INVESTIGADORES
GUERESCHI Alina Beatriz
congresos y reuniones científicas
Título:
Epidoto cromífero en un skarn de granate-piroxeno en Los Guindos, Pampa de Olaen, Córdoba
Autor/es:
ESPECHE, MARÍA JOSÉ; LIRA, RAÚL; GUERESCHI, ALINA BEATRIZ
Lugar:
Córdoba
Reunión:
Congreso; XIII Congreso de Mineralogía, Petrología Ígnea y Metamórfica, y Metalogénesis (XIII MINMET-IV PIMMA); 2019
Institución organizadora:
Asociación Mineralógica Argentina y Comisión de Petrología (COMPETRO) de la Asociación Geológica Argentina
Resumen:
Chromium-rich epidote is reported for the first time in Argentina. It occurs in a garnet-clinopyroxene skarn at Los Guindos, Pampa de Olaen, Córdoba. Microprobe analysis yielded Cr2O3 contents that vary between 0.06 and 7.4 wt. % (0.004 and 0.472 a.p.f.u, respectively) in retrograde anhedral epidote. Epidote grew after the replacement of a clinopyroxene crystal starting from its intergranular contact with a zincochromite crystal inclusion, and from the fractures and cleavages of clinopyroxene (sample Ep1). Minor contents of Cr2O3 up to 0.75 wt. % (0.047 a.p.f.u.) were recorded in anhedral epidote grains with irregular zonation associated with the retrograde stage (actinolite-potassium feldspar-chlorite-quartz-calcite) of a pyroxene scheelite-bearing skarn (sample Ep2).
