SciELO - Scientific Electronic Library Online

vol.69 issue1Geology and petrology of mafic-ultramafic body from Las Juntas, Valle Fértil, San JuanNew evidence of Quaternary tectonic activity in the Matagusanos-Zonda-Acequión Depression, San Juan Province author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO


Revista de la Asociación Geológica Argentina

On-line version ISSN 1851-8249


KOKOT, Roberto R  and  CHOMNALEZ, Florencia. Retreat of the line of coast in Las Grutas, Río Negro province. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.1. ISSN 1851-8249.

The town of Las Grutas, province of Río Negro, has a cliffed coastline with an extensive coastal platform. Mentioned land-forms are formed above Paleogene sedimentary rocks for the Gran Bajo del Gualicho Formation. Rely on them in erosive unconformity Pleistocene beach ridges deposits and the sequence ends with Holocene dune deposits. By comparing aerial photographs and satellite images, it was determined that the coast was eroded from 1969 to nowadays. The retreat was studied by comparing aerial photographs and georeferenced satellite imagery. The results show a downward trend of the dunes, the retreat of shore platforms and coastal shoreline. The latter has an average erosion rate of 1.50 m in 39 years. However, the central and northern sectors are most affected reaching up to 3 m setback in the same period. These erosion and resulting mass movement processes respond mainly to intense wave action on coastal outcrops, especially in coastal areas most exposed to the breakers, as well as the determining geological/structural outcrops exposed. The dangerous scenario is exacerbated by human action that contributes to the acceleration of the natural processes.

Keywords : Coastal erosion; Shore platform; Pleistocene beach ridges; Sea levelfall.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


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