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dc.contributor.author
Paredes, José Matildo
dc.contributor.author
Foix, Nicolas
dc.contributor.author
Colombo Piñol, Ferran
dc.contributor.author
Nillni, Adriana Mónica
dc.contributor.author
Allard, Jose Oscar
dc.contributor.author
Marquillas, Rosa Argentina
dc.date.available
2021-05-03T11:13:21Z
dc.date.issued
2007-11-15
dc.identifier.citation
Paredes, José Matildo; Foix, Nicolas; Colombo Piñol, Ferran; Nillni, Adriana Mónica; Allard, Jose Oscar; et al.; Volcanic and climatic controls on fluvial style in a high-energy system: The Lower Cretaceous Matasiete Formation, Golfo San Jorge basin, Argentina; Elsevier Science; Sedimentary Geology; 202; 1-2; 15-11-2007; 96-123
dc.identifier.issn
0037-0738
dc.identifier.uri
http://hdl.handle.net/11336/131223
dc.description.abstract
The Cretaceous Chubut Group in the Golfo San Jorge Basin (Patagonia, Argentina) comprises up to 6000 m of continental sediments. At the base of the succession, an extensive saline-alkaline lacustrine unit (Pozo D-129 Fm) grades laterally towards the basin margin into the fluvial Matasiete Fm (Hauterivian?-Aptian). The Matasiete Fm comprises up to 650 m of siliciclastic and pyroclastic deposits in its type area, where three Members have been distinguished. The following facies associations were identified: 1) single fluvial channels; 2) multistorey fluvial channels; 3) proximal floodplain; 4) distal floodplain; 5) pyroclastic (ash-fall and ground-surge) deposits. Additional observations in the time-equivalent Pozo D-129 Fm provide evidence for 6) shallow lacustrine, and 7) deep-lacustrine facies associations. The floodplain association contains paleosols with abundant carbonate concretions and fine pyroclastic tuffs. Paleosols are mostly vertisols, characterized by deep desiccation cracks, slickensides and carbonate nodules. These observations, coupled with the occurrence of shallow-water oolitic grainstones in the lacustrine Pozo D-129 Fm indicate a semiarid environment. Tree trunks up to 1 m in diameter and 15 m long, preferentially located near channel margins, provide evidence for vegetated riverbanks. The exposures of the Matasiete formation in the San Bernardo Fold Belt show individual channel belts containing straight, meandering and braided channels. Evidence of changes in fluvial style attributable to base-level control has not been observed. The most dramatic changes in fluvial architecture, which were comparatively short-lived, were provoked by intermittent pyroclastic deposition on the floodplain. The reduced infiltration capacity of the floodplain and the concomitant increase in sediment load increased runoff, as well as volume and flashiness of the discharge, which favoured the development of shallow, multichannel rivers. The fluvial system abruptly changed from single, ribbon channels to a braided system, which notably increased the width/thickness ratio of sandbodies.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
dc.subject
CLIMATIC AND VOLCANIC CONTROLS
dc.subject
CRETACEOUS
dc.subject
FLUVIAL ARCHITECTURE
dc.subject
HIGH-ENERGY FLUVIAL SYSTEMS
dc.subject
PATAGONIA
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PYROCLASTIC INPUT
dc.subject.classification
Geología
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Volcanic and climatic controls on fluvial style in a high-energy system: The Lower Cretaceous Matasiete Formation, Golfo San Jorge basin, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-04-19T14:11:38Z
dc.journal.volume
202
dc.journal.number
1-2
dc.journal.pagination
96-123
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Paredes, José Matildo. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
dc.description.fil
Fil: Foix, Nicolas. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Colombo Piñol, Ferran. Universidad de Barcelona; España
dc.description.fil
Fil: Nillni, Adriana Mónica. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
dc.description.fil
Fil: Allard, Jose Oscar. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro. Departamento de Geología; Argentina
dc.description.fil
Fil: Marquillas, Rosa Argentina. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina
dc.journal.title
Sedimentary Geology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.sedgeo.2007.05.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0037073807001728?via%3Dihub
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