Aeromagnetic Survey At Mokapu Penninsula Area (Thomas, 1986)
From Open Energy Information
Exploration Activity: Aeromagnetic Survey At Mokapu Penninsula Area (Thomas, 1986)
A separate geophysical analysis performed on the Koolau caldera area (Kauahikaua, 1981 a) synthesized existing self-potential, gravity, seismic and aeromagnetic data with recently acquired resistivity soundings. An analysis of the observed remnant magnetization within the caldera complex suggested that subsurface temperatures ranged from less than 300degrees C to no more than 540degrees C. The resistivity data indicated that the electrical basement, to a depth of 900 m, had resistivities ranging from 42 ohm.m to more than 1000 ohm.m, which is considered to be within the expected range for basalts (or alteration suites) saturated by cold, fresh to saline water. No substantial effects on the resistivities were observed that were interpreted to be due to thermal influences. In the light of the geophysical data just reviewed, it may be assumed that if a thermal resource is associated with the Koolau caldera, its temperature is probably very low.
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