ESTUDIO DE ROTACIONES TECTÓNICAS EN LA ZONA DE TRANSICIÓN ENTRE LOS ANDES CENTRALES Y LOS ANDES PATAGÓNICOS: UN REPORTE PALEOMAGNÉTICO PRELIMINAR

RE, GUILLERMO; FOLGUERA, ANDRÉS; FRANCESCHINIS, PABLO R.; RAPALINI, AUGUSTO E.; MILANESE, FLORENCIA N.; FEO, RODRIGO

Congreso; Latinmag 2019; 2019

Asociación Latinoamericana de Paleomagnetismo y Geomagnetismo

The transition zone between the southern Central Andes and the northern Patagonian Andes is located ataround 36.5° S-38° S in the northern section of the Neuquén Cordillera and shows a complex patternof Neogene to Quaternary deformation. A systematic paleomagnetic study on Cenozoic volcanic unitsexposed in the region is undergoing with the aim of localizing and quantifying possible vertical axistectonic rotations as part of the Andean deformation of the region. Sixty- five sites on Eocene toPleistocene basaltic to andesitic flows have already been collected at several localities and are currentlybeing analyzed. Preliminary results show that Eocene lavas at El Huecú are un-rotated while indicatingover 20° of counterclockwise rotation near El Moncol. Comparison with areas located to the south andclose to the Liquiñe-Ofqui fault zone, in which very large rotations have been found, will permit a moreprecise characterization of the Andean deformation of the studied region.