Heat transfer across the Hrossatungur gabbro in the Hafnarfjall C.V, W-Iceland

James Brett, Hjalti Franzson and Moneer Althenary

Project Outline

• Initiated in July 2013 with a three year GEORG grant to evaluate the process of magma/water interation at the base of geothermal systems.

• 5.5-4Ma Hafnarfjall-Skarðsheiði central volcano now deeply exposed.

• The study could serve as pilot work for further work on analogous intrusions.

• Valuable information gathered for the exploration of active intrusion related geothermal systems with extreme temperatures.

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Conclusions• The eroded interior of the 5,5 - 4 Ma Hafnarfjall-Skarðsheiði central

volcano in W-Iceland portrays an excellent example for the workings of an intrusive induced geothermal system.

• The dissimilar contacts of the gabbro demonstrates the vast differences between a conductive contact versus direct water / magma interaction.

• It has highlighted that with a renewal of a fresh ground water against an intrusion, a very efficient convective heat transfer mechanism can develop.

Thank you for your attention

james.brett@hotmail.com