Abstract

Quantitative modeling of metamorphic P-T-t paths in thrust belts has so far been limited to one-dimensional simplification. We have developed a two-dimensional time-dependent finite-element procedure, capable of tracing and updating fault and strata boundaries during faulting, for modeling thermal evolution of overthrust terrains. We show that the two-dimensionality of an overthrust and the speed and duration of thrusting have significant effects on the P-T-t paths of rocks in orogenic belts. The results suggest that petrological studies of P-T paths of rocks from different lateral positions in an orogenic belt, along with two-dimensional modeling procedure, can put strong constraints on models of regional tectonic processes.

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