Phase equilibria and geochronology of Ossa-Morena eclogites

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...

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Bibliographic Details
Main Author: Moita, Patricia (author)
Other Authors: Munhá, José (author), Fonseca, Paulo (author), Pedro, Jorge (author), Araújo, Alexandre (author), Tassinari, Colombo (author), Palacios, Teresa (author)
Format: lecture
Language:eng
Published: 2010
Subjects:
Eclogites
Ossa-Morena Zone
Online Access:http://hdl.handle.net/10174/2299
Country:Portugal
Oai:oai:dspace.uevora.pt:10174/2299
Description
Summary: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.

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