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Title

Holocene intramontane lake development: A new model in the Jáchal River Valley, Andean Precordillera, San Juan, Argentina

AuthorsColombo Piñol, Ferrán; Busquets, Pedro; Solé de Porta, Nuria; Limarino, Carlos Oscar; Heredia, Nemesio; Rodriguez-Fernandez, Luis Roberto; Alvarez-Marrón, Joaquina
KeywordsLacustrine system
Dating
Palinology
Holocene
Argentina
Issue DateOct-2009
PublisherElsevier
CitationJournal of South American Earth Sciences 28(3): 229-238(2009)
AbstractThe 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.
Publisher version (URL)http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDS-4VVR1VB-3&_user=145085&_coverDate=10%2F31%2F2009&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000012098&_version=1&_urlVersion=0&_userid=145085&md5=cd38bb4f5cbff75698f4ed52dea0bb90
URIhttp://hdl.handle.net/10261/20450
DOI10.1016/j.jsames.2009.03.002
ISSN0895-9811
Appears in Collections:(ICTJA) Artículos
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