气候变化领域集成服务门户(CCPortal): Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes

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DOI	10.1130/B35331.1
	Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes
	Bucher J.; Varela A.; D'Elia L.; Bilmes A.; López M.; García M.; Franzese J.
发表日期	2020
ISSN	167606
起始页码	1603
结束页码	1614
卷号	132 期号:2021-07-08
英文摘要	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. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184762
作者单位	Centro de Investigaciones Geológicas, Universidad Nacional de La Plata-CONICET, Diagonal 113 275, La Plata, 1900, Argentina; Cátedra de Micromorfología de Suelos, Facultad de Ciencias Naturales y Museo-Universidad Nacional de La Plata, Calle 122 y 60 s/n, La Plata, 1900, Argentina; Y-TEC S.A., Avenida del Petróleo s/n, Berisso, Buenos Aires, 1923, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, 1900, Argentina; Instituto Patagónico de Geología y Paleontología (CONICET), Boulevard Brown 2915, Puerto Madryn, U9120ACD, Argentina
推荐引用方式 GB/T 7714	Bucher J.,Varela A.,D'Elia L.,et al. Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes[J],2020,132(2021-07-08).
APA	Bucher J..,Varela A..,D'Elia L..,Bilmes A..,López M..,...&Franzese J..(2020).Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes.Bulletin of the Geological Society of America,132(2021-07-08).
MLA	Bucher J.,et al."Multiproxy paleosol evidence for a rain shadow effect linked to Miocene uplift of the North Patagonian Andes".Bulletin of the Geological Society of America 132.2021-07-08(2020).