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Thermal structure of active thrust belts
Author(s) -
KARABINOS P.,
KETCHAM R.
Publication year - 1988
Publication title -
journal of metamorphic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.639
H-Index - 114
eISSN - 1525-1314
pISSN - 0263-4929
DOI - 10.1111/j.1525-1314.1988.tb00440.x
Subject(s) - thrust , geology , metamorphism , thermal conduction , displacement (psychology) , deformation (meteorology) , heat transfer , front (military) , electrical conductor , thermal , geotechnical engineering , mechanics , petrology , thermodynamics , materials science , composite material , psychology , oceanography , physics , psychotherapist
In order to study the thermal structure of active thrust belts, we have developed a numerical model of conductive heat transfer between thrust sheets during deformation. Our finite difference approach alternates small, instantaneous increments of displacement and isotherm translation with conductive relaxation of perturbed isotherms. In each step, conduction occurs for a length of time equal to the displacement increment divided by the thrust velocity. Computer simulations demonstrate that conductive heat transfer is significant during deformation and that temperatures in hanging‐wall rocks decrease while temperatures in foot‐wall rocks increase over distances of up to 10 km from the thrust surface. When the effects of internal heat production are also calculated, heating of foot‐wall rocks exceeds cooling of hanging‐wall rocks. Rocks located between two thrusts may experience a complicated temperature–time path of early heating followed by cooling. These models help to explain the rapid metamorphism of rocks in the Taconian thrust belt in the northern Appalachians of New England soon after deposition of the youngest sediments.