1887
Volume 38, Issue 4
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Heat flow has been measured in south-east South Australia at a spatial resolution greater than previously available. The study area contains the Southern Murray Basin, Padthaway Ridge, and Western Otway Basin. An extensive network of groundwater observation wells across the study area was used, along with several petroleum wells in the Otway Basin, to measure thermal gradients and calculate 24 new heat flow values.

Geothermal gradients were either measured directly using a cable, winch, and thermistor in cased or open holes with standing water, or by estimating average geothermal gradients from petroleum well completion temperature data. Thermal conductivity values were measured directly on existing core samples using a divided bar apparatus.

A map constructed from the measured values reveals a heat flow dataset that is non-uniform and variable over relatively short distances. Measured heat flow values range between 42 and 123 mW/m–2. In particular, a 40 km long, 15 km wide zone of elevated heat flow is identified along the northern margin of the Otway or Gambier Sub-basin that may correspond to the occurrence of Delamerian granitoids units of the Padthaway Ridge. High-resolution surface heat flow mapping provides valuable data for further research into the tectonothermal evolution of south-east Australia.

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References

  1. Beardsmore G. R. 2005, Thermal modelling of the hot dry rock geothermal resource beneath GEL99 in the Cooper Basin Proceedings World Geothermal Congress, Antalya, Turkey, 24–29 April, 2005.
  2. Beardsmore G. R. , and Cull J. P. 2001, Crustal heat flow; a guide to measurement and modelling, Cambridge University Press.
  3. Boult P. J. , and Hibburt J. E., (eds) 2002, The Petroleum Geology of South Australia Vol 1, The Otway Basin, 2nd Edition South Australia, Department of Primary Industries and Resources, Petroleum Geology of South Australia Series, Vol. 1.
  4. Cull J. P. 1982 An appraisal of Australian heat-flow data: BMR Journal of Australian Geology and Geophysics 7 11 21
    [Google Scholar]
  5. Foden J. D. Elburg M. A. Turner S. P. Sandiford M. 2002 Granite production in the Delamerian Orogen, South Australia: Journal of the Geological Society 159 557 575
    [Google Scholar]
  6. Houseman G. A. Cull J. P. Muir P. M. Paterson H. L. 1989 Geothermal signatures and uranium ore deposits on the Stuart Shelf of South Australia: Geophysics 54 158 170 doi:10.1190/1.1442640
    [Google Scholar]
  7. Jenkins R. J. F. Sandiford M. 1992 Observations on the tectonic evolution of the Southern Adelaide Fold Belt: Tectonophysics 214 27 36 doi:10.1016/0040-1951(92)90188-C
    [Google Scholar]
  8. Jessop A. M. 1990, Developments in Solid Earth Geophysics, Vol. 17, Thermal Geophysics. Elsevier.
  9. Lachenbruch A. H. , and Brewer M. C. 1959, Dissipation of the temperature effect of drilling a well in Arctic Alaska United States Geological Survey Bulletin, 1083-C, 73–109.
  10. McBride J. S. Lambert D. D. Greig A. Nicholls I. A. 1996 Multistage evolution of Australian subcontinental mantle; Re-Os isotopic constraints from Victorian mantle xenoliths: Geology (Boulder) 24 631 634 doi:10.1130/0091-7613(1996)024<0631:MEOASM>2.3.CO;2
    [Google Scholar]
  11. McLaren S. Sandiford M. Hand M. Neumann N. Wyborn L. Bastrakova I., 2003 The hot southern continent, heat flow and heat production in Australian Proterozoic terranes: Geological Society of Australia, Special Publication, 22 151 161
    [Google Scholar]
  12. Neumann N. Sandiford M. Foden J., 2000 Regional geochemistry and continental heat flow: implications for the origin of the South Australian heat flow anomaly: Earth and Planetary Science Letters 183 107 120 doi:10.1016/S0012-821X(00)00268-5
    [Google Scholar]
  13. O’Brien G. W. Reeves C. V. Milligan P. R. Morse M. P. Alexander E. M. Willcox J. B. Yunxuan Z. Finlayson D. M. Brodie R. C. 1994 New ideas on the rifting history and structural architecture of the western Otway Basin: evidence from the integration of aeromagnetic, gravity and seismic data: APEA Journal 34 529 555
    [Google Scholar]
  14. Rogers P. A. , Lindsay J. M. , Alley N. F. , Barnett S. R. , Lablack K. L. , and Kwitco G. 1995, Murray Basin In J F., Drexel, and W V., Preiss (eds) The Geology of South Australia Vol 2, The Phanerozoic South Australia Geological Survey, Bulletin 54.
  15. Sandiford M. 2003, Neotectonics of SE Australia and the origin of the intraplate stress field in Skilbeck, C G., Hubble, C T., Thomas (eds) Understanding Planet Earth; searching for a sustainable future; abstracts of the 15th Australian geological convention, Abstracts – Geological Society of Australia.
  16. Sandiford M. Frederiksen S. Braun J. 2003 The long-term thermal consequences of rifting: implications for basin reactivation: Basin Research 15 23 43 doi:10.1046/j.1365-2117.2003.00196.x
    [Google Scholar]
  17. Sheard M. J. 1990 A guide to Quaternary volcanoes in the lower south-east of South Australia: Mines and Energy Review – South Australia 157 40 50
    [Google Scholar]
  18. Turner S. P. Foden J. D. Morrison R. 1992 Derivation of A-type magma by fractionation of basaltic magma and an example from the Padthaway Ridge, South Australia: Lithos 28 151 179 doi:10.1016/0024-4937(92)90029-X
    [Google Scholar]
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