Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes

Climate changes related to orographic barrier uplift have been in the research spotlight over recent years. Several works have focused on the interactions between climatic and tectonic processes in order to understand the development of a rain shadow. Patagonia is an ideal region in which to analyze...

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Autores principales: Bucher, Joaquín, Varela, Augusto Nicolás, D'Elia, Leandro, Bilmes, Andrés, López, Manuel, García, Micaela Romina, Franzese, Juan Rafael
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Naturales
Geología
rain shadow
paleosols
paleoprecipitation
Patagonian Andes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131104
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131104
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Geología
rain shadow
paleosols
paleoprecipitation
Patagonian Andes
spellingShingle Ciencias Naturales
Geología
rain shadow
paleosols
paleoprecipitation
Patagonian Andes
Bucher, Joaquín
Varela, Augusto Nicolás
D'Elia, Leandro
Bilmes, Andrés
López, Manuel
García, Micaela Romina
Franzese, Juan Rafael
Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
topic_facet Ciencias Naturales
Geología
rain shadow
paleosols
paleoprecipitation
Patagonian Andes
description Climate changes related to orographic barrier uplift have been in the research spotlight over recent years. Several works have focused on the interactions between climatic and tectonic processes in order to understand the development of a rain shadow. Patagonia is an ideal region in which to analyze such interactions, since a Miocene climate change, from wetter to drier conditions, has mainly been associated with Andean uplift. In this work, we analyzed a succession of stacked paleosols recorded in a Miocene North Patagonian foreland basin in order to understand how the paleosol moisture regime related to the atmospheric humidity changes caused by the uplift of the Patagonian Andes. Based on macromorphological, micromorphological, and geochemical studies, and supported by a high-resolution chronostratigraphic scheme based on U-Pb geochronology and magnetostratigraphy, the paleosols were characterized with corresponding mean annual paleoprecipitation (MAP) and mean annual temperature values. Alfisol-like paleosols were identified at the base of the foreland infill (15–14.6 Ma) with a MAP of 1229 ± 108 mm/yr. The Andisol-like paleosols recognized in the middle section of the sequence (14.6–12.75 Ma) exhibited a MAP of 1053 ± 108 mm/yr, whereas the Aridisol-like paleosols occurring in the upper section of the infill (12.75–11.5 Ma) presented a MAP of 677 ± 108 mm/yr. The determined Miocene mean annual temperatures (∼11 ± 2.1 °C) were similar to the present-day values (11 °C). Based on the complete tectonic record of the Patagonian Andes, the observed decrease in MAP was assigned to the rain shadow effect created by the uplift of the North Patagonian Andes. Results indicate that although the process started around 19 Ma, the rain shadow effect was not effectively recorded before ca. 14.6 Ma.
format Articulo
Articulo
author Bucher, Joaquín
Varela, Augusto Nicolás
D'Elia, Leandro
Bilmes, Andrés
López, Manuel
García, Micaela Romina
Franzese, Juan Rafael
author_facet Bucher, Joaquín
Varela, Augusto Nicolás
D'Elia, Leandro
Bilmes, Andrés
López, Manuel
García, Micaela Romina
Franzese, Juan Rafael
author_sort Bucher, Joaquín
title Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
title_short Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
title_full Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
title_fullStr Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
title_full_unstemmed Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
title_sort multiproxy paleosol evidence for a rain shadow effect linked to miocene uplift of the north patagonian andes
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/131104
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