IGEBA 23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Propiedades magnéticas de xenolitos en la trondhjemita El Hongo (Cámbrico), provincia de Córdoba, Argentina
Autor/es:
GEUNA, S. E.; ESCOSTEGUY, L.D.; DÍAZ APPELLA, B.; D´ERAMO, F.; PINOTTI, L.
Reunión:
Congreso; Cuarta Reunión Bienal - Latinmag 2015; 2015
Resumen:
Two xenoliths included in the Cambrian El Hongo trondhjemite, composed of biotite-tonalite gneiss, were studied. They both have magnetic susceptibility significantly higher than that of wall rocks, due to the presence of magnetite. Magnetite appears with ilmenohematite in one of the xenoliths, but with hemoilmenite and pyrite in the other one. The surrounding igneous rock shows the same assemblage in each case, though magnetite appears martitized, while rhombohedral oxide is fresh. A demagnetized halo is observed around one of the xenoliths, which we interpreted as due to a magnetite-destructive reaction to form titanite. The importance of wall rocks as control of the oxide assemblages in different areas of the igneous rock is discussed.
