Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina
The Jáchal River Valley displays a number of significant Holocene sedimentary accumulations made up of fine-grained materials. These deposits are interpreted as the sedimentary infill of shallow temporary lakes that were generated by slow growing episodes of alluvial fans that obstructed the Jáchal...
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todo:paper_08959811_v28_n3_p229_Colombo2023-10-03T15:42:51Z Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina Colombo, F. Busquets, P. Sole de Porta, N. Limarino, C.O. Heredia, N. Rodriguez-Fernandez, L.R. Alvarez-Marron, J. Argentina Dating Holocene Lacustrine system Palinology accumulation rate alluvial fan aridity climate variation El Nino-Southern Oscillation Holocene humid environment intramontane basin lacustrine deposit landscape evolution paleoclimate paleoenvironment paleolimnology sedimentary sequence sedimentation vegetation history Argentina Jachal River Precordillera San Juan [Argentina] South America Gastropoda Poaceae The Jáchal River Valley displays a number of significant Holocene sedimentary accumulations made up of fine-grained materials. These deposits are interpreted as the sedimentary infill of shallow temporary lakes that were generated by slow growing episodes of alluvial fans that obstructed the Jáchal River Valley. The association of fossil remains through the Holocene sedimentary sequence suggests that the accumulation of lacustrine sediments was affected by climate variations. The predominant aridity was punctuated by very few humid episodes characterised by fresh-water gastropoda and the intercalations of muddy sediments. The high proportion of charcoal particles in some samples indicates periodic forest fires. Abundant non-pollen forest remains suggest that an open zone dominated by several types of grasses underwent a dry season during part of the year. The palynomorph associations found in the Jáchal River Valley Holocene lacustrine sediments suggest that the humid conditions were less intense than those in the San Juan River Valley located more than one hundred kilometres southwards. Our study suggests that lake formation could have been controlled by climate oscillation probably related to the ENSO variation at 30° south latitude. © 2009 Elsevier Ltd. All rights reserved. Fil:Limarino, C.O. 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_08959811_v28_n3_p229_Colombo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Dating Holocene Lacustrine system Palinology accumulation rate alluvial fan aridity climate variation El Nino-Southern Oscillation Holocene humid environment intramontane basin lacustrine deposit landscape evolution paleoclimate paleoenvironment paleolimnology sedimentary sequence sedimentation vegetation history Argentina Jachal River Precordillera San Juan [Argentina] South America Gastropoda Poaceae |
| spellingShingle |
Argentina Dating Holocene Lacustrine system Palinology accumulation rate alluvial fan aridity climate variation El Nino-Southern Oscillation Holocene humid environment intramontane basin lacustrine deposit landscape evolution paleoclimate paleoenvironment paleolimnology sedimentary sequence sedimentation vegetation history Argentina Jachal River Precordillera San Juan [Argentina] South America Gastropoda Poaceae Colombo, F. Busquets, P. Sole de Porta, N. Limarino, C.O. Heredia, N. Rodriguez-Fernandez, L.R. Alvarez-Marron, J. Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| topic_facet |
Argentina Dating Holocene Lacustrine system Palinology accumulation rate alluvial fan aridity climate variation El Nino-Southern Oscillation Holocene humid environment intramontane basin lacustrine deposit landscape evolution paleoclimate paleoenvironment paleolimnology sedimentary sequence sedimentation vegetation history Argentina Jachal River Precordillera San Juan [Argentina] South America Gastropoda Poaceae |
| description |
The Jáchal River Valley displays a number of significant Holocene sedimentary accumulations made up of fine-grained materials. These deposits are interpreted as the sedimentary infill of shallow temporary lakes that were generated by slow growing episodes of alluvial fans that obstructed the Jáchal River Valley. The association of fossil remains through the Holocene sedimentary sequence suggests that the accumulation of lacustrine sediments was affected by climate variations. The predominant aridity was punctuated by very few humid episodes characterised by fresh-water gastropoda and the intercalations of muddy sediments. The high proportion of charcoal particles in some samples indicates periodic forest fires. Abundant non-pollen forest remains suggest that an open zone dominated by several types of grasses underwent a dry season during part of the year. The palynomorph associations found in the Jáchal River Valley Holocene lacustrine sediments suggest that the humid conditions were less intense than those in the San Juan River Valley located more than one hundred kilometres southwards. Our study suggests that lake formation could have been controlled by climate oscillation probably related to the ENSO variation at 30° south latitude. © 2009 Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Colombo, F. Busquets, P. Sole de Porta, N. Limarino, C.O. Heredia, N. Rodriguez-Fernandez, L.R. Alvarez-Marron, J. |
| author_facet |
Colombo, F. Busquets, P. Sole de Porta, N. Limarino, C.O. Heredia, N. Rodriguez-Fernandez, L.R. Alvarez-Marron, J. |
| author_sort |
Colombo, F. |
| title |
Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| title_short |
Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| title_full |
Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| title_fullStr |
Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| title_full_unstemmed |
Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina |
| title_sort |
holocene intramontane lake development: a new model in the jáchal river valley, andean precordillera, san juan, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_08959811_v28_n3_p229_Colombo |
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