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

By
S. Oriolo
S. Oriolo
1
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Intendente Güiraldes 2160, Buenos Aires, Argentina
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;
M. S. Japas
M. S. Japas
2
Instituto de Geociencias Básicas, Aplicadas y Ambientales (CONICET-UBA), Intendente Güiraldes 2160, Buenos Aires, Argentina
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;
E. O. Cristallini
E. O. Cristallini
3
Laboratorio de Modelado Geológico, IDEAN (UBA-CONICET), Intendente Güiraldes 2160, Buenos Aires, Argentina
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;
M. Giménez
M. Giménez
4
Instituto Geofísico Sismológico Volponi, FCEN, Universidad Nacional de San Juan, Av. José Ignacio de la Roza y Meglioli S/N, San Juan, Argentina
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Published:
January 01, 2014

Abstract

Detailed structural, kinematic and geophysical data on the foreland of the Pampean flat-slab segment (Hualilán 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.

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Geological Society, London, Special Publications

Deformation Structures and Processes within the Continental Crust

S. Llana-Fúnez
S. Llana-Fúnez
Universidad de Oviedo, Spain
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;
A. Marcos
A. Marcos
Universidad de Oviedo, Spain
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;
F. Bastida
F. Bastida
Universidad de Oviedo, Spain
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Geological Society of London
Volume
394
ISBN electronic:
9781862396708
Publication date:
January 01, 2014

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