Cross-strike structures controlling magmatism emplacement in a flat-slab setting (Precordillera, Central Andes of Argentina)

ORIOLO, SEBASTIÁN; JAPAS, SILVIA; CRISTALLINI, ERNESTO; GIMENEZ, MARIO

Deformation Structures and Processes within the Continental Crust

The Geological Society

Lugar: Londres; Año: 2014; p. 113 - 127

Detailed structural, kinematic and geophysical data on the foreland of the Pampean flatslab segment (Hualila´n area, Andean Precordillera of Argentina) have shown that cross-strike structures have had an important role in the evolution of this Andean segment since Miocene times. These structures represent pre-existing crustal fabrics reactivated during the Andean orogeny and could have controlled the emplacement of the Miocene arc-magmatism migrating into foreland due to the flattening of the slab. Likewise, kinematic results obtained for these structures support a similar stress frame to that obtained elsewhere in the Precordillera but showing different motions as a consequence of their high obliquity to the orogen trend. Moreover, they record a reorientation of kinematic axes during Late Miocene?Pliocene times.