Magnetic method in geothermal resource exploration-A case study of Rotoma-Tikorangi geothermal prospect

Citation:
Mulwa J, Soengkono S. "Magnetic method in geothermal resource exploration-A case study of Rotoma-Tikorangi geothermal prospect.". In: Proceedings: 11th Conference of the Geological Society of Kenya. Grand Regency Hotel, Nairobi, Kenya: Geological Society of Kenya; 2006.

Date Presented:

21 March 2006

Abstract:

The Rotoma-Tikorangi geothermal prospect is situated about 26 km northeast of Rotorua in New Zealand. It is associated with Okataina Volcanic Centre in the Taupo Volcanic Zone. A low level airborne magnetic survey (760 m a.s.l) was undertaken in 1984 for the purpose of delineating the geothermal prospect. Detailed analysis of the aeromagnetic data shows that some residual total force magnetic anomalies are independent of terrain effects. Positive magnetic anomalies are probably due to young rhyolites whereas negative magnetic anomalies are due to hydrothermal alteration. A three dimensional (3-D) magnetic interpretation indicated that hydrothermally demagnetized rocks associated with Rotoma-Tikorangi geothermal prospect have variable thickness ranging between 800 and 1250 m and dip towards the north. The geothermal prospect is characterized by concealed outflow. The results of this study also suggest that the Rotoma-Tikorangi geothermal prospect extends further to the east of a resistivity boundary delineated from previous studies.

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