Relevamiento Geofísico del Lago Yehuin. Andes Fueguinos. Argentina

LOZANO, JORGE GABRIEL; BRAN, DONALDO MAURICIO; CERREDO, MARIA ELENA; TASSONE, ALEJANDRO

San Miguel de Tucumán

Congreso; XX Congreso Geológico Argentino; 2017

AGA

Geophysical survey of Lago Yehuin: Fuegian Andes: Argentina. Lago Yehuin occupies a compartmented structural depression originated along a segment of the left-lateral strike slip Lago Deseado fault system. TI1is work deals with the first geophysical survey performed within the Jake. New acquired high-resolution single-channel  seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to present a bathymetric map, reconstruct the basement surface of the Jake, and the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin, both limited by a set ofnonnal faults of medium to high angle, which overprint NE-vergent thrusts. Three seismostratigraphic units have been interpreted in the seismic records. The Lago Yehuin is considered a Neogene strike slip basin that was later affected by glacial and glacio-lacustrine depositional events. Interpreted submerged ridge moraines within Lago Yehuin correlated with onland moraine arcs allowed to complete recessional paths of Fuego and Ewan ice lobes. Strong structural control is proposed not only for Lago Yehuin formation but also for the general routes of the northern diffiuents of Fagnano palaeoglacier.