Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)

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An ancient alluvial fan and its subsequent evolution are described. Ancient alluvial fan accumulations have been interpreted as the northern continuation of the rodados patagónicos of the Montemayor Plateau, a proposal that is contested. The methodological recognition of the ancient alluvial fan and...

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Autores principales: González Díaz, E.F., di Tommaso, I.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2011
Materias:
Capture
Chubut river
Cut and fill terraces
Geomorphology
Palaeo-drainage
alluvial fan
chronology
drainage
geomorphology
landform evolution
Pleistocene
terrace
valley
Argentina
Chubut
Chubut River
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v68_n4_p507_GonzalezDiaz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v68_n4_p507_GonzalezDiaz2023-06-12T16:40:40Z Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province) Rev. Asoc. Geol. Argent. 2011;68(4):507-525 González Díaz, E.F. di Tommaso, I. Capture Chubut river Cut and fill terraces Geomorphology Palaeo-drainage alluvial fan chronology drainage geomorphology landform evolution Pleistocene terrace valley Argentina Chubut Chubut River An ancient alluvial fan and its subsequent evolution are described. Ancient alluvial fan accumulations have been interpreted as the northern continuation of the rodados patagónicos of the Montemayor Plateau, a proposal that is contested. The methodological recognition of the ancient alluvial fan and its genetic and temporary distinction, were made from geomorphologic analysis and altimetric evaluation. Time assignment is a problem not yet solved. The methodology led to three different geomorphic systems or levels related to successive episodes of aggradation and erosion, with increasing lower positions, which coincide with a complex paleodrainage ancient alluvial fan. its successive developments are linked to proposed proto-rivers Chubut 1, 2, 3 and to a Simpson paleo-valley. Despite the mentioned limitations, we propose that the evolutionary model of ancient alluvial fan responds to a structure of cut and fill which is supported by the poly-formational composition of an ancient alluvial fan, and a gradual southward migration of the paleo-drainage. Based on geomorphologic analysis and altimetric distinction an upper level, composed of the remains of three plains (Pa, Pm and Pb), a middle level with two terraces (T1 and T2) and a complex lower level and five terraces (T3, T4, T5 T6 and T7) were recognized. Relict evidences of paleo-drainages are proposed based on the Estancia Paz and Don Morgan-Saraza paleo-valleys in the upper level. The age of the ancient alluvial fan based on the geomorphic evolution of the study area is tentatively assigned to an uncertain period between the late Pleistocene and late Sangamon interglacial at the end of the last glaciation. Fil:di Tommaso, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 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_v68_n4_p507_GonzalezDiaz
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 Capture
Chubut river
Cut and fill terraces
Geomorphology
Palaeo-drainage
alluvial fan
chronology
drainage
geomorphology
landform evolution
Pleistocene
terrace
valley
Argentina
Chubut
Chubut River
spellingShingle Capture
Chubut river
Cut and fill terraces
Geomorphology
Palaeo-drainage
alluvial fan
chronology
drainage
geomorphology
landform evolution
Pleistocene
terrace
valley
Argentina
Chubut
Chubut River
González Díaz, E.F.
di Tommaso, I.
Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
topic_facet Capture
Chubut river
Cut and fill terraces
Geomorphology
Palaeo-drainage
alluvial fan
chronology
drainage
geomorphology
landform evolution
Pleistocene
terrace
valley
Argentina
Chubut
Chubut River
description An ancient alluvial fan and its subsequent evolution are described. Ancient alluvial fan accumulations have been interpreted as the northern continuation of the rodados patagónicos of the Montemayor Plateau, a proposal that is contested. The methodological recognition of the ancient alluvial fan and its genetic and temporary distinction, were made from geomorphologic analysis and altimetric evaluation. Time assignment is a problem not yet solved. The methodology led to three different geomorphic systems or levels related to successive episodes of aggradation and erosion, with increasing lower positions, which coincide with a complex paleodrainage ancient alluvial fan. its successive developments are linked to proposed proto-rivers Chubut 1, 2, 3 and to a Simpson paleo-valley. Despite the mentioned limitations, we propose that the evolutionary model of ancient alluvial fan responds to a structure of cut and fill which is supported by the poly-formational composition of an ancient alluvial fan, and a gradual southward migration of the paleo-drainage. Based on geomorphologic analysis and altimetric distinction an upper level, composed of the remains of three plains (Pa, Pm and Pb), a middle level with two terraces (T1 and T2) and a complex lower level and five terraces (T3, T4, T5 T6 and T7) were recognized. Relict evidences of paleo-drainages are proposed based on the Estancia Paz and Don Morgan-Saraza paleo-valleys in the upper level. The age of the ancient alluvial fan based on the geomorphic evolution of the study area is tentatively assigned to an uncertain period between the late Pleistocene and late Sangamon interglacial at the end of the last glaciation.
format Artículo
Artículo
publishedVersion
author González Díaz, E.F.
di Tommaso, I.
author_facet González Díaz, E.F.
di Tommaso, I.
author_sort González Díaz, E.F.
title Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
title_short Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
title_full Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
title_fullStr Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
title_full_unstemmed Geomorphological evolution and relative chronology of terrace levels adjacent to the Chubut river mouth to the Atlantic (Chubut Province)
title_sort geomorphological evolution and relative chronology of terrace levels adjacent to the chubut river mouth to the atlantic (chubut province)
publishDate 2011
url http://hdl.handle.net/20.500.12110/paper_00044822_v68_n4_p507_GonzalezDiaz
work_keys_str_mv AT gonzalezdiazef geomorphologicalevolutionandrelativechronologyofterracelevelsadjacenttothechubutrivermouthtotheatlanticchubutprovince
AT ditommasoi geomorphologicalevolutionandrelativechronologyofterracelevelsadjacenttothechubutrivermouthtotheatlanticchubutprovince
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