Tectono-Metamorphic Evolution of a High- to Medium-Grade Ductile Deformed Metagabbro/Metadiorite from the Arenosa Creek Shear Zone, Western Sierras Pampeanas, Argentina

CASTRO DE MACHUCA, BRÍGIDA; DELPINO, SERGIO; PREVILEY, LORENA; MOGESSIE, ABERRA; BJERG, ERNESTO

JOURNAL OF STRUCTURAL GEOLOGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2012 vol. 42 p. 261 - 278

0191-8141

Textural and compositional changes affecting a quartzose metagabbro/metadiorite in a ductile shear zone which is part of the Early Palaeozoic (Famatinian) orogenic belt of the Western Sierras Pampeanas, Argentina, allow reconstruction of its tectono-metamorphic evolution as well as the metamorphic conditions achieved. On the basis of paragenetic associations and microfabrics, three overprinted deformation events are differentiated: a) a relict ductile event developed within the granulite facies, at temperatures exceeding 800 °C and pressures