High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)

The Miocene infill of the Cacheuta Basin (central Argentinian foreland) comprises the Mariño and La Pilona formations, which record continental sedimentation related to the major phases of uplift of the Andean chain around 33° S over 1500 m of stratigraphy. Sedimentological and stratigraphic evidenc...

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Autores principales: Hunger, Gabriel, Ventra, Dario, Moscariello, Andrea, Veiga, Gonzalo Diego, Chiaradia, Massimo
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Geología
Autogenic
Distributive fluvial system
Fluvial fan
Foreland
Geochemistry
Provenance
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98100
https://ri.conicet.gov.ar/11336/57421
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98100
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Autogenic
Distributive fluvial system
Fluvial fan
Foreland
Geochemistry
Provenance
spellingShingle Geología
Autogenic
Distributive fluvial system
Fluvial fan
Foreland
Geochemistry
Provenance
Hunger, Gabriel
Ventra, Dario
Moscariello, Andrea
Veiga, Gonzalo Diego
Chiaradia, Massimo
High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
topic_facet Geología
Autogenic
Distributive fluvial system
Fluvial fan
Foreland
Geochemistry
Provenance
description The Miocene infill of the Cacheuta Basin (central Argentinian foreland) comprises the Mariño and La Pilona formations, which record continental sedimentation related to the major phases of uplift of the Andean chain around 33° S over 1500 m of stratigraphy. Sedimentological and stratigraphic evidence suggest the succession to represent progradation of a fluvial-fan sourced from the western, orogenic margin of the foreland basin. The integration of compositional data and sedimentological observations consent to disentangle the relative roles of allogenic factors over long time scales, and to separate them from system-scale autogenic dynamics. The geochemical, mineralogical and radiogenic-isotope composition of sandstones through the succession show a progressive change in the composition of magmatic source rocks from more primitive (basaltic-andesitic) to relatively more evolved (dacitic), testifying the uplift of the western part of the Principal Cordillera, followed by the sequential eastward advance of the thrust and volcanic fronts toward the foreland basin, in agreement with established chronologies of Andean structural development at these latitudes. Sandstones from the La Pilona Formation record compositional signatures suggesting the first stages of uplift of the Frontal Cordillera. The gradual changes in the compositional signal are attributed to changing weathering conditions related to climate and to source-rock changes, related to the Miocene tectonic evolution of the Andean range. However, results suggest that the influence of large-scale allogenic factors is partly blurred by the effects of autogenic fluctuating depositional processes, especially during deposition of the La Pilona Formation. The gradual transitions in provenance and weathering signals suggest that vertical architectural and facies changes through the succession are likely related to the long-term, progradational evolution of the fluvial-system, rather than to allogenic changes in basin accommodation or climate-related sediment supply.
format Articulo
Preprint
author Hunger, Gabriel
Ventra, Dario
Moscariello, Andrea
Veiga, Gonzalo Diego
Chiaradia, Massimo
author_facet Hunger, Gabriel
Ventra, Dario
Moscariello, Andrea
Veiga, Gonzalo Diego
Chiaradia, Massimo
author_sort Hunger, Gabriel
title High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
title_short High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
title_full High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
title_fullStr High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
title_full_unstemmed High-resolution compositional analysis of a fluvial-fan succession: the Miocene infill of the Cacheuta Basin (central Argentinian foreland)
title_sort high-resolution compositional analysis of a fluvial-fan succession: the miocene infill of the cacheuta basin (central argentinian foreland)
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/98100
https://ri.conicet.gov.ar/11336/57421
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