Along-strike variations of P-T conditions in accretionary wedges and syn-orogenic extension, the HP-LT Phyllite-Quartzite Nappe in Crete and the Peloponnese

作者：Jolivet Laurent^*; Trotet Fabien; Monie Patrick; Vidal Olivier; Goffe Bruno; Labrousse Loic; Agard Philippe; Ghorbal Bad'r

来源：Tectonophysics, 2010, 480(1-4): 133-148.

DOI：10.1016/j.tecto.2009.10.002

• High pressure and low temperature metamorphic rocks
• Exhumation
• Slab retreat
• Detachment
• Crete
• Peloponnese

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.

• 出版日期2010-1-5