SciELO - Scientific Electronic Library Online

vol.67 número2Evidencias de actividad paleosísmica en la fosa de Loncopué y faja plegada y corrida del Agrio (depocentro del Huecú), provincia de NeuquénAnálisis estructural de la cuenca de Las Salinas y su relación con la acumulación de sedimentos eólicos en el área Médanos Negros índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



  • No hay articulos citadosCitado por SciELO

Links relacionados

  • No hay articulos similaresSimilares en SciELO


Revista de la Asociación Geológica Argentina

versión impresa ISSN 0004-4822


GONZALEZ DIAZ, Emilio F  y  GARCIA MORABITO, Ezequiel. The "Ñireco Caldera" in the central-western Neuquén Andes (38º50'S - 70º50'O). Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.2, pp. 177-185. ISSN 0004-4822.

In the southern segment of the Copahue- Pino Hachado block, next to the Moquehue-Alumine lacustrine basin, an anomalous concentration of calderas, resulting from a Pliocene-Quaternary volcanic activity was recognized. The Ñireco caldera, which was proposed as part of this caldera complex, is the reason of the present work. The authors object the interpretation of such a morphostructural feature on the basis of a detailed geomorphologic, structural and stratigraphic analyses of the area. The limits of the proposed caldera coincide mostly with fluvial valleys that seem to be controlled by previous structures like faults and regional lineaments. There are no evidences that could suggest the presence of a volcanic complex that theoretically contains such a depression, or for its external and internal flanks. The central sector of the proposed caldera presents the highest altitude values of the region (± 2,900 m a.s.l.), which highly surpass those of the Principal Cordillera at these latitudes. The local stratigraphy of the area, is dominated by the oldest rocks of the region (Upper Paleozoic granitoids and Triassic volcanic and volcaniclastic sequences), and shows not temporal coincidence with the Pliocene-Quaternary volcanic activity, well represented immediately to the north. The study area falls on the contrary into a thick-skinned west-verging fold-and-thrust-belt, where tectonic inversion played a central role.

Palabras clave : Caldera; Copahue-Pino Hachado Block; Catan Lil.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License