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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1998
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09212728_v20_n4_p353_Gonzalez http://hdl.handle.net/20.500.12110/paper_09212728_v20_n4_p353_Gonzalez |
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paper:paper_09212728_v20_n4_p353_Gonzalez2023-06-08T15:50:17Z Post-Wisconsinian paleoenvironments at salinas del Bebedero basin, San Luis, Argentina 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. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09212728_v20_n4_p353_Gonzalez 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 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. |
| 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 |
| publishDate |
1998 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09212728_v20_n4_p353_Gonzalez http://hdl.handle.net/20.500.12110/paper_09212728_v20_n4_p353_Gonzalez |
| _version_ |
1768542795215142912 |