Stratigraphy and depositional architecture of the Viamonte Formation, Miocene, Tierra del Fuego, Argentina: the interplay between deep-marine transverse and longitudinal depositional systems

Revista de la Asociación Geológica Argentina

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Title Stratigraphy and depositional architecture of the Viamonte Formation, Miocene, Tierra del Fuego, Argentina: the interplay between deep-marine transverse and longitudinal depositional systems
 
Creator OLIVERO, Eduardo B.; CADIC-Conicet (CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS)
 
Subject Austral/Malvinas basin; Foreland basin; Architectural elements; Channel levee complexes; Gully fill.
 
Description ABSTRACT.- In the Atlantic coast of Tierra del Fuego, Miocene, foreland Austral basin strata of the Viamonte Formation are currently interpreted as deep marine channel-levee complexes. New data on sedimentary facies, paleocurrents, and stratigraphic relationships documents, however, more complex settings. We recognize in the Viamonte Formation three higher-rank architectural elements: 1) a transverse system of gullies and other slope deposits, including gully axis, gully off-axis/gully margin, and slope-gully abandonment sub-elements; 2) an axial system, the channel belt, including channel fill, lateral accretion, internal-levee/terrace, and basal slumps sub-elements; and 3) another axial system, the external levee. Gullies in the transverse system are carved into external-levee deposits of the Viamonte Formation or older lobe deposits. Dominant sedimentary facies are mass transport deposits in the gully fill; thin-bedded turbidites in the external levee, internal levee, and terraces; and thick, high-density turbidite sandstones in the channel fill. In the transverse system, paleocurrents are directed to the NW-NE, down dip high-relief progradational clinoforms, and in the axial systems to the SE, parallel to the basin foredeep. Axial systems are located either at the base, or at subtle slope-breaks of transverse clinoforms. The envisaged depositional architectures of these axial and transverse systems offer excellent analogues for similar, poorly exposed Upper Cretaceous-Paleogene Austral basin turbidites and may help to interpret the source and routing of sand-rich deposits in the adjacent Malvinas foreland basin.
 
Publisher Asociación Geológica Argentina
 
Contributor Universidad Nacional de TdF; CONICET
 
Date 2020-09-18
 
Type

 
Identifier http://ppct.caicyt.gov.ar/index.php/raga/article/view/18304
 
Source Revista de la Asociación Geológica Argentina; Vol 78, No 2 (2021): en preparación
Revista de la Asociación Geológica Argentina; Vol 78, No 2 (2021): en preparación
 
Language en
 
Rights Los autores conservan los derechos de autor y garantizan a la revista el derecho de ser la primera publicación del trabajo licenciado según una licencia de atribución Creative Commons que permite a otros compartir el trabajo con el reconocimiento de la autoría y de la publicación en la que se publicó por primera vez.
 

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