Abstract
The effect of crustal melt on extension in the central Taupo Volcanic Zone, New Zealand is investigated using a 3D numerical model of rifting. Partial melt bodies are directly inferred from magnetotelluric imaging, and are used to determine heat flow and crustal viscosity in the rift. We show how the pattern and narrow width of active faulting in the modern Taupo Rift and the change in fault strike south of the Okataina Volcanic Centre can be partly explained by the thermal weakening effects of partial melt at depth.
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