Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation

Autores
Bucher, Joaquin; Bilmes, Andrés; D'Elia, Leandro; López, Manuel; García, Micaela Romina; Varela, Augusto Nicolás; Franzese, Juan
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The relationships between climate and tectonic processes are in the geoscience spotlight during last years. The uplifting of a mountain range may constitute a topographic barrier to atmospheric circulation, thus producing the generation of an orographic rain shadow capable of driving important climatic and ecological changes. The link between these coupled tectonic and climatic processes has been analysed in several regions of the world, specifically related to the Himalaya and Andean chains uplift.As for the Andean chain, a main phase of orogenic growth occurred during the Miocene, configuring several Andean segments. Some Andean segments were widely analysed, and tectonically controlled climate changes were established. For instance, several works indicate that, during late Miocene times, the orographic uplift of the Central Andes triggered meaningful climatic changes, from wet to dryer conditions. Another Andean segments as the Southern Andes remain less understood in terms of tectonic climate interactions, and only a few semi-quantitative approaches were addressed for the past 20 Ma. In this work, we analyzed a continuous palaeosols succession recorded in a North Patagonian Miocene foreland basin in order to understand the moisture regime changes in response to the uplifting of the Patagonian Andes.Based on macromorphological, micromorphological and geochemical analysis, supported with a high-resolution time scheme, the palaeosols were characterized with their corresponding Mean Annual Paleoprecipitation (MAP) and Mean Annual Temperature (MAT) values. Alfisol-like palaeosols were identified at the base of the foreland infill (15-14.6 Ma) with MAP of 1229 ± 108 mm/yr. Andisol-like palaeosols were recognized in the middle section of the sequence (14.6-12.75 Ma) with MAP of 1056 ± 108 mm/yr, whereas Aridisol-like palaeosolslocalized at the top of the infill (12.75-11.5 Ma) presented MAP of 677 ± 108 mm/yr. Mean Annual Temperatures has not meaningfully changed since the Miocene (~11 ± 2.1°C) to the present (11°C).These data indicate a continuous decrease in MAP (greater than 600 mm/yr) and stable to slightly decrease in MAT between 15 to 11.5 Ma for the North Patagonian extra Andean region. The decrease in the rainfalls may be related to the growth and uplift of the Patagonian Andes and the rain shadow generation. The results indicate that although the Patagonian Andes started the uplift around 19 Ma, a time-delay of ~4 Myr with the rain shadow generation occurred, and the rain shadow effects were effectively recorded since ∽14.6 Ma. Therefore, during the first phase of mountain growth, the North Patagonian Andes were not high enough to generate a recordable rain shadow effect.
Fil: Bucher, Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Bilmes, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: D'Elia, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: López, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: García, Micaela Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Varela, Augusto Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Franzese, Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
25th Latin-American Colloquium of Geoscience
Hamburgo
Alemania
Universitat Hamburg
Materia
TECTONICS
OROGRAPHIC RAIN
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/202859
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generationBucher, JoaquinBilmes, AndrésD'Elia, LeandroLópez, ManuelGarcía, Micaela RominaVarela, Augusto NicolásFranzese, JuanTECTONICSOROGRAPHIC RAINhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The relationships between climate and tectonic processes are in the geoscience spotlight during last years. The uplifting of a mountain range may constitute a topographic barrier to atmospheric circulation, thus producing the generation of an orographic rain shadow capable of driving important climatic and ecological changes. The link between these coupled tectonic and climatic processes has been analysed in several regions of the world, specifically related to the Himalaya and Andean chains uplift.As for the Andean chain, a main phase of orogenic growth occurred during the Miocene, configuring several Andean segments. Some Andean segments were widely analysed, and tectonically controlled climate changes were established. For instance, several works indicate that, during late Miocene times, the orographic uplift of the Central Andes triggered meaningful climatic changes, from wet to dryer conditions. Another Andean segments as the Southern Andes remain less understood in terms of tectonic climate interactions, and only a few semi-quantitative approaches were addressed for the past 20 Ma. In this work, we analyzed a continuous palaeosols succession recorded in a North Patagonian Miocene foreland basin in order to understand the moisture regime changes in response to the uplifting of the Patagonian Andes.Based on macromorphological, micromorphological and geochemical analysis, supported with a high-resolution time scheme, the palaeosols were characterized with their corresponding Mean Annual Paleoprecipitation (MAP) and Mean Annual Temperature (MAT) values. Alfisol-like palaeosols were identified at the base of the foreland infill (15-14.6 Ma) with MAP of 1229 ± 108 mm/yr. Andisol-like palaeosols were recognized in the middle section of the sequence (14.6-12.75 Ma) with MAP of 1056 ± 108 mm/yr, whereas Aridisol-like palaeosolslocalized at the top of the infill (12.75-11.5 Ma) presented MAP of 677 ± 108 mm/yr. Mean Annual Temperatures has not meaningfully changed since the Miocene (~11 ± 2.1°C) to the present (11°C).These data indicate a continuous decrease in MAP (greater than 600 mm/yr) and stable to slightly decrease in MAT between 15 to 11.5 Ma for the North Patagonian extra Andean region. The decrease in the rainfalls may be related to the growth and uplift of the Patagonian Andes and the rain shadow generation. The results indicate that although the Patagonian Andes started the uplift around 19 Ma, a time-delay of ~4 Myr with the rain shadow generation occurred, and the rain shadow effects were effectively recorded since ∽14.6 Ma. Therefore, during the first phase of mountain growth, the North Patagonian Andes were not high enough to generate a recordable rain shadow effect.Fil: Bucher, Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Bilmes, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: D'Elia, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: López, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: García, Micaela Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Varela, Augusto Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Franzese, Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina25th Latin-American Colloquium of GeoscienceHamburgoAlemaniaUniversitat HamburgSchriften GeoUnion Alfred Wegener-StiftungRiller, UllrichGöllner, Paul2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectOtroJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/202859Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation; 25th Latin-American Colloquium of Geoscience; Hamburgo; Alemania; 2019; 34-340946-8978CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://e-docs.geo-leo.de/handle/11858/7935info:eu-repo/semantics/altIdentifier/url/https://doi.org/10.23689/fidgeo-3609Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:43:41Zoai:ri.conicet.gov.ar:11336/202859instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:43:41.427CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
title Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
spellingShingle Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
Bucher, Joaquin
TECTONICS
OROGRAPHIC RAIN
title_short Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
title_full Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
title_fullStr Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
title_full_unstemmed Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
title_sort Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation
dc.creator.none.fl_str_mv Bucher, Joaquin
Bilmes, Andrés
D'Elia, Leandro
López, Manuel
García, Micaela Romina
Varela, Augusto Nicolás
Franzese, Juan
author Bucher, Joaquin
author_facet Bucher, Joaquin
Bilmes, Andrés
D'Elia, Leandro
López, Manuel
García, Micaela Romina
Varela, Augusto Nicolás
Franzese, Juan
author_role author
author2 Bilmes, Andrés
D'Elia, Leandro
López, Manuel
García, Micaela Romina
Varela, Augusto Nicolás
Franzese, Juan
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Riller, Ullrich
Göllner, Paul
dc.subject.none.fl_str_mv TECTONICS
OROGRAPHIC RAIN
topic TECTONICS
OROGRAPHIC RAIN
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The relationships between climate and tectonic processes are in the geoscience spotlight during last years. The uplifting of a mountain range may constitute a topographic barrier to atmospheric circulation, thus producing the generation of an orographic rain shadow capable of driving important climatic and ecological changes. The link between these coupled tectonic and climatic processes has been analysed in several regions of the world, specifically related to the Himalaya and Andean chains uplift.As for the Andean chain, a main phase of orogenic growth occurred during the Miocene, configuring several Andean segments. Some Andean segments were widely analysed, and tectonically controlled climate changes were established. For instance, several works indicate that, during late Miocene times, the orographic uplift of the Central Andes triggered meaningful climatic changes, from wet to dryer conditions. Another Andean segments as the Southern Andes remain less understood in terms of tectonic climate interactions, and only a few semi-quantitative approaches were addressed for the past 20 Ma. In this work, we analyzed a continuous palaeosols succession recorded in a North Patagonian Miocene foreland basin in order to understand the moisture regime changes in response to the uplifting of the Patagonian Andes.Based on macromorphological, micromorphological and geochemical analysis, supported with a high-resolution time scheme, the palaeosols were characterized with their corresponding Mean Annual Paleoprecipitation (MAP) and Mean Annual Temperature (MAT) values. Alfisol-like palaeosols were identified at the base of the foreland infill (15-14.6 Ma) with MAP of 1229 ± 108 mm/yr. Andisol-like palaeosols were recognized in the middle section of the sequence (14.6-12.75 Ma) with MAP of 1056 ± 108 mm/yr, whereas Aridisol-like palaeosolslocalized at the top of the infill (12.75-11.5 Ma) presented MAP of 677 ± 108 mm/yr. Mean Annual Temperatures has not meaningfully changed since the Miocene (~11 ± 2.1°C) to the present (11°C).These data indicate a continuous decrease in MAP (greater than 600 mm/yr) and stable to slightly decrease in MAT between 15 to 11.5 Ma for the North Patagonian extra Andean region. The decrease in the rainfalls may be related to the growth and uplift of the Patagonian Andes and the rain shadow generation. The results indicate that although the Patagonian Andes started the uplift around 19 Ma, a time-delay of ~4 Myr with the rain shadow generation occurred, and the rain shadow effects were effectively recorded since ∽14.6 Ma. Therefore, during the first phase of mountain growth, the North Patagonian Andes were not high enough to generate a recordable rain shadow effect.
Fil: Bucher, Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Bilmes, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: D'Elia, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: López, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: García, Micaela Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Varela, Augusto Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Franzese, Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
25th Latin-American Colloquium of Geoscience
Hamburgo
Alemania
Universitat Hamburg
description The relationships between climate and tectonic processes are in the geoscience spotlight during last years. The uplifting of a mountain range may constitute a topographic barrier to atmospheric circulation, thus producing the generation of an orographic rain shadow capable of driving important climatic and ecological changes. The link between these coupled tectonic and climatic processes has been analysed in several regions of the world, specifically related to the Himalaya and Andean chains uplift.As for the Andean chain, a main phase of orogenic growth occurred during the Miocene, configuring several Andean segments. Some Andean segments were widely analysed, and tectonically controlled climate changes were established. For instance, several works indicate that, during late Miocene times, the orographic uplift of the Central Andes triggered meaningful climatic changes, from wet to dryer conditions. Another Andean segments as the Southern Andes remain less understood in terms of tectonic climate interactions, and only a few semi-quantitative approaches were addressed for the past 20 Ma. In this work, we analyzed a continuous palaeosols succession recorded in a North Patagonian Miocene foreland basin in order to understand the moisture regime changes in response to the uplifting of the Patagonian Andes.Based on macromorphological, micromorphological and geochemical analysis, supported with a high-resolution time scheme, the palaeosols were characterized with their corresponding Mean Annual Paleoprecipitation (MAP) and Mean Annual Temperature (MAT) values. Alfisol-like palaeosols were identified at the base of the foreland infill (15-14.6 Ma) with MAP of 1229 ± 108 mm/yr. Andisol-like palaeosols were recognized in the middle section of the sequence (14.6-12.75 Ma) with MAP of 1056 ± 108 mm/yr, whereas Aridisol-like palaeosolslocalized at the top of the infill (12.75-11.5 Ma) presented MAP of 677 ± 108 mm/yr. Mean Annual Temperatures has not meaningfully changed since the Miocene (~11 ± 2.1°C) to the present (11°C).These data indicate a continuous decrease in MAP (greater than 600 mm/yr) and stable to slightly decrease in MAT between 15 to 11.5 Ma for the North Patagonian extra Andean region. The decrease in the rainfalls may be related to the growth and uplift of the Patagonian Andes and the rain shadow generation. The results indicate that although the Patagonian Andes started the uplift around 19 Ma, a time-delay of ~4 Myr with the rain shadow generation occurred, and the rain shadow effects were effectively recorded since ∽14.6 Ma. Therefore, during the first phase of mountain growth, the North Patagonian Andes were not high enough to generate a recordable rain shadow effect.
publishDate 2019
dc.date.none.fl_str_mv 2019
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info:eu-repo/semantics/conferenceObject
Otro
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/202859
Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation; 25th Latin-American Colloquium of Geoscience; Hamburgo; Alemania; 2019; 34-34
0946-8978
CONICET Digital
CONICET
url http://hdl.handle.net/11336/202859
identifier_str_mv Tectonic and climatic coupled processes in north patagonian andes: Miocene orographic barrier uplift and rain shadow generation; 25th Latin-American Colloquium of Geoscience; Hamburgo; Alemania; 2019; 34-34
0946-8978
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/url/https://doi.org/10.23689/fidgeo-3609
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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application/pdf
application/pdf
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Schriften GeoUnion Alfred Wegener-Stiftung
publisher.none.fl_str_mv Schriften GeoUnion Alfred Wegener-Stiftung
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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reponame_str CONICET Digital (CONICET)
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repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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