SciELO - Scientific Electronic Library Online

 
vol.68 número2Plantas Fósiles del Grupo Choiyoi, Cordillera Frontal a la Latitud del río MendozaInventario de procesos de remoción en masa de un sector del departamento Iglesia, San Juan índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

  • No hay articulos citadosCitado por SciELO

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Bookmark


Revista de la Asociación Geológica Argentina

versión impresa ISSN 0004-4822

Resumen

RAMOS, Miguel E et al. Structure, stratigraphy and tectonic evolution of  the Ñirihuau basin in the río Cushamen region, Chubut. Rev. Asoc. Geol. Argent. [online]. 2011, vol.68, n.2, pp. 210-224. ISSN 0004-4822.

The southern part of  the Ñirihuau basin at the valley of  the Cushamen River region, is deformed and uplifted forming a prominent Precordillera Patagónica fold and thrust belt, east of  the Patagonian Andes. The Ñirihuau Basin infill is represented by Oligocene to Miocene sedimentary to volcaniclastic rocks gathered in eleven lithotypes belonging to four members. These foreland sequences are exposed by a combination of  thin-skinned deformation whose shortening is transferred to the basement in the west beneath the Cordón del Maitén. The entire Ñirihuau section as well as the overlying Collón Cura Formation is characterized by the occurrence of  progressive unconformities, fact that implies synorogenic sedimentation at the time of the Cordón del Maitén range uplift. This belt is formed by an east-verging basement wedge associated with a series of  backthrusts. The reactivation of  the deformation associated with growth strata, indicates that the basin has evolved in a wedge-top of  a foreland system in different pulses of  deformation.

Palabras llave : Synorogenic basins; Patagonia; Ñirihuau Basin; Progressive uncomformities.

        · resumen en Español     · texto en Español     · pdf en Español