Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)

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The Paleocene-Eocene boundary was a period of transient and intense global warming that had a deep effect on middle and high latitude plant groups. Nevertheless, only scarce early Paleogene paleoclimatic records are known from the South American continental sequences deposited at these latitudes. In...

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Autores principales: Raigemborn, María Sol, Brea, Mariana, Zucol, Alejandro F., Matheos, Sergio Daniel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Paleontología
Geología
Clay minerals
Fossil woods
Paleocene-eocene
Paleoclimatic proxies
Phytoliths
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/95715
https://ri.conicet.gov.ar/11336/74445
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000269
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-95715
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Geología
Clay minerals
Fossil woods
Paleocene-eocene
Paleoclimatic proxies
Phytoliths
spellingShingle Paleontología
Geología
Clay minerals
Fossil woods
Paleocene-eocene
Paleoclimatic proxies
Phytoliths
Raigemborn, María Sol
Brea, Mariana
Zucol, Alejandro F.
Matheos, Sergio Daniel
Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
topic_facet Paleontología
Geología
Clay minerals
Fossil woods
Paleocene-eocene
Paleoclimatic proxies
Phytoliths
description The Paleocene-Eocene boundary was a period of transient and intense global warming that had a deep effect on middle and high latitude plant groups. Nevertheless, only scarce early Paleogene paleoclimatic records are known from the South American continental sequences deposited at these latitudes. In this contribution clay mineralogy and paleobotanical analyses (fossil woods and phytoliths) were used as paleoclimate proxies from the lower and middle parts of the Río Chico Group (Golfo San Jorge basin, Patagonia, Argentina). These new data may enable to understand the changing climatic conditions during part of the Paleocene-Eocene transition. In this setting, three clay mineral assemblages were identified: S1 assemblage (smectite) dominates the Peñas Coloradas Formation; S2 assemblage (smectite>kaolinite) occurs in the stratigraphic transition to the Las Flores Formation; and S3 assemblage (kaolinite>smectite) dominates the Las Flores Formation. These trend of change in the detrital clay mineral composition is interpreted as resulting mainly from the changing paleoclimatic conditions that shifted from seasonal warm temperate to tropical affecting the same source area lithology. Moreover, the paleobotanical data suggest that the Early Paleogene vegetation in the Golfo San Jorge basin underwent significant composition and diversity changes, ranging from mixed temperate - subtropical forest to mixed subtropical - tropical, humid forest. The integrated analysis of the clay mineral composition and the palaeobotanical assemblages suggests that, in central Argentinean Patagonia, the Paleocene-Eocene climate changed from temperate warm, humid and highly seasonal precipitation conditions to subtropical-tropical, more continuous year-round rainfall conditions.
format Articulo
Articulo
author Raigemborn, María Sol
Brea, Mariana
Zucol, Alejandro F.
Matheos, Sergio Daniel
author_facet Raigemborn, María Sol
Brea, Mariana
Zucol, Alejandro F.
Matheos, Sergio Daniel
author_sort Raigemborn, María Sol
title Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
title_short Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
title_full Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
title_fullStr Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
title_full_unstemmed Early Paleogene climate at mid latitude in South America : Mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina)
title_sort early paleogene climate at mid latitude in south america : mineralogical and paleobotanical proxies from continental sequences in golfo san jorge basin (patagonia, argentina)
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/95715
https://ri.conicet.gov.ar/11336/74445
http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000269
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