High temperature - Low pressure tectonites from the Boa Fé Fault Zone (Évora Massif, Ossa Morena Zone, Portugal): Evidences for transtensional tectonics
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. Th...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2003 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | inglés |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/9052 |
| Acceso en línea: | http://hdl.handle.net/10272/9052 |
| Access Level: | acceso abierto |
| Palabra clave: | Ossa-Morena Zone Évora Massif Boa Fé Fault Zone FIT-LP tectonites Transtensional tectonics Zona de Ossa-Morena Macizo de Évora Zona de Falla de Boa Fé Tectonitas de alta temperatura y baja presión Tectónica transtensiva |
| Sumario: | 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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