INVESTIGADORES
PETRINOVIC Ivan Alejandro
artículos
Título:
Middle Eocene deformation and sedimentation in the Puna-Eastern Cordillera transition (23º26º S): Inheritance of preexisting anisotropies on the pattern of initial Andean shortening
Autor/es:
HONGN, F.; DEL PAPA, C.E; POWEL, J; PETRINOVIC, I.; MON, R.; VERACO, V.
Revista:
GEOLOGY
Editorial:
GSA
Referencias:
Lugar: Washington; Año: 2007 vol. 35 p. 271 - 274
ISSN:
0091-7613
Resumen:
The Quebrada de los Colorados Formation, at the north end of
Calchaquí Valley in Salta Province, northwest Argentina, preserves
evidence of syndepositional deformation since the middle Eocene
(ca. 40 Ma) that includes (1) an angular unconformity with the underlying
Salta Group (Paleogene), and (2) internal unconformities and
changes in vertical facies succession and provenance. Its fossil record
[mammalian (notoungulates), middle Eocene] is correlatable to the
Casa Grande Formation, which also unconformably overlies the Salta
Group; both units record middle Eocene deformation along the eastern
border of the Puna Plateau and outline previous fi rst-order mechanical
heterogeneities related to the Cretaceous rift basin border. Along the
western margin of the Puna, Eocene deformation coincides with thermal
(magmatic arc) and mechanical (basin inversion) heterogeneities.
Thus, the distribution of Eocene deformation followed an irregular pattern
as a consequence of the heritage of preexisting heterogeneities.