Jaillard Etienne. (1994). Kimmeridgian to Paleocene tectonic and geodynamic evolution of the Peruvian (and Ecuadorian) margin. In :
Salfity J.A. (ed.). Cretaceous tectonics of the Andes. Braunschweig : Vieweg, p. 101-167. (Earth Evolution Sciences). ISBN 3-528-06613-X.
Titre du document
Kimmeridgian to Paleocene tectonic and geodynamic evolution of the Peruvian (and Ecuadorian) margin
Année de publication
1994
Type de document
Partie d'ouvrage
Auteurs
Jaillard Etienne
In
Salfity J.A. (ed.), Cretaceous tectonics of the Andes
Source
Braunschweig : Vieweg, 1994,
p. 101-167 (Earth Evolution Sciences). ISBN 3-528-06613-X
Three main tectonic periods are recognized between Kimmeridgian and Paleocene times in the Peruvian-Ecuadorian margin. The "Viru" period comprises a Kimmeridgian event probably equivalent to the Araucan phase of Argentina and Chile, a Tithonian phase related to terrane accretions and collision tectonics along the Ecuadorian margin and to a sudden extension along the north Peruvian margin, and a Berriasian event most probably originated by the incipient South Atlantic rifting. The "Mochica" period begins with tensional and volcanic precursor events (Late Aptian-earliest Albian). It continues with extensional effusions of coastal, back-arc or arc volcanic centres, which alternate with compressive crises (Early and Middle Albian). It ends with the accretion and deformation (thrusting ?) of the Albian volcanic arc or back-arc volcanic system (Late Albian-Early Middle Cenomanian). The "Peruvian" phase starts with a paleogeographic change probably triggered by the incipient coastal uplift (Turonian-Coniacian boundary), and continues in the Late Coniacian-Early Santonian with the initiation of northeastward overthrusts located in the southwestern boundary of the western Trough. It culminates in the latest Campanian, with the creation of intermontane basis which express the onset of the southwestern thrusts, and of foreland basins related to the onset of new overthrusts located in the northeastern boundary of the western Trough. An extensional regime was prbably dominant during the latest Jurassic and Early Cretaceous times, leading to formation of the main sedimentary basins, with an apparent quiescence of the subduction-related volcanic systems... (D'après résumé d'auteur)
