REINTERPRETATION OF THE ORDOVICIAN ROTATIONS FOUND IN NW ARGENTINA AND NORTHERN CHILE: A CONSEQUENCE OF THE PRECORDILLERA COLLISION?

SPAGNUOLO, CECILIA M.; RAPALINI, AUGUSTO E.; ASTINI, RICARDO A.

Isla Margarita, Venenzuela

Congreso; LatinMag 2009; 2009

LatinMag (Latin American Association of Geomagnetism and Paleomagnetism)

Systematic Early Paleozoic rotations have long been detected in Northwesterna Argentina and Northern Chile. They are characterized by large clockwise rotations in the Famatina and Eastern Puna systems of Argentina and counterclockwise in the western Puna of Argentina and Chile. These rotations have been previously interpreted acccording to different tectonic models, but none has yet related both rotation patterns. A new model is proposed that assign these rotations, that occurred in the Late Ordovician, to escape tectonics associated to the collision of the Laurentian Precordillera (or Cuyania) terrane to the southwestern Gondwana margin