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6897631 
Journal Article 
Transposed high-pressure granulite fabrics (Cabo Ortegal, NW Spain): Implications on the scales of deformation localization 
Puelles, P; Ábalos, B; Gil Ibarguchi, JI; , 
2009 
Yes 
Journal of Structural Geology
ISSN: 0191-8141 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
31 
8 
776-790 
English 
WOS:000269097300003 
High-pressure granulite facies rocks of the Bacariza Formation (Cabo Ortegal, NW Spain) were syn-metamorphically deformed at the contacts with the bounding units (peridotite and eclogite massifs). This enabled the formation of meter-thick, spectacular shear zones with reworked and transposed foliations and lineations. The texturally stable mineral assemblage of the new fabrics records an intense, ductile deformation of the mineral aggregate at temperatures of 700-800 degrees C associated with amalgamation of eclogite, high-pressure granulitic rocks and ultramafic sheets in deep portions of a subduction channel. The lattice preferred orientation of the main constituent minerals (garnet, augite, amphibole, plagioclase, quartz and biotite) discloses the active deformation mechanisms at the scale of the mineral grains and the relationships with the deformation at larger scales. Overprinting relationships of the metamorphic assemblages demonstrates that partitioning and deformation localization occurred at different scales under similar high-grade conditions. Complete macroscopic transposition in the shear zones was complementary to meso and microscopic partitioning of deformation intensity and mechanisms between different lithological layers and mineral species. (C) 2009 Elsevier Ltd. All rights reserved. 
Ductile shear zones; Deformation mechanisms; Localization; Transposition; EBSD; Cabo Ortegal; NW Spain 
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