The Silica Heat Flow Interpretation Technique- Application To Continental Australia

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Journal Article: The Silica Heat Flow Interpretation Technique- Application To Continental Australia

Abstract
The silica heat flow interpretation technique (Swanberg, C.A. and Morgan, P., J. Geophys. Res. 117 (1979) 227-241; J. Geophys. Res. 85 (1980) 7206-7214) has been applied and tested in mainland Australia, using a database of approximately 41 000 Australian groundwater analyses. The silica geotemperature of the groundwaters was obtained by substituting the dissolved silica content of a groundwater into the quartz geothermometer equation of Truesdell ((1976) Proceedings of the Second United Nations Symposium on the Development and Use of Geothermal Resources. San Francisco, CA, USA, 20-29 May, 1975, Vol. 1). The average silica geotemperature value for 1_1° (latitude_longitude) grid cells has been calculated and the results plotted against published traditional heat flow values for those grid cells (Cull, J.P. (1982) BMR J. Aust. Geol. Geophys. 7, 11-21), to form silica heat flow estimation models. Data exclusion criteria, based upon data quantity and statistical spread have been applied to both the groundwater data and the traditional heat flow data. This was done in order to exclude areas that were poorly categorized in terms of data quality and quantity. For the remaining data, a significant linear relationship between the groundwater geotemperature estimates and traditional heat flow measurements has been identified for four of the models with a t-test on the correlation coefficient. Estimates of regional heat flow were then made by applying the calibration models in areas with no traditional heat flow measurements but adequate groundwater data. A silica heat flow map has been constructed using one of the models and the differences between it and the traditional heat flow map evaluated. Good correlations exist between the silica heat flow map and the traditional heat flow map, except for the northwest Yilgarn, of WA, Australia, where silica heat flow data give significantly higher values than traditional data. The silica heat flow map identifies areas of high heat flow associated with some large-scale geological features such as the granite belt in southeastern Australia. The calibration models result in some silica heat flow estimates exceeding natural likely values. This suggests that the calibrations need further refining for Australian conditions.

Author 
M. C. Pirlo








Published Journal 
Journal of Volcanology and Geothermal Research, 2002





DOI 
Not Provided
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Citation

M. C. Pirlo. 2002. The Silica Heat Flow Interpretation Technique- Application To Continental Australia. Journal of Volcanology and Geothermal Research. (!) .