Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén)
A process of stream piracy caused by the active retrograde erosion of Limay Chico stream - a tributary of Limay river- is described. It is located in the southern part of headwaters of the Alicurá drainage basin, tributary of Collon Cura river. It is supposed that the increment of the headward erosi...
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todo:paper_00044822_v63_n1_p76_GonzalezDiaz2023-10-03T13:58:21Z Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) González Díaz, E.F. Castro Godoy, S. Arroyo Alicurá Headward erosion Limay Chico Stream piracy fault scarp fluvial geomorphology fluvial process headwater river evolution sediment transport slope stability stream channel streamflow terrace tributary Argentina Limay Valley South America Cura A process of stream piracy caused by the active retrograde erosion of Limay Chico stream - a tributary of Limay river- is described. It is located in the southern part of headwaters of the Alicurá drainage basin, tributary of Collon Cura river. It is supposed that the increment of the headward erosion is related to the postglacial climatic conditions and a coetaneous deepening of the Limay river channel, a process expressed by modern and lower erosion terraces. Moreover the retrograde erosion was enhanced by the special location of the Limay Chico valley along an important line of structural weakness, the Limay Chico fault. The fluvial capture and the consequent diversion of the Alicurá basin upper part showed previous favorable conditions: 1) the topographic lower disposition of Limay Chico stream and their base level; 2) its steeper slope and the location of Limay Chico valley along a zone of structural and litologicalk weakness; 3) transverse arrangement of the Alicurá river's headwaters; 4) its gentle slope and location of their basin and base level at a topographic higher level. Several wind gaps were recognized and were interpreted two probable elbows of capture and barbed pattern. Also the increment of discharge of Limay Chico stream caused in their basin local phenomena of static rejuvenation. It is suppose a close genetic relation between the landslides observed along the steep fault scarp promoted by the Limay Chico Fault and the postglacial climatic change and the local erosional deepening of Limay Chico valley. The slumps characterized by the coalescence of their scan, generated the irregular and ruged landscape of the western side of Limay Chico valley. On the eastern valley slope the slumps reach minor expression. Longitudinal profils and slopes of the analized streams are included. Fil:Castro Godoy, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v63_n1_p76_GonzalezDiaz |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Arroyo Alicurá Headward erosion Limay Chico Stream piracy fault scarp fluvial geomorphology fluvial process headwater river evolution sediment transport slope stability stream channel streamflow terrace tributary Argentina Limay Valley South America Cura |
spellingShingle |
Arroyo Alicurá Headward erosion Limay Chico Stream piracy fault scarp fluvial geomorphology fluvial process headwater river evolution sediment transport slope stability stream channel streamflow terrace tributary Argentina Limay Valley South America Cura González Díaz, E.F. Castro Godoy, S. Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
topic_facet |
Arroyo Alicurá Headward erosion Limay Chico Stream piracy fault scarp fluvial geomorphology fluvial process headwater river evolution sediment transport slope stability stream channel streamflow terrace tributary Argentina Limay Valley South America Cura |
description |
A process of stream piracy caused by the active retrograde erosion of Limay Chico stream - a tributary of Limay river- is described. It is located in the southern part of headwaters of the Alicurá drainage basin, tributary of Collon Cura river. It is supposed that the increment of the headward erosion is related to the postglacial climatic conditions and a coetaneous deepening of the Limay river channel, a process expressed by modern and lower erosion terraces. Moreover the retrograde erosion was enhanced by the special location of the Limay Chico valley along an important line of structural weakness, the Limay Chico fault. The fluvial capture and the consequent diversion of the Alicurá basin upper part showed previous favorable conditions: 1) the topographic lower disposition of Limay Chico stream and their base level; 2) its steeper slope and the location of Limay Chico valley along a zone of structural and litologicalk weakness; 3) transverse arrangement of the Alicurá river's headwaters; 4) its gentle slope and location of their basin and base level at a topographic higher level. Several wind gaps were recognized and were interpreted two probable elbows of capture and barbed pattern. Also the increment of discharge of Limay Chico stream caused in their basin local phenomena of static rejuvenation. It is suppose a close genetic relation between the landslides observed along the steep fault scarp promoted by the Limay Chico Fault and the postglacial climatic change and the local erosional deepening of Limay Chico valley. The slumps characterized by the coalescence of their scan, generated the irregular and ruged landscape of the western side of Limay Chico valley. On the eastern valley slope the slumps reach minor expression. Longitudinal profils and slopes of the analized streams are included. |
format |
JOUR |
author |
González Díaz, E.F. Castro Godoy, S. |
author_facet |
González Díaz, E.F. Castro Godoy, S. |
author_sort |
González Díaz, E.F. |
title |
Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
title_short |
Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
title_full |
Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
title_fullStr |
Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
title_full_unstemmed |
Limay Chico stream: An example of fluvial capture in the upper basin of the Limay River (SE of Neuquén) |
title_sort |
limay chico stream: an example of fluvial capture in the upper basin of the limay river (se of neuquén) |
url |
http://hdl.handle.net/20.500.12110/paper_00044822_v63_n1_p76_GonzalezDiaz |
work_keys_str_mv |
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