A Silurian regional tectonometamorphic event has been widely recorded by different geochronological methods in the Sierras Pampeanas, NW Argentina and Precordillera. It took place between ca. 445 420 Ma after Hirnantian (late Ordovician) glaciogenic sedimentation. Three domains are recognized. 1) The eastern Pampeanas Puna mainly record focused westward ductile thrusting heating. 2) In westernm...

The 495 to 450 Ma Famatinian orogen, exposed throughout central and northwestern Argentina, formed from east-directed subduction under the Gondwanan margin. Sierra de Narváez Las Planchadas preserve a rare upper-crustal section of arc. New mapping, structural analysis, detrital U–Pb zircon geochronology, as well major trace element geochemistry in – are presented give comprehensive geodynamic p...