INVESTIGADORES
RAPALINI Augusto Ernesto
congresos y reuniones científicas
Título:
PERMO-TRIASSIC COLLISION OF PATAGONIA? PALEOMAGNETIC EVIDENCE
Autor/es:
LUPPO, TOMÁS; RAPALINI, AUGUSTO E.; MARTINEZ DOPICO, CARMEN; LOPEZ DE LUCHI, MÓNICA
Lugar:
Querétaro
Reunión:
Congreso; LatinMag 2017; 2017
Institución organizadora:
Asociación Latinoamericana de Paleomagnetismo y Geomagnetismo
Resumen:
Two paleomagnetic poles from magmatic rocks of the Permo-Triassic La Esperanza Plutono-VolcanicComplex in northern Patagonia show significantly different positions. A paleomagnetic study on the CollinaoDacite, dated as 253 Ma, yielded a pole that is anomalous with respect to the Gondwana Late Paleozoicapparent polar wander path, falling within the Late Carboniferous (340-300 Ma) reference poles. On theother hand, a pole computed for acidic dykes of 244 Ma is consistent with Early Triassic (250-240 Ma)reference poles for Gondwana. A model proposing a ca. 30° counterclockwise (ccw) rotation of the NorthPatagonian Massif in such lapse as final stages of collision of Patagonia against the Gondwana margin,closing a small V-shaped oceanic (?) basin, may explain the paleomagnetic evidence and is consistent withdifferent geological evidence
