Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes)
We illustrate the results of geomorphological, stratigraphical and sedimentological analysis of the Tarija-Padcaya basin, a wide depression in the eastern side of the Bolivian Cordillera. The basin is well known for the rich mammal fauna discovered since the beginning of the 19th century. The sedime...
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ftunivsiena:oai:usiena-air.unisi.it:11365/4188 2024-04-14T08:13:01+00:00 Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) COLTORTI, M. PIERUCCINI, P. PAREDES RIOS, F. Coltorti, M. Pieruccini, P. PAREDES RIOS, F. 2010 STAMPA http://hdl.handle.net/11365/4188 https://doi.org/10.1016/j.pgeola.2010.04.002 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000279797600006 volume:121 issue:Special issue firstpage:162 lastpage:179 numberofpages:18 journal:PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION http://hdl.handle.net/11365/4188 doi:10.1016/j.pgeola.2010.04.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-77953689937 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2010 ftunivsiena https://doi.org/10.1016/j.pgeola.2010.04.002 2024-03-21T16:01:28Z We illustrate the results of geomorphological, stratigraphical and sedimentological analysis of the Tarija-Padcaya basin, a wide depression in the eastern side of the Bolivian Cordillera. The basin is well known for the rich mammal fauna discovered since the beginning of the 19th century. The sedimentary infilling belongs to the Tolomosa Formation, corresponding to a major synthem subdivided into three main sub-synthems, mostly made of fluvial and alluvial fan sediments locally weathered by paleoalfisols (Ancon Grande sub-synthem), glacial and fluvio-glacial sediments (Puente Phayo sub-synthem) and finally alluvial fan and alluvial plain sediments (San Jacinto sub-synthem). Radiocarbon dating provides a chronology for the last sub-synthem and testifies that the sequence encompasses the Last Interglacial-Glacial cycle and constitutes a good proxy record for Late Pleistocene climatic changes. The occurrence of glacial deposits in the deeper part of the sedimentary filling suggests a major ice advance during MIS 4 and, together with glacial geomorphological evidence, points to further glacial erosion during the Last Glacial Maximum (LGM). The importance of glacial deposition and erosion opens the question of correlation with the events reported in the nearby Altiplano, where glacial deposits have been recognized only along the slopes of the higher volcanoes. In the Altiplano the LGM has been claimed to be characterized by an absence of deposition or deep erosion, due to extreme dryness, but the Tarija record suggests an erosional event of a scale that would imply the occurrence of a large ice cap. © 2010 The Geologists' Association. Article in Journal/Newspaper Ice cap Università degli Studi di Siena: USiena air Altiplano The ENVELOPE(163.917,163.917,-78.133,-78.133) The Altiplano ENVELOPE(163.917,163.917,-78.133,-78.133) Proceedings of the Geologists' Association 121 2 162 179 |
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Open Polar |
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Università degli Studi di Siena: USiena air |
op_collection_id |
ftunivsiena |
language |
English |
description |
We illustrate the results of geomorphological, stratigraphical and sedimentological analysis of the Tarija-Padcaya basin, a wide depression in the eastern side of the Bolivian Cordillera. The basin is well known for the rich mammal fauna discovered since the beginning of the 19th century. The sedimentary infilling belongs to the Tolomosa Formation, corresponding to a major synthem subdivided into three main sub-synthems, mostly made of fluvial and alluvial fan sediments locally weathered by paleoalfisols (Ancon Grande sub-synthem), glacial and fluvio-glacial sediments (Puente Phayo sub-synthem) and finally alluvial fan and alluvial plain sediments (San Jacinto sub-synthem). Radiocarbon dating provides a chronology for the last sub-synthem and testifies that the sequence encompasses the Last Interglacial-Glacial cycle and constitutes a good proxy record for Late Pleistocene climatic changes. The occurrence of glacial deposits in the deeper part of the sedimentary filling suggests a major ice advance during MIS 4 and, together with glacial geomorphological evidence, points to further glacial erosion during the Last Glacial Maximum (LGM). The importance of glacial deposition and erosion opens the question of correlation with the events reported in the nearby Altiplano, where glacial deposits have been recognized only along the slopes of the higher volcanoes. In the Altiplano the LGM has been claimed to be characterized by an absence of deposition or deep erosion, due to extreme dryness, but the Tarija record suggests an erosional event of a scale that would imply the occurrence of a large ice cap. © 2010 The Geologists' Association. |
author2 |
Coltorti, M. Pieruccini, P. PAREDES RIOS, F. |
format |
Article in Journal/Newspaper |
author |
COLTORTI, M. PIERUCCINI, P. PAREDES RIOS, F. |
spellingShingle |
COLTORTI, M. PIERUCCINI, P. PAREDES RIOS, F. Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
author_facet |
COLTORTI, M. PIERUCCINI, P. PAREDES RIOS, F. |
author_sort |
COLTORTI, M. |
title |
Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
title_short |
Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
title_full |
Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
title_fullStr |
Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
title_full_unstemmed |
Late Pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the Tarija-Padcaya basin (Bolivian Andes) |
title_sort |
late pleistocene stratigraphy, sedimentology and paleoenvironmental evolution of the tarija-padcaya basin (bolivian andes) |
publishDate |
2010 |
url |
http://hdl.handle.net/11365/4188 https://doi.org/10.1016/j.pgeola.2010.04.002 |
long_lat |
ENVELOPE(163.917,163.917,-78.133,-78.133) ENVELOPE(163.917,163.917,-78.133,-78.133) |
geographic |
Altiplano The The Altiplano |
geographic_facet |
Altiplano The The Altiplano |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000279797600006 volume:121 issue:Special issue firstpage:162 lastpage:179 numberofpages:18 journal:PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION http://hdl.handle.net/11365/4188 doi:10.1016/j.pgeola.2010.04.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-77953689937 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.pgeola.2010.04.002 |
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Proceedings of the Geologists' Association |
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121 |
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162 |
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