Abstract
Intense deformation of the rocks in the lower crust is a common feature of regional metamorphic terrain. The conversion of some mechanical energy to thermal energy by strain-heating may make a significant contribution to the thermal regime. This strain-heating contribution is studied by the development of a single-layer viscous fold model that couples the effects of strain-heating with folding. The results indicate that the temperature rise from strain-heating shows a linear increase for the initial period of folding, but at later times the bending effect of folding begins to dominate the strain-heating and an exponential temperature rise with time is experienced. In addition, strain-heating effects are increased if the viscosity contrast of the layers is increased. The results suggest that in a continental region thermal temperature increases between 25 to 100°C might be achieved assuming reasonable conditions during deformation of a regional metamorphic terrain.
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