publication . Article . 2011

Olivine fabric and deformation conditions of the ultramafic rocks in the Herbeira Massif (Cape Ortegal NW Iberian Massif)

García Izquierdo, Beatriz; Capote, Ramón; Lunar, Rosario;
Open Access Spanish
  • Published: 01 Jan 2011
  • Publisher: Sociedad Geológica de España
  • Country: Spain
Abstract
[EN] The Herbeira ultramafic massif is located in the structural upper portions of the Cabo Ortegal Variscan Complex, NW Galicia, which form part of a thrust sheet that shows a complex deformational evolution. An important strike-slip fault, the Trans Herbeira Fault, divides the massif into two different zones. The eastern one is composed of amphibole bearing harzburgites, whilst the western one has a more complete lithological succession: basal harzburgite, lower dunite, medium pyroxenite and upper dunite. Equigranular and porphyroclastic microfabrics are observed in these rocks under optical microscope and SEM, providing evidence of a succession of several tec...
Subjects
free text keywords: Mineralogía, Peridotite, petrofabrics, olivine, paleopiezometry, stress, mantle, Peridotita, fábrica, olivino, deformación, paleopiezometría, esfuerzo, manto
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