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

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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 richne...

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Detalles Bibliográficos
Autores principales: Palazzesi, Luis, Barreda, Viviana Dora, Cuitiño, José Ignacio, Guler, Maria Veronica, Tellería, María Cristina, Ventura Santos, R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Paleontología
Miocene
Palynology
Desertification
Patagonia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/95476
https://ri.conicet.gov.ar/11336/7533
http://www.nature.com/articles/ncomms4558
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-95476
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Miocene
Palynology
Desertification
Patagonia
spellingShingle Paleontología
Miocene
Palynology
Desertification
Patagonia
Palazzesi, Luis
Barreda, Viviana Dora
Cuitiño, José Ignacio
Guler, Maria Veronica
Tellería, María Cristina
Ventura Santos, R.
Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
topic_facet Paleontología
Miocene
Palynology
Desertification
Patagonia
description 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.
format Articulo
Articulo
author Palazzesi, Luis
Barreda, Viviana Dora
Cuitiño, José Ignacio
Guler, Maria Veronica
Tellería, María Cristina
Ventura Santos, R.
author_facet Palazzesi, Luis
Barreda, Viviana Dora
Cuitiño, José Ignacio
Guler, Maria Veronica
Tellería, María Cristina
Ventura Santos, R.
author_sort Palazzesi, Luis
title Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
title_short Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
title_full Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
title_fullStr Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
title_full_unstemmed Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift
title_sort fossil pollen records indicate that patagonian desertification was not solely a consequence of andean uplift
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/95476
https://ri.conicet.gov.ar/11336/7533
http://www.nature.com/articles/ncomms4558
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