SciELO - Scientific Electronic Library Online

 
vol.69 issue1Neoproterozoic peritidal facies of the Villa Monica Formation, Sierra la J uanita, TandiliaFragmentation during outflow in the Las Lajas Jgnimbrite, Chon Aike Formation, Deseado Massif author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO

Share


Revista de la Asociación Geológica Argentina

Print version ISSN 0004-4822

Abstract

TUDISCA, Estefanía P; PAZOS, Pablo J; GHIGLIONE, Matías C  and  CIANFAGNA, Francisco A. Study of "The Upper Cabo Ladrillero Beds" in the homonym locality, Lower Miocene of the Austral Basin, Tierra del Fuego. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.1. ISSN 0004-4822.

In the cliffs of the Ladrillero cape, situated on the Atlantic coast of the Isla Grande de Tierra del Fuego, the uppermost records of the Austral or Magallanes foreland basin infill crop out. This locality contains Lower Mocene deposits informally named "Cabo Ladrillero beds" and "Cabo San Pablo beds" being the "upper Cabo Ladrillero beds" analyzed in this paper. This locality is situated around ten kilometers to the north of the emerging orogenic front (Punta Gruesa locality) where four facies association have been defined from gravitationally-driven supra batial to prograding and shallowing upward deltaic wedges. Deformed and massive beds by liquefaction processes and resedimentation are connected with abundant clastic dykes and synsedimentary faults. The statistic study suggests they are associated tectonic activity related to a transtensive episode rather than tectonic quiescence sometimes suggested in previous works. We conclude that microfossils documented in the area and used as a tool to support a deep marine environment are situated in underlying stratigraphic intervals that form part of the Desdémona Formation and the "lower Cabo Ladrillero beds" cropping out to the south of the study area. Sedimentological evidence are not conclusive respect to the batimetry but absence of classical turbidites, hyperpycnal flows and abundant deformed and resedimented deposits are more compatible with deltaic deposits, with high detritus supply generating unstable slopes rather than deep marine depositional settings, suggesting a more complex depositional evolution than the foraminiferal-based framework dominant in the literature.

Keywords : Foreland basin; Tectono-sedimentary analysis; Clastic dykes.

        · 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