Patagonia: un terreno alóctono acrecionado al Gondwana Occidental y su contribución a la formación de los paleo-Andes en el Paleozoico superior

RAMOS, V.A.; NAIPAUER MAXIMILIANO

Oviedo

Congreso; VIII Congreso Geológico de España; 2012

Sociedad Geológica de España

New paleontological findings and new geochronological data have revealed the origin of the Patagonia as an allochthonous continent originated in the Eastern Gondwana in the early Paleozoic, which has been accreted to the Western Gondwana in the late Paleozoic. The discovery of archeocyathids of Early Cambrian age in conglomerates and breccias in Ordovician successions, together with clasts of calc-alkaline volcanic rocks, allowed correlating the origin of these sequences in the Trasantarctic Mountains of Eastern Antarctica. On the other hand the composition and age of their detrital zircons admit a better correlation with sectors of these mountains, identifying their potential source areas in this continent. The detachment of Patagonia in the Silurian-Devonian from the Eastern Gondwana marked the beginning of the travelling and later accretion to the Western Gondwana in the Early Permian, culminating with the development of the Gondwanides, a key mountain chain in the reconstruction of the Neopaleozoic paleo-Andes in southern Argentina and Chile.