Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan

Mostrar todas las versiones(3)

This paper deals with the sedimentological characteristics of piedmont deposits exposed in intramontane basins of the Precordillera. Detailed studies carried out along the upper Jáchal river and in the Gualilán area allowed identifying and characterizing six major types of piedmont accumulations: 1)...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Suriano, J., Limarino, C.O.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2009
Materias:
Intramontane basins
Piedmonts
Sedimentary models
alluvial fan
breccia
channel flow
clastic sediment
colluvial deposit
conglomerate
geoaccumulation
headwater
intramontane basin
mudstone
piedmont
sedimentation
talus
Argentina
Jachal River
Precordillera
San Juan [Argentina]
Conoidea
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v65_n3_p516_Suriano
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_00044822_v65_n3_p516_Suriano
record_format dspace
spelling paperaa:paper_00044822_v65_n3_p516_Suriano2023-06-12T16:40:26Z Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan Rev. Asoc. Geol. Argent. 2009;65(3):516-532 Suriano, J. Limarino, C.O. Intramontane basins Piedmonts Sedimentary models alluvial fan breccia channel flow clastic sediment colluvial deposit conglomerate geoaccumulation headwater intramontane basin mudstone piedmont sedimentation talus Argentina Jachal River Precordillera San Juan [Argentina] Conoidea This paper deals with the sedimentological characteristics of piedmont deposits exposed in intramontane basins of the Precordillera. Detailed studies carried out along the upper Jáchal river and in the Gualilán area allowed identifying and characterizing six major types of piedmont accumulations: 1) talus, 2) colluvial fans dominated by gravity flows, 3) colluvial fans dominated by fluid flows, 4) collector-conoid fluvial system, 5) piedmonts dominated by channalized flows and 6) alluvial fans. The talus deposits are characterized by the dominance of clast-supported breccias (bearing minimum matrix amounts) that commonly exhibit massive bedding, planar or high angle imbricated clasts fabric. Colluvial fans dominated by gravity flows are formed by massive matrix-supported breccias with minor percentages of clast-supported breccias. On the contrary, colluvial fans dominated by fluid flows are composed of amalgamated channels infilled by both clast- and matrix-supported breccias together with intercalation of graded breccias. Accumulations of the collector-conoid fluvial systems are the most diverse in composition, including from massive matrix-supported breccias to cross-bedded conglomerates and scarce mudstones. In relation to the piedmont dominated by channalized flows, they comprise massive clast-supported breccias and less amounts of imbricated or cross-bedded ones. The alluvial fan deposits are mostly composed of cross-bedded clast-supported conglomerates, though matrix-supported conglomerates and breccias also appear as proximal deposits. Different from the previously mentioned deposits, the clast of alluvial fan accumulations shows more varied lithologic composition. The comparative analysis of the piedmonts found in the studied valleys permits to propone a conceptual model for classification of piedmont, on the basis of the extension of the basins and vertical space of accommodation. Fil:Suriano, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v65_n3_p516_Suriano
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Intramontane basins
Piedmonts
Sedimentary models
alluvial fan
breccia
channel flow
clastic sediment
colluvial deposit
conglomerate
geoaccumulation
headwater
intramontane basin
mudstone
piedmont
sedimentation
talus
Argentina
Jachal River
Precordillera
San Juan [Argentina]
Conoidea
spellingShingle Intramontane basins
Piedmonts
Sedimentary models
alluvial fan
breccia
channel flow
clastic sediment
colluvial deposit
conglomerate
geoaccumulation
headwater
intramontane basin
mudstone
piedmont
sedimentation
talus
Argentina
Jachal River
Precordillera
San Juan [Argentina]
Conoidea
Suriano, J.
Limarino, C.O.
Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
topic_facet Intramontane basins
Piedmonts
Sedimentary models
alluvial fan
breccia
channel flow
clastic sediment
colluvial deposit
conglomerate
geoaccumulation
headwater
intramontane basin
mudstone
piedmont
sedimentation
talus
Argentina
Jachal River
Precordillera
San Juan [Argentina]
Conoidea
description This paper deals with the sedimentological characteristics of piedmont deposits exposed in intramontane basins of the Precordillera. Detailed studies carried out along the upper Jáchal river and in the Gualilán area allowed identifying and characterizing six major types of piedmont accumulations: 1) talus, 2) colluvial fans dominated by gravity flows, 3) colluvial fans dominated by fluid flows, 4) collector-conoid fluvial system, 5) piedmonts dominated by channalized flows and 6) alluvial fans. The talus deposits are characterized by the dominance of clast-supported breccias (bearing minimum matrix amounts) that commonly exhibit massive bedding, planar or high angle imbricated clasts fabric. Colluvial fans dominated by gravity flows are formed by massive matrix-supported breccias with minor percentages of clast-supported breccias. On the contrary, colluvial fans dominated by fluid flows are composed of amalgamated channels infilled by both clast- and matrix-supported breccias together with intercalation of graded breccias. Accumulations of the collector-conoid fluvial systems are the most diverse in composition, including from massive matrix-supported breccias to cross-bedded conglomerates and scarce mudstones. In relation to the piedmont dominated by channalized flows, they comprise massive clast-supported breccias and less amounts of imbricated or cross-bedded ones. The alluvial fan deposits are mostly composed of cross-bedded clast-supported conglomerates, though matrix-supported conglomerates and breccias also appear as proximal deposits. Different from the previously mentioned deposits, the clast of alluvial fan accumulations shows more varied lithologic composition. The comparative analysis of the piedmonts found in the studied valleys permits to propone a conceptual model for classification of piedmont, on the basis of the extension of the basins and vertical space of accommodation.
format Artículo
Artículo
publishedVersion
author Suriano, J.
Limarino, C.O.
author_facet Suriano, J.
Limarino, C.O.
author_sort Suriano, J.
title Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
title_short Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
title_full Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
title_fullStr Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
title_full_unstemmed Piedmont sedimentation in the headwaters of the Río Jachal and Pampa de Gualilán, Precordillera of San Juan
title_sort piedmont sedimentation in the headwaters of the río jachal and pampa de gualilán, precordillera of san juan
publishDate 2009
url http://hdl.handle.net/20.500.12110/paper_00044822_v65_n3_p516_Suriano
work_keys_str_mv AT surianoj piedmontsedimentationintheheadwatersoftheriojachalandpampadegualilanprecordilleraofsanjuan
AT limarinoco piedmontsedimentationintheheadwatersoftheriojachalandpampadegualilanprecordilleraofsanjuan
_version_ 1769810151686012928

Ejemplares similares