Depósitos burdigalianos de la formación santa cruz en sierra baguales, cuenca austral (magallanes): Edad, ambiente de deposición y vertebrados fósiles

Translated title of the contribution: Burdigalian deposits of the santa cruz formation in the sierra baguales, austral (magallanes) basin: Age, depositional environment and vertebrate fossils

J. Enrique Bostelmann, Jacobus P. Le Roux, Ana Vásquez, Néstor M. Gutiérrez, José Luis Oyarzún, Catalina Carreño, Teresa Torres, Rodrigo Otero, Andrea Llanos, C. Mark Fanning, Francisco Hervé

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A succession of marine and continental strata on the southern flank of Cerro Cono in the Sierra Baguales, northeast of Torres del Paine, can be correlated with stratigraphic units exposed along the southern border of the Lago Argentino region in Santa Cruz Province, Argentina. These include the Estancia 25 de Mayo Formation and the basal part of the Santa Cruz Formation. The lithological correlation is also confirmed by detrital zircon ages (maximum age of 18.23±0.26 Ma) and a rich assemblage of terrestrial vertebrate fossils, biostratigraphically equivalent to a post-Colhuehuapian, pre-Santacrucian South American Land Mammal Age (SALMA) fauna, suggesting a range of 19 to 17.8 Ma. Similar ages have been obtained from the basal part of the Santa Cruz Formation at Estancia Quién Sabe in southwestern Argentina, supporting the assumption of a regional continuity between these deposits. A measured litho stratigraphic column is presented and the depositional environment is interpreted as a coastal plain with small, meandering rivers and ephemeral floodplain lakes. The sedimentation coincides with intensified uplift of the Patagonian Andes during the 'Quechua Phase' of Andean tectonism, which is reflected by a change in paleocurrent directions from northwest to east-northeast.

Translated title of the contributionBurdigalian deposits of the santa cruz formation in the sierra baguales, austral (magallanes) basin: Age, depositional environment and vertebrate fossils
Original languageSpanish
Pages (from-to)458-489
Number of pages32
JournalAndean Geology
Volume40
Issue number3
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

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