Condiciones metamórficas de las metabasitas del Roc de Frausa (Pirineos Orientales)

• M. Navidad ^[1] ; M. Liesa ^[2] ; J. Carreras ^[3]
  1. [1] dpto. Petrología y Geoquímica. Fac. CC. Geológicas. UCM.
  2. [2] Departament de Geoquímica, Petrología i Prospecció Geologica. Univ. Barcelona
  3. [3] Departament de Geología. Univ. Autónoma de Barcelona.

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• Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 3, 1996, págs. 621-624
• Idioma: español
• Títulos paralelos:
  • Metamorphic conditions of the metabasites in the Roe de Frausa massif (Eastern Pyrenees)
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• Resumen

  • An approach to the metamorphic conditions based in mineral paragenesis of metabasites from different areas of Roe de Frausa Massif has been made. Regional peak metamorphism is showed by the metamorphic paragenesis in granulites conditions from Les IIles sector (Clpx + PI + Amph + !lm); P-T conditions during Hercynian metamorphism are 750 ± 20 ºC and 4.5 ± 0.5 Kb (18 -20 km) witch a geotermal gradient account betwen 39 - 42°C / km. A subsecuent retrograde metamorphism appear in low grade conditions 3.5 ± 0.5 Kb and 480 ± 20 ºC (14-16 km) wich a geotermal gradient betwen 31- 34 ºC / km. This retrograde metamorphism is showed in the Montalba sector by Gr - Amph - PI- 1/m paragenesis; their metamorphic conditions are 510 ±20°C and 4 Kb ( 16 Km) witch a geotermal gradient betwen 30 ± 2ºC / km.