Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina

We present a climatic reconstruction of Holocene lacustrine episodes in the Salinas del Bebedero basin (Argentina), based on geological and diatom information. Morphological, sedimentological and diatom evidence between 11 600 ± 140 yr BP and 325 ± 95 yr BP, allowed us to interpret the paleoenvironm...

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Autores principales: González, M.A., Maidana, N.I.
Formato: JOUR
Materias:
Argentina
Brackish water
Diatom assemblages
Holocene
Paleoclimatology
Paleoenvironments
Paleolimnology
diatom
paleoenvironment
Quaternary
Cyclotella choctawatcheeana
Epithemia
Fragilaria
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09212728_v20_n4_p353_Gonzalez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09212728_v20_n4_p353_Gonzalez
record_format dspace
spelling todo:paper_09212728_v20_n4_p353_Gonzalez2023-10-03T15:45:01Z Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina González, M.A. Maidana, N.I. Argentina Brackish water Diatom assemblages Holocene Paleoclimatology Paleoenvironments Paleolimnology diatom paleoenvironment Quaternary Argentina Cyclotella choctawatcheeana Epithemia Fragilaria We present a climatic reconstruction of Holocene lacustrine episodes in the Salinas del Bebedero basin (Argentina), based on geological and diatom information. Morphological, sedimentological and diatom evidence between 11 600 ± 140 yr BP and 325 ± 95 yr BP, allowed us to interpret the paleoenvironments of the basin. Episodes of high energy (sandy levels) are linked to large inflow of meltwater through the Desaguadero River, related to development of glaciers on the Andes. This inflow is characterized by peaks of relative abundance of the brackish water diatom Cyclotella choctawatcheeana Prasad. The values of C. choctawatcheeana decrease in deposits of low energy (clay levels), where it co-dominates with oligohalobous Fragilaria and Epithemia spp. To the last two peaks of large inflow of meltwater, radiocarbon dates corrected to sidereal ages, are AD 1280/1420 and AD 1443/1656. These ages agree with two cold episodes clearly recorded in dendrological studies from the Patagonian Andes and were correlated to the Little Ice Age. Thus, older Holocene episodes of large inflow of water to the basin were correlated with the Neoglacial Advances defined by Mercer (1976) for the Andes. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09212728_v20_n4_p353_Gonzalez
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
Brackish water
Diatom assemblages
Holocene
Paleoclimatology
Paleoenvironments
Paleolimnology
diatom
paleoenvironment
Quaternary
Argentina
Cyclotella choctawatcheeana
Epithemia
Fragilaria
spellingShingle Argentina
Brackish water
Diatom assemblages
Holocene
Paleoclimatology
Paleoenvironments
Paleolimnology
diatom
paleoenvironment
Quaternary
Argentina
Cyclotella choctawatcheeana
Epithemia
Fragilaria
González, M.A.
Maidana, N.I.
Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
topic_facet Argentina
Brackish water
Diatom assemblages
Holocene
Paleoclimatology
Paleoenvironments
Paleolimnology
diatom
paleoenvironment
Quaternary
Argentina
Cyclotella choctawatcheeana
Epithemia
Fragilaria
description We present a climatic reconstruction of Holocene lacustrine episodes in the Salinas del Bebedero basin (Argentina), based on geological and diatom information. Morphological, sedimentological and diatom evidence between 11 600 ± 140 yr BP and 325 ± 95 yr BP, allowed us to interpret the paleoenvironments of the basin. Episodes of high energy (sandy levels) are linked to large inflow of meltwater through the Desaguadero River, related to development of glaciers on the Andes. This inflow is characterized by peaks of relative abundance of the brackish water diatom Cyclotella choctawatcheeana Prasad. The values of C. choctawatcheeana decrease in deposits of low energy (clay levels), where it co-dominates with oligohalobous Fragilaria and Epithemia spp. To the last two peaks of large inflow of meltwater, radiocarbon dates corrected to sidereal ages, are AD 1280/1420 and AD 1443/1656. These ages agree with two cold episodes clearly recorded in dendrological studies from the Patagonian Andes and were correlated to the Little Ice Age. Thus, older Holocene episodes of large inflow of water to the basin were correlated with the Neoglacial Advances defined by Mercer (1976) for the Andes.
format JOUR
author González, M.A.
Maidana, N.I.
author_facet González, M.A.
Maidana, N.I.
author_sort González, M.A.
title Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
title_short Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
title_full Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
title_fullStr Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
title_full_unstemmed Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina
title_sort post-wisconsinian paleoenvironments at salinas del bebedero basin, san luis, argentina
url http://hdl.handle.net/20.500.12110/paper_09212728_v20_n4_p353_Gonzalez
work_keys_str_mv AT gonzalezma postwisconsinianpaleoenvironmentsatsalinasdelbebederobasinsanluisargentina
AT maidanani postwisconsinianpaleoenvironmentsatsalinasdelbebederobasinsanluisargentina
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