Crystal preferred orientation of olivine in mantle xenoliths from Catalonia (NE Spain)

© 2016 Universidad de Oviedo. All rights reserved. Mantle xenoliths in Neogene-Quaternary alkaline volcanic rocks from the Catalan Volcanic Zone indicate that «anhydrous» spinel lherzolites, harzburgites and much subordinate olivine websterites form the lithospheric mantle of NE Iberian Peninsula. Olivine crystal preferred orientation, determined by indexation of electron-backscattered diffraction patterns, provides three types of deformation fabric: a dominant [010]-fiber type in peridotites and websterites equilibrated at high temperature, and subordinate orthorhombic and [100]-fiber types, which appear mostly in porphyroclastic and equigranular lherzolites equilibrated at lower temperature.