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Temperature gradients have been measured in 44 drillholes within the North Island volcanic belt. New Zealand, and in 4 further holes adjacent to this region. Temperature gradients ranged widely from zero, or slightly negative values to +815°c/km. This variation is attributed to the existence of convective hydrothermal systems within the volcanic belt. Heat flow values for five drillholes for which adequate lithologic data were available ranged from 28 to 113 mW 1m'.

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