Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils
A succession of marine and continental strata on the southern flank of Cerro Cono in the Sierra Baguales, northeast of Torres del Paine, can be correlated with stratigraphic units exposed along the southern border of the Lago Argentino region in Santa Cruz Province, Argentina. These include the Esta...
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Servicio Nacional de Geología y Minería (SERNAGEOMIN)
2013
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oai:scielo:S0718-710620130003000042014-03-03Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossilsBostelmann,J. EnriqueLe Roux,Jacobus PVásquez,AnaGutiérrez,Néstor MOyarzún,José LuisCarreño,CatalinaTorres,TeresaOtero,RodrigoLlanos,AndreaFanning,C. MarkHervé,Francisco Burdigalian Santa Cruz Formation Santacrucian SALMA 'Notohippidian 'fauna Meandering rivers Andean uplift A succession of marine and continental strata on the southern flank of Cerro Cono in the Sierra Baguales, northeast of Torres del Paine, can be correlated with stratigraphic units exposed along the southern border of the Lago Argentino region in Santa Cruz Province, Argentina. These include the Estancia 25 de Mayo Formation and the basal part of the Santa Cruz Formation. The lithological correlation is also confirmed by detrital zircon ages (maximum age of 18.23±0.26 Ma) and a rich assemblage of terrestrial vertebrate fossils, biostratigraphically equivalent to a post-Colhuehuapian, pre-Santacrucian South American Land Mammal Age (SALMA) fauna, suggesting a range of 19 to 17.8 Ma. Similar ages have been obtained from the basal part of the Santa Cruz Formation at Estancia Quién Sabe in southwestern Argentina, supporting the assumption of a regional continuity between these deposits. A measured lithostratigraphic column is presented and the depositional environment is interpreted as a coastal plain with small, meandering rivers and ephemeral floodplain lakes. The sedimentation coincides with intensified uplift of the Patagonian Andes during the 'Quechua Phase' of Andean tectonism, which is reflected by a change in paleocurrent directions from northwest to east-northeast.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.40 n.3 20132013-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000300004en |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Burdigalian Santa Cruz Formation Santacrucian SALMA 'Notohippidian 'fauna Meandering rivers Andean uplift |
| spellingShingle |
Burdigalian Santa Cruz Formation Santacrucian SALMA 'Notohippidian 'fauna Meandering rivers Andean uplift Bostelmann,J. Enrique Le Roux,Jacobus P Vásquez,Ana Gutiérrez,Néstor M Oyarzún,José Luis Carreño,Catalina Torres,Teresa Otero,Rodrigo Llanos,Andrea Fanning,C. Mark Hervé,Francisco Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| description |
A succession of marine and continental strata on the southern flank of Cerro Cono in the Sierra Baguales, northeast of Torres del Paine, can be correlated with stratigraphic units exposed along the southern border of the Lago Argentino region in Santa Cruz Province, Argentina. These include the Estancia 25 de Mayo Formation and the basal part of the Santa Cruz Formation. The lithological correlation is also confirmed by detrital zircon ages (maximum age of 18.23±0.26 Ma) and a rich assemblage of terrestrial vertebrate fossils, biostratigraphically equivalent to a post-Colhuehuapian, pre-Santacrucian South American Land Mammal Age (SALMA) fauna, suggesting a range of 19 to 17.8 Ma. Similar ages have been obtained from the basal part of the Santa Cruz Formation at Estancia Quién Sabe in southwestern Argentina, supporting the assumption of a regional continuity between these deposits. A measured lithostratigraphic column is presented and the depositional environment is interpreted as a coastal plain with small, meandering rivers and ephemeral floodplain lakes. The sedimentation coincides with intensified uplift of the Patagonian Andes during the 'Quechua Phase' of Andean tectonism, which is reflected by a change in paleocurrent directions from northwest to east-northeast. |
| author |
Bostelmann,J. Enrique Le Roux,Jacobus P Vásquez,Ana Gutiérrez,Néstor M Oyarzún,José Luis Carreño,Catalina Torres,Teresa Otero,Rodrigo Llanos,Andrea Fanning,C. Mark Hervé,Francisco |
| author_facet |
Bostelmann,J. Enrique Le Roux,Jacobus P Vásquez,Ana Gutiérrez,Néstor M Oyarzún,José Luis Carreño,Catalina Torres,Teresa Otero,Rodrigo Llanos,Andrea Fanning,C. Mark Hervé,Francisco |
| author_sort |
Bostelmann,J. Enrique |
| title |
Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| title_short |
Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| title_full |
Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| title_fullStr |
Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| title_full_unstemmed |
Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |
| title_sort |
burdigalian deposits of the santa cruz formation in the sierra baguales, austral (magallanes) basin: age, depositional environment and vertebrate fossils |
| publisher |
Servicio Nacional de Geología y Minería (SERNAGEOMIN) |
| publishDate |
2013 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000300004 |
| work_keys_str_mv |
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| _version_ |
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