Evolución metamórfica hercínica de la región de Segovia (Sierra de Guadarrama)

1. R. Arenas ¹
2. J.M. Fúster ¹
3. F. González Lodeiro ²
4. J. Macaya ³
5. L.M. Martín Parra ⁴
6. J.R. Martínez Catalán ³
7. C. Villaseca ¹

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Altres publicacions en: Revista de la Sociedad Geológica de España

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One of the deepest sectors of the Sierra de Guadarrama outcrops in the area around Segovia, where the Hercynian regional metamorphism reached high intensity. The tectonometamorphic evolution of the area is very similar to that considered as tipical of middle crustal levels in orogenic belts characterized by a strongly thickened crust. A first prograde stage of intermediate P/T (M1), coeval with nappe tectonics, was followed by a decbmpressive paroxysmal stage (M2) and, finally, by a last retrograde stage (M3). The metamorphic peak conditions reached the high temperature part of the amphibolite facies. Breaking down of moscovite in pelitic and quartzfeldspatic rocks led to the development of an orthoclase - sillimanite zone, inside of which all the studied area around Segovia is included. Subgranoblastic textures with sharp grain boundaries were developed in metabasic rocks during the thermal peak conditions. In these, coexistence of hornblende, diopsidic clinopyroxene and plagioclase indicate the same conditions for the metamorphic peak.

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