Emplazamiento, petrología y composición mineral de los basaltos alcalinos del Pérmico Superior del sector de Anayet (Pirineo central, Huesca)

• Autores: Carlos Galé Bornao, Marceliano Lago San José, Enrique Arranz Yagüe, Andrés Gil Imaz, Andrés Pocoví Juan
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 45-48
• Idioma: español
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• Resumen

  • Severa/ basaltic sills of subalkaline-to-alkaline affinity are interbedded within the Upper Permian sedimentary rocks of the Anayet area (Huesca). The mineral assemblage is composed mainly of clinopyroxene (Ti-rich augite) and plagioclase. Their respective crystallization temperatures are 900-700gC and 1066-1027-C. This magmatism represents the transition from a compressive post-orogenic regime (characterised by the Lower Permian calc-alkaline magmatism) to an extensional tectonic regime (expressed later by the Triassic tholeiitic magmatism).