Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina

The Vinchina Formation was deposited between 16 and 8 My in a broken foreland basin, recording sedimentation in continental environments, reaching a huge thickness (around 6 km). Thirteen sedimentary facies were defined along the Sierra de Los Colorados representing fluvial, eolian-fluvial interacti...

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Autores principales: Schencman, L.J., Marenssi, S.A., Díaz, M.
Formato: JOUR
Materias:
Foreland
Miocene
Paleoenvironments
Vinchina formation
conglomerate
foreland basin
lacustrine deposit
lithology
meander
paleoenvironment
sediment transport
sedimentation
Argentina
La Rioja [Argentina]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p17_Schencman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v75_n1_p17_Schencman2023-10-03T13:59:22Z Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina Schencman, L.J. Marenssi, S.A. Díaz, M. Foreland Miocene Paleoenvironments Vinchina formation conglomerate foreland basin lacustrine deposit lithology meander Miocene paleoenvironment sediment transport sedimentation Argentina La Rioja [Argentina] The Vinchina Formation was deposited between 16 and 8 My in a broken foreland basin, recording sedimentation in continental environments, reaching a huge thickness (around 6 km). Thirteen sedimentary facies were defined along the Sierra de Los Colorados representing fluvial, eolian-fluvial interaction, alluvial, lacustrine and eolian environments. The lateral distribution of the facies allowed to distinguish three sectors: north, center and south. The northern area shows the greatest abundance of conglomerates and the largest size clasts. The central sector comprises sandstones and mudstones in similar proportions, whereas in the south mudstones predominate. This lithological variation allows supposing that sediments distribution pattern was north-south. The vertical evolution of sedimentary paleoenvironments can be synthesized in four stages. Stage 1 comprises the basal deposits (basal part of the Lower Member): the sediment was transported by ephemeral braided systems and later reworked by wind processes (eolian-fluvial systems). Stage 2 comprises the maining part of the Lower Member and it is characterized by fluvial transport by anastomosed rivers and terminal lobes systems. The region continued in a distal position respect to the nearest elevated area (Sierra de Toro Negro), which experienced coeval rising. The lower third of the Upper Member corresponds to stage 3 when river systems were sand-gravel braided (north), were sand-gravel braided and meandering (central region), and anastomosed that engage with eolian systems (south). During stage 4 (upper portion of the Upper Member) meandering systems were developed (middle sector), which provided an important amount of fine-grained sediment to ephemeral lacustrine systems (south). © 2018, Taylor and Francis Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p17_Schencman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Foreland
Miocene
Paleoenvironments
Vinchina formation
conglomerate
foreland basin
lacustrine deposit
lithology
meander
Miocene
paleoenvironment
sediment transport
sedimentation
Argentina
La Rioja [Argentina]
spellingShingle Foreland
Miocene
Paleoenvironments
Vinchina formation
conglomerate
foreland basin
lacustrine deposit
lithology
meander
Miocene
paleoenvironment
sediment transport
sedimentation
Argentina
La Rioja [Argentina]
Schencman, L.J.
Marenssi, S.A.
Díaz, M.
Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
topic_facet Foreland
Miocene
Paleoenvironments
Vinchina formation
conglomerate
foreland basin
lacustrine deposit
lithology
meander
Miocene
paleoenvironment
sediment transport
sedimentation
Argentina
La Rioja [Argentina]
description The Vinchina Formation was deposited between 16 and 8 My in a broken foreland basin, recording sedimentation in continental environments, reaching a huge thickness (around 6 km). Thirteen sedimentary facies were defined along the Sierra de Los Colorados representing fluvial, eolian-fluvial interaction, alluvial, lacustrine and eolian environments. The lateral distribution of the facies allowed to distinguish three sectors: north, center and south. The northern area shows the greatest abundance of conglomerates and the largest size clasts. The central sector comprises sandstones and mudstones in similar proportions, whereas in the south mudstones predominate. This lithological variation allows supposing that sediments distribution pattern was north-south. The vertical evolution of sedimentary paleoenvironments can be synthesized in four stages. Stage 1 comprises the basal deposits (basal part of the Lower Member): the sediment was transported by ephemeral braided systems and later reworked by wind processes (eolian-fluvial systems). Stage 2 comprises the maining part of the Lower Member and it is characterized by fluvial transport by anastomosed rivers and terminal lobes systems. The region continued in a distal position respect to the nearest elevated area (Sierra de Toro Negro), which experienced coeval rising. The lower third of the Upper Member corresponds to stage 3 when river systems were sand-gravel braided (north), were sand-gravel braided and meandering (central region), and anastomosed that engage with eolian systems (south). During stage 4 (upper portion of the Upper Member) meandering systems were developed (middle sector), which provided an important amount of fine-grained sediment to ephemeral lacustrine systems (south). © 2018, Taylor and Francis Ltd. All rights reserved.
format JOUR
author Schencman, L.J.
Marenssi, S.A.
Díaz, M.
author_facet Schencman, L.J.
Marenssi, S.A.
Díaz, M.
author_sort Schencman, L.J.
title Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
title_short Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
title_full Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
title_fullStr Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
title_full_unstemmed Paleoenvironmental evolution of the Vinchina formation (Miocene) along the sierra de los Colorados, La Rioja, Argentina
title_sort paleoenvironmental evolution of the vinchina formation (miocene) along the sierra de los colorados, la rioja, argentina
url http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p17_Schencman
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AT diazm paleoenvironmentalevolutionofthevinchinaformationmiocenealongthesierradeloscoloradoslariojaargentina
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