Geomorfología y evolución geológica reciente del litoral del Parque Nacional Pan de Azúcar(norte de Chile)
- Tatiana Izquierdo 1
- Germán Carrasco 2
- Joaquín Rodríguez Vidal 3
- Francisco Ruiz 3
- Manuel Abad 4
- 1 nstituto de Investigaciones Científicas y Tecnológicas de la Universidad de Atacama, Copiapó (Chile)
- 2 Grupo de investigación Recursos Hídricos y Geología del Cuaternario de Atacama, Universidad de Atacama, Copiapó (Chile)
- 3 Departamento de Ciencias de la Tierra, Universidad de Huelva
- 4 Área de Geología, ESCET, Universidad Rey Juan Carlos, Madrid
ISSN: 0213-683X
Year of publication: 2020
Issue: 67
Pages: 111-114
Type: Article
More publications in: Geogaceta
Abstract
The geomorphological analysis of the coastal sector of Pan de Azúcar National Park (Chile) allows describing several stages in its recent geological evolution, mainly controlled by the climate, varia-tions in the sea-level and the uplift of the Cordillera de la Costa. The first phases refer to the formation of three generations of marine te-rraces, while the last stage involves the Present Interglacial, the es-tablishment of the current sea-level, the formation of the Holocene marine cliff and the development of active forms, with predominance of the eolian and fluvial/alluvial processes on this coastal segment of the southern Atacama Desert. For the first time, the occurrence of a low marine terrace that crops out near current sea-level is described in the study area. It has been dated in ~44000 years and associated with the MIS-3 highstand. This age corroborates the beginning of a cycle of accelerated tectonic uplift, with rates of ~ 1 m/ka, recently proposed for northern Chile that would continue until today.