Metapelitas de alta presión de la Unidad de Santiago (Complejo de Ordenes, NO del Macizo Ibérico).

• Autores: Francisco J. Rubio Pascual, Ricardo Arenas Martín, Florentino Díaz García
• Localización: Geogaceta, ISSN 0213-683X, Nº. 13, 1992, págs. 101-105
• Idioma: español
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• Resumen

  • A high - pressure - low - to intermediate temperature eo - Hercynian metamorphic event characterizes the tectonothermal evolution of the Santiago Unit, in the western margin of the Ordenes Complex. P-T conditions fo r the mineral assemblages of the high - pressure event (which is essentially preserved as a very thin Si=S1 included in albite porphyroblasts in semipelitic schists) have been estimated at 493 ± 9 °C and 14.7 ± 0.7 kbar (minimum pressure). The development of the high - pressure metamorphism and the lacking of significative reequilibrium of their characteristic mineralogy, suggests that the unit (probably a fragment o f the continental margin of Condwana) has been uplifted inm ediately after undergoing subduction in the beginning of the Hercynian Orogeny