography, whole-rock chemistry, zircon dating and thermal conductivity measurements.

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ID Code: 58603
Item Type: Conference Paper
Refereed: No
Keywords: 040303, 040313, 040304
ISBN: 9781922067173
ISSN: 1039-5547
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 State of Queensland (Department of Natural Resource and Mines)
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Deposited On: 24 Mar 2013 23:13
Last Modified: 26 Mar 2013 05:44

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