Journal
TECTONOPHYSICS
Volume 480, Issue 1-4, Pages 133-148Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2009.10.002
Keywords
High pressure and low temperature metamorphic rocks; Exhumation; Slab retreat; Detachment; Crete; Peloponnese
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Syn-orogenic detachments in accretionary wedges make the exhumation of high-pressure and low-temperature metamorphic rocks possible with little erosion. The velocity of exhumation within the subduction channel or the accretionary complex, and thus the shape of P-T paths, depend upon the kinematic boundary conditions. A component of slab retreat tends to open the channel and facilitates the exhumation. We document the effect of slab retreat on the shape of P-T paths using the example of the Phyllite-Quartzite Nappe that has been exhumed below the Cretan syn-orogenic detachment during the Miocene in Crete and the Peloponnese. Data show a clear tendency toward colder conditions at peak pressure and during exhumation where the intensity of slab retreat is larger. This spatial evolution of P-T gradient is accompanied with an evolution from a partly coaxial regime below the Peloponnese section of the detachment toward a clearly non-coaxial regime in Crete. (c) 2009 Elsevier B.V. All rights reserved.
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