High temperature - Low pressure tectonites from the Boa Fé Fault Zone (Évora Massif, Ossa Morena Zone, Portugal): Evidences for transtensional tectonics
Tectonitas de Alta Temperatura-Baja Presión en la Zona de Falla de Boa Fé (Macizo de Évora, Zona de Ossa-Morena, Portugal): Evidencias de una Tectónica Transtensional
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Publication Date
2003 -
Publisher
Sociedad Geológica de España -
Abstract
Partial melting in the Évora Massif (Ossa-Morena Zone) occurred contemporaneously with non-coaxial deformation in a transcurrent regime. An example of this fact has been taken from studied partially melted biotite-sillimanite-K-feldspar-andalusite-cordierite tectonites from the Boa Fé Fault Zone. These HT-LP (~ 2.5-3.5 kbarand 550°-750°C) mylonitic rocks characterized by a steeply dipping to SW foliation (N30°-55°W, 70°-80°SW) and gently dipping to SE stretching Uneation (10°-20° to SE) associated to sinistrai sense of movement. Transtensional tectonics is suggested to explain how the Évora High-grade Metamorphic Terrain migmatites were exhumed in parallelism with the orogen-trend
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