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Ngawha geothermal field

, : Ngawha geothermal field. Monograph Series on Mineral Deposits 26(Pages 185-192

Ngawha is the only high temperature geothermal system in New Zealand that is not within the Taupo Volcanic zone, it being some 400 km further to the north (Fig.16.1). The geologic environment of the system is quite different from those in the Taupo Volcanic Zone, since it is hosted by greywackes and capped by marine sediments rather than silicic volcanics. The surface expression of the system is small, with little emerging hot water, but numerous gas and steam seeps occurring over a large area. Exploration for geothermal energy developments has resulted in 14 deep ( 500 m) wells being drilled in the field, 13 of these since 1978. Exploitation of the energy has been deferred primarily because the enthalpy of the fluid produced to date has been relatively low ( nearly equal 1000 kJ/kg).


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