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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 Miocene 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.


Documento: Artículo
Título:Study of "the upper Cabo Ladrillero beds" in the homonym locality, lower Miocene of the Austral basin, Tierra del fuego
Autor:Tudisca, E.P.; Pazos, P.J.; Ghiglione, M.C.; Cianfagna, F.A.
Filiación:Pluspetrol S.A, Argentina
Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), UBA Consejo Nacional de Investigaciones Científicas y Técnicos (CONICET), Argentina
UBA-FCEN-Departamento de Ciencias Geológicas, Buenos Aires, C1428EhA, Argentina
Palabras clave:Clastic dykes; Foreland basin; Tectono-sedimentary analysis; clastic dike; depositional environment; foreland basin; microfossil; Miocene; tectonic evolution; transtension; Isla Grande de Tierra del Fuego; Tierra del Fuego [(ARC) South America]; Desdemona
Página de inicio:43
Página de fin:60
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.


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---------- APA ----------
Tudisca, E.P., Pazos, P.J., Ghiglione, M.C. & Cianfagna, F.A. (2012) . Study of "the upper Cabo Ladrillero beds" in the homonym locality, lower Miocene of the Austral basin, Tierra del fuego . Revista de la Asociacion Geologica Argentina, 69(1), 43-60.
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Tudisca, E.P., Pazos, P.J., Ghiglione, M.C., Cianfagna, F.A. "Study of "the upper Cabo Ladrillero beds" in the homonym locality, lower Miocene of the Austral basin, Tierra del fuego " . Revista de la Asociacion Geologica Argentina 69, no. 1 (2012) : 43-60.
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---------- MLA ----------
Tudisca, E.P., Pazos, P.J., Ghiglione, M.C., Cianfagna, F.A. "Study of "the upper Cabo Ladrillero beds" in the homonym locality, lower Miocene of the Austral basin, Tierra del fuego " . Revista de la Asociacion Geologica Argentina, vol. 69, no. 1, 2012, pp. 43-60.
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---------- VANCOUVER ----------
Tudisca, E.P., Pazos, P.J., Ghiglione, M.C., Cianfagna, F.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. 2012;69(1):43-60.
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