SciELO - Scientific Electronic Library Online

vol.61 número1Modelo de sedimentación continental para el rift cretácico de la Argentina central: Ejemplo de la sierra de las Quijadas, San LuisEvolución magmática del Granito Peñón Rosado, Cerro Asperecito, flanco occidental de la sierra de Famatina índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




  • Não possue artigos citadosCitado por SciELO

Links relacionados

  • Não possue artigos similaresSimilares em SciELO


Revista de la Asociación Geológica Argentina

versão impressa ISSN 0004-4822versão On-line ISSN 1851-8249


BUJALESKY, G.G.  e  ISLA, F.I.. Quaternary deposits of the Fuegian Atlantic coast between Peñas and Ewan capes. Rev. Asoc. Geol. Argent. [online]. 2006, vol.61, n.1, pp.81-92. ISSN 0004-4822.

The littoral zone of north-eastern Tierra del Fuego located between Cabo Peñas and Cabo Ewan was affected by processes related to the Quaternary glaciations and marine transgressions. This was a free-ice area at least since 1.5 Ma B.P. Glacifluvial deposits were re-worked by litoral processes that formed gravel beaches during highstands of the sea level. Four levels of Pleistocene gravel beaches were recognized in the area. The younger and lower levels would probably correspond to the oxygen isotope stage 5e (La Sara Formation, altitude about 7 m above the present storm berm) and 7 (Shaiwaal Formation, 12 m a.p.s.b.). The older and higher levels would be older than the isotope stage 18O 11 (Viamonte Formation, 38 m a.p.s.b. and Najmishk Formation, 53 m a.p.s.b.). These are the southernmost Pleistocene raised beaches of the world. During the Holocene, approximately 5000 yr B.P., beach ridge plains composed of gravel begun to plug the inner estuaries of the Ensenada de la Colonia and Río Fuego palaeoembayments. These beach ridge plains have shown a regressive behaviour during the Holocene. They do not revealed erosion, sediment recycling at the seaward flank (cannibalism), and a significant landward retreat like the northernmost littoral environments of the Atlantic coast of Tierra del Fuego.

Palavras-chave : Quaternary deposits; Pleistocene; Holocene; Gravel beaches; Tierra del Fuego.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons