Paleogene clockwise tectonic rotations in the forearc of central Andes, Antofagasta region, northern Chile - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2003

Paleogene clockwise tectonic rotations in the forearc of central Andes, Antofagasta region, northern Chile

César Arriagada
  • Fonction : Auteur
Pierrick Roperch
Constantino Mpodozis
  • Fonction : Auteur
Peter Cobbold
  • Fonction : Auteur
Annick Chauvin
  • Fonction : Auteur
Joaquin Cortés
  • Fonction : Auteur

Résumé

[1] For the Central Valley of northern Chile (Antofagasta region), a paleomagnetic analysis of data from 108 sites, mainly in Mesozoic and Paleogene volcanic rocks, has yielded stable remanent magnetization directions for 86 sites. From these data, we infer clockwise tectonic rotations of up to 65°within the forearc domain of the central Andes. The apparent relationship between tectonic rotations and structural trends suggests that rotations occurred mainly during the Incaic orogenic event of Eocene-early Oligocene age. A few paleomagnetic results obtained in Neogene rocks do not show evidence of clockwise rotations. Hence the development of the Bolivian orocline during late Neogene time cannot be explained by simple bending of the whole margin. These results demonstrate that tectonic rotations within the forearc and pre-Cordillera are key elements of early Andean deformation, which should be taken into account by kinematic models of mountain building in the central Andes.
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hal-02957158 , version 1 (05-10-2020)

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César Arriagada, Pierrick Roperch, Constantino Mpodozis, Guillaume Dupont-Nivet, Peter Cobbold, et al.. Paleogene clockwise tectonic rotations in the forearc of central Andes, Antofagasta region, northern Chile. Journal of Geophysical Research : Solid Earth, 2003, 108 (B1), ⟨10.1029/2001JB001598⟩. ⟨hal-02957158⟩
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