Phase equilibria and geochronology of Ossa-Morena eclogites

• Author(s): Moita, Patricia ; Munhá, José ; Fonseca, Paulo ; Pedro, Jorge ; Araújo, Alexandre ; Tassinari, Colombo ; Palacios, Teresa
• Date: 2005
• Persistent ID: http://hdl.handle.net/10174/2299
• Origin: Repositório Científico da Universidade de Évora
• Subject(s): Eclogites; Ossa-Morena Zone
• Document Type: Lecture
• Language: English

Description

The mineralogical evolution of OMZ eclogites was modelled by calculated P-T pseudosection analysis for an appropriate bulk composition in the model system CNFMASH. OMZ eclogites having developed a clockwise P-T path that reached 16-18 kbar and 600-650 ºC, underwent isothermal decompression to 12-10 kbar before final cooling (< 550 ºC) to greenschist facies conditions. Sm/Nd and Ar/Ar radiometric data indicate that the OMZ eclogite facies metamorphism took place at ~370 Ma, being followed shortly afterwards by exhumation during (D1) nappe emplacement.