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Artículo

Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift

Palazzesi, LuisIcon ; Barreda, Viviana DoraIcon ; Cuitiño, José IgnacioIcon ; Guler, Maria VeronicaIcon ; Telleria, Maria CristinaIcon ; Ventura Santos, Roberto
Fecha de publicación: 04/2014
Editorial: Nature Publishing Group
Revista: Nature Communications
ISSN: 2041-1723
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

The Patagonian steppe—a massive rain-shadow on the lee side of the southern Andes—is assumed to have evolved ~15–12 Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant richness for the interval ~10–6 Myr based on the study and bioclimatic analysis of terrestrially derived spore–pollen assemblages preserved in well-constrained Patagonian marine deposits. Our analyses indicate a mesothermal climate, with mean temperatures of the coldest quarter between 11.4 °C and 16.9 °C (presently ~3.5 °C) and annual precipitation rarely below 661 mm (presently ~200 mm). Rarefied richness reveals a significantly more diverse flora during the late Miocene than today at the same latitude but comparable with that approximately 2,000 km further northeast at mid-latitudes on the Brazilian coast. We infer that the Patagonian desertification was not solely a consequence of the Andean uplift as previously insinuated.
Palabras clave: Miocene , Palynology , Desertification , Patagonia
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/7533
URL: http://www.nature.com/articles/ncomms4558
DOI: http://dx.doi.org/10.1038/ncomms4558
Colecciones
Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(INGEOSUR)
Articulos de INST.GEOLOGICO DEL SUR
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Palazzesi, Luis; Barreda, Viviana Dora; Cuitiño, José Ignacio; Guler, Maria Veronica; Telleria, Maria Cristina; et al.; Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift; Nature Publishing Group; Nature Communications; 5; 3558; 4-2014; 1-8
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