Termobarometría núcleo-borde en granates con zonado difusionalEl ejemplo del Domo Gneísico del Tormes, NO de Salamanca
- J. Escuder Viruete 1
- A. lndares 2
- R. Arenas 3
- 1 Dpto. de Ciencias de la Tierra, Universidad de Zaragoza
- 2 Dep. of Earth Sciences, Memorial Universityof Newfoundland, St.John's, NF, Ganada
- 3 Depto. de Petrología y Geoquímica,Universidad Complutense, Madrid
ISSN: 0213-683X
Año de publicación: 1996
Número: 20
Páginas: 617-620
Tipo: Artículo
Otras publicaciones en: Geogaceta
Resumen
Metapelites and acid orthogneisses from the Lower Unit of the Tormes Gneissic Dome, NW Salamanca, contain high-grade mineral assemblages with characteristics diffusional zoned garnets, The P-T path deduced for this unit from combined studies based on TWEEQU thermobarometry in core-rim garnets, retrograde reaction analysis and mineral zoning, shows an important isothermal decompression of severa/ kilobars. This decompression is the record of the tectonic exhumation of the unit, caused by a 02 extensiona/ event related with the collapse of the previously thickened Variscan crust.