| Abstract |
Six published conceptual models of the TVZ (Taupo Volcanic Zone) are reviewed, and comparedagainst fourteenknown or inferred physical propertiesof the TVZ. A model of three layers, each with constant density, is assumed to eventually develop above a depth of 25 A constant rate of eruption of material was assumed, which eventually implies a constant rate of spreading,and a constant rate of volumetric creation in all three layers. Heat flow calculations are performed, by assuming conductive heat transport below 8 km and above Layer 3, and intrusiveheat sources below Layer 1and above 8 km. Some examplesare providedwhich match the present total heat outputfromtheTVZof about4200 but these either have spreading rates greater than the low values of about 8 4 being reported from GPS measurements, or else consider extension rates in the TVZ to have varied over time. |