El metamorfismo de muy bajo grado en sedimentos permotriásicos de la Cordillera Ibérica oriental (sierras de Espina y Espadán, Castellón)

• Autores: Juan Diego Martín Martín, David Gómez-Gras, Teófilo Sanfeliu Montolío, David Parcerisa
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 8, 2005 (Ejemplar dedicado a: XV Congreso Nacional de Sedimentología y IV Coloquio de Estratigrafía y Paleogeografía del Pérmico y Triásico de España), págs. 197-199
• Idioma: inglés
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• Resumen

  • The central area of the western Iberian Chain (Espina and Espadán ranges) represents the depocentre of the permo-triassic rift basin and registers a sequences of red-beds up to 800-m-thick. The permo-triassic clay mineral assemblage is formed by illite pyrophyllite sudoite in the lower unit (Permian), and illite (95%) in the middle and upper units (Triassic). The existence of authigenic pyrophyllite indicates low-grade metamorphic conditions in that area of the Chain. These conditions are well correlated with the Kl mean value meassure in lutites and sandstones, and the development of slaty cleavage. The metamorphism is associated with the heat flow circulation along the extensive fault system inherited from hercynian times and reactivated during the alpine compression.