Abstract

PAUCAR-AYALA, Stalyn David; ORTIZ-MUNOZ, Deymi Jhoel; SOLANO-YEPEZ, Stalin Paul  and  VITERI-SANTAMARIA, Francisco Rigoberto. Evidencias de metamorfismo retrógrado en el Complejo Metamórfico El Oro. Figempa [online]. 2023, vol.15, n.1, pp.45-55. ISSN 2602-8484.  https://doi.org/10.29166/revfig.v15i1.4227.

The El Oro Metamorphic Complex, located in southwestern Ecuador, consists of different low- and high-grade metamorphic rocks. The evidence of retrograde metamorphism is studied through the bibliographic review, especially, of the results obtained in the El Oro Metamorphic Complex (1990-1993) as part of the Cordillera Real Project (1986-1993) and other recent papers. Evidence of retrograde metamorphism has been mentioned in the Quebrada Plata Unit from amphibolite to green schists facies and in the Raspas ophiolitic complex from eclogite to blue schists. In addition, petrographic evidence of retrograde metamorphism has been obtained in an eclogite block from La Chilca Unit. Also, retrograde metamorphism is described regarding the evolution of the metamorphic complex (Quebrada Plata Unit), the exhumation processes, associated geological structures and mineral reactions.

Keywords : El Oro; eclogite-green-schists; retrograde metamorphism; exhumation; shear zone.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )