
handle: 11336/149079
Mylonite with a big delta mantled porphyroclast of K-feldspar in a matrix of quartz, mica and feldspar. Mylonite is derived from a porphyritic granite characterized by large K-feldspar phenocrysts (up to 20 cm long). Medium-grade conditions can be inferred from the recrystallization of K-feldspar along the rims of porphyroclast. Shear sense is dextral as indicated by the stair stepping to the right across the delta structure. Section subparallel to the lineation and normal to the foliation. Width of view 154 mm. Location: Sierra de Velasco, La Rioja Province, NW Argentina; GPS point (WGS84): S 28°36′26.2″ - W 67°10′38.5″; Rock type: Mylonite; Formation name: Ortogneiss Antinaco (TIPA Shear Zone); Age (relative): Post-Lower Ordovician / Pre-Carboniferous; Facies/grade: medium grade.
Fil: Larrovere, Mariano Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
https://purl.org/becyt/ford/1.5, PORPHYROCLAST, https://purl.org/becyt/ford/1, DUCTILE SHEAR ZONES, SIERRA DE VELASCO
https://purl.org/becyt/ford/1.5, PORPHYROCLAST, https://purl.org/becyt/ford/1, DUCTILE SHEAR ZONES, SIERRA DE VELASCO
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