Evolución mieroestructural y metamórfica de la zona de cizalla extensional de Berzosa-Riaza: la superposición de asociaciones minerales de Baja-P/Alta-T sobre una secuencia Barroviense.

• Escuder Viruete, J. ^[2] ; Hernaiz Huerta, P.P. ^[2] ; Valverde-Vaquero, P. ^[3] ; Rodríguez Fernández, R. ^[1] ; Dunning, G. ^[3]
  1. [1] Instituto Geológico y Minero de España

     Instituto Geológico y Minero de España

     Madrid, España

     
  2. [2] Inypsa, España
  3. [3] Memorial University, Canadá

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• Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 4, 1996 (Ejemplar dedicado a: Comunicaciones presentadas en el IV Congreso Nacional de Geología, Alcalá de Henares, 1996), págs. 879-882
• Idioma: español
• Títulos paralelos:
  • Microestructural and metamorphic evolution of the extensional Berzosa-Riaza shear zone: the overprint of lower-P/High-T mineral assemblages over a Barrovian sequence
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• Resumen

  • A new integrated analysis of microstructural, metamorphic and U-Pb monazite age data, indicates that the Berzosa-Riaza shear zone (BRSZ) is a major D2 extensional structure associated with crustal-scale ductile extensional shearing and important decompression. Low-P/high-T metamorphism associated with thw D2 event overprints earlier barrovian metamorphic assemblages formedduring the Hercynian D1 compressional event. Qualitatively-derived P-T-t paths suggest that this syncollisional extension in the Somosierra sector of the Spanish Central System was associated with the major extensional collapse of the previously thickened Hercynian crust.