INGEIS 05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
artículos
Título:
PERMO-TRIASSIC COLLISION OF PATAGONIA? PALEOMAGNETIC EVIDENCE
Autor/es:
LÓPEZ DE LUCHI, M.G.; LUPPO, T.; FANNING, C. M.; MARTÍNEZ DOPICO, C.I.; MIGUEZ, M.; RAPALINI, A.E.
Revista:
LatinMag Letters
Editorial:
Universidad Nacional Autónoma de México
Referencias:
Año: 2017 vol. 7 p. 1 - 5
ISSN:
2007-9656
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.
