Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records

Autores
Hren, Michael; Fennell, Lucas Martín; Brandon, Mark Thomas; Super, James; Colwyn, David
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Andes Mountains form the world?s longest continental mountain belt and their evolution has shaped global climate, weathering and biological systems. Numerous studies have quantified the topographic evolution of this range, yet there remains considerable debate over the timing and magnitude of change along the orogen. We analyzed the δ2H of plant-derived organic biomarkers, the δ2H of volcanic glass and the distribution of soil-derived glycerol dialkyl glycerol tetraethers from Cenozoic sediments preserved in basins between ~35° and 47°S. These data were analyzed to reconstruct spatiotemporal changes in precipitation isotopes and temperature on the eastern flank of the Southern Andes. Both variables (precipitation isotopes and temperature) are strongly related to the topography of an orogen through isotopic distillation of precipitation during rainout and changes in temperature with elevation. Importantly however, molecular biomarkers can also provide key information about climate and aridity, informing interpretation of isotope and temperature data through time. We show that organic biomarker and volcanic glass δ2H from the Malargüe basin (~35°S) in Argentina and several basins around ~47°S show comparable shifts in precipitation δ2H (~15-20?) from the early to late Cenozoic followed by an increase in δ2H values in the Mid-late Miocene associated with increased vapor pressure deficit and indicators of increased aridity. These independent records attest to the fidelity of the isotopic signals in organic and inorganic proxies and demonstrate that the observed change in hydrogen isotopes through the Cenozoic dominantly reflects a change in ambient water composition, not secondary processes that bias a single proxy. Large negative precipitation isotope values observed for early Cenozoic sedimentary basins between 35° and 47°S are consistent with isotopic distillation associated with a high orographic barrier along the Southern Andes at this time. Increases in reconstructed precipitation δ2H values on the eastern side of the orogen through the Cenozoic can be explained almost entirely by a change in the isotopic composition of precipitation related to Cenozoic changes in global climate and ocean temperature. In total, organic molecular and inorganic data indicate long-standing high topography in the Southern Central Andes since the beginning of the Cenozoic with evidence for mid-late Miocene drying, increased plant stress and a positive shift in precipitation isotopes.
Fil: Hren, Michael. University of Connecticut; Estados Unidos
Fil: Fennell, Lucas Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Brandon, Mark Thomas. University of Yale; Estados Unidos
Fil: Super, James. University of Yale; Estados Unidos
Fil: Colwyn, David. State University of Colorado at Boulder; Estados Unidos
Geological Society of America Annual Meeting
Estados Unidos
Geological Society of America
Materia
Tectonics
Climate
Isotopes
Organics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/178011

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spelling Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic recordsHren, MichaelFennell, Lucas MartínBrandon, Mark ThomasSuper, JamesColwyn, DavidTectonicsClimateIsotopesOrganicshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Andes Mountains form the world?s longest continental mountain belt and their evolution has shaped global climate, weathering and biological systems. Numerous studies have quantified the topographic evolution of this range, yet there remains considerable debate over the timing and magnitude of change along the orogen. We analyzed the δ2H of plant-derived organic biomarkers, the δ2H of volcanic glass and the distribution of soil-derived glycerol dialkyl glycerol tetraethers from Cenozoic sediments preserved in basins between ~35° and 47°S. These data were analyzed to reconstruct spatiotemporal changes in precipitation isotopes and temperature on the eastern flank of the Southern Andes. Both variables (precipitation isotopes and temperature) are strongly related to the topography of an orogen through isotopic distillation of precipitation during rainout and changes in temperature with elevation. Importantly however, molecular biomarkers can also provide key information about climate and aridity, informing interpretation of isotope and temperature data through time. We show that organic biomarker and volcanic glass δ2H from the Malargüe basin (~35°S) in Argentina and several basins around ~47°S show comparable shifts in precipitation δ2H (~15-20?) from the early to late Cenozoic followed by an increase in δ2H values in the Mid-late Miocene associated with increased vapor pressure deficit and indicators of increased aridity. These independent records attest to the fidelity of the isotopic signals in organic and inorganic proxies and demonstrate that the observed change in hydrogen isotopes through the Cenozoic dominantly reflects a change in ambient water composition, not secondary processes that bias a single proxy. Large negative precipitation isotope values observed for early Cenozoic sedimentary basins between 35° and 47°S are consistent with isotopic distillation associated with a high orographic barrier along the Southern Andes at this time. Increases in reconstructed precipitation δ2H values on the eastern side of the orogen through the Cenozoic can be explained almost entirely by a change in the isotopic composition of precipitation related to Cenozoic changes in global climate and ocean temperature. In total, organic molecular and inorganic data indicate long-standing high topography in the Southern Central Andes since the beginning of the Cenozoic with evidence for mid-late Miocene drying, increased plant stress and a positive shift in precipitation isotopes.Fil: Hren, Michael. University of Connecticut; Estados UnidosFil: Fennell, Lucas Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Brandon, Mark Thomas. University of Yale; Estados UnidosFil: Super, James. University of Yale; Estados UnidosFil: Colwyn, David. State University of Colorado at Boulder; Estados UnidosGeological Society of America Annual MeetingEstados UnidosGeological Society of AmericaGeological Society of America2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/178011Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records; Geological Society of America Annual Meeting; Estados Unidos; 2019; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://gsa.confex.com/gsa/2019AM/webprogram/Paper339170.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1130/abs/2019AM-339170Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:32:17Zoai:ri.conicet.gov.ar:11336/178011instacron: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 10:32:17.628CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
title Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
spellingShingle Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
Hren, Michael
Tectonics
Climate
Isotopes
Organics
title_short Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
title_full Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
title_fullStr Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
title_full_unstemmed Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
title_sort Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
dc.creator.none.fl_str_mv Hren, Michael
Fennell, Lucas Martín
Brandon, Mark Thomas
Super, James
Colwyn, David
author Hren, Michael
author_facet Hren, Michael
Fennell, Lucas Martín
Brandon, Mark Thomas
Super, James
Colwyn, David
author_role author
author2 Fennell, Lucas Martín
Brandon, Mark Thomas
Super, James
Colwyn, David
author2_role author
author
author
author
dc.subject.none.fl_str_mv Tectonics
Climate
Isotopes
Organics
topic Tectonics
Climate
Isotopes
Organics
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 Andes Mountains form the world?s longest continental mountain belt and their evolution has shaped global climate, weathering and biological systems. Numerous studies have quantified the topographic evolution of this range, yet there remains considerable debate over the timing and magnitude of change along the orogen. We analyzed the δ2H of plant-derived organic biomarkers, the δ2H of volcanic glass and the distribution of soil-derived glycerol dialkyl glycerol tetraethers from Cenozoic sediments preserved in basins between ~35° and 47°S. These data were analyzed to reconstruct spatiotemporal changes in precipitation isotopes and temperature on the eastern flank of the Southern Andes. Both variables (precipitation isotopes and temperature) are strongly related to the topography of an orogen through isotopic distillation of precipitation during rainout and changes in temperature with elevation. Importantly however, molecular biomarkers can also provide key information about climate and aridity, informing interpretation of isotope and temperature data through time. We show that organic biomarker and volcanic glass δ2H from the Malargüe basin (~35°S) in Argentina and several basins around ~47°S show comparable shifts in precipitation δ2H (~15-20?) from the early to late Cenozoic followed by an increase in δ2H values in the Mid-late Miocene associated with increased vapor pressure deficit and indicators of increased aridity. These independent records attest to the fidelity of the isotopic signals in organic and inorganic proxies and demonstrate that the observed change in hydrogen isotopes through the Cenozoic dominantly reflects a change in ambient water composition, not secondary processes that bias a single proxy. Large negative precipitation isotope values observed for early Cenozoic sedimentary basins between 35° and 47°S are consistent with isotopic distillation associated with a high orographic barrier along the Southern Andes at this time. Increases in reconstructed precipitation δ2H values on the eastern side of the orogen through the Cenozoic can be explained almost entirely by a change in the isotopic composition of precipitation related to Cenozoic changes in global climate and ocean temperature. In total, organic molecular and inorganic data indicate long-standing high topography in the Southern Central Andes since the beginning of the Cenozoic with evidence for mid-late Miocene drying, increased plant stress and a positive shift in precipitation isotopes.
Fil: Hren, Michael. University of Connecticut; Estados Unidos
Fil: Fennell, Lucas Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Brandon, Mark Thomas. University of Yale; Estados Unidos
Fil: Super, James. University of Yale; Estados Unidos
Fil: Colwyn, David. State University of Colorado at Boulder; Estados Unidos
Geological Society of America Annual Meeting
Estados Unidos
Geological Society of America
description The Andes Mountains form the world?s longest continental mountain belt and their evolution has shaped global climate, weathering and biological systems. Numerous studies have quantified the topographic evolution of this range, yet there remains considerable debate over the timing and magnitude of change along the orogen. We analyzed the δ2H of plant-derived organic biomarkers, the δ2H of volcanic glass and the distribution of soil-derived glycerol dialkyl glycerol tetraethers from Cenozoic sediments preserved in basins between ~35° and 47°S. These data were analyzed to reconstruct spatiotemporal changes in precipitation isotopes and temperature on the eastern flank of the Southern Andes. Both variables (precipitation isotopes and temperature) are strongly related to the topography of an orogen through isotopic distillation of precipitation during rainout and changes in temperature with elevation. Importantly however, molecular biomarkers can also provide key information about climate and aridity, informing interpretation of isotope and temperature data through time. We show that organic biomarker and volcanic glass δ2H from the Malargüe basin (~35°S) in Argentina and several basins around ~47°S show comparable shifts in precipitation δ2H (~15-20?) from the early to late Cenozoic followed by an increase in δ2H values in the Mid-late Miocene associated with increased vapor pressure deficit and indicators of increased aridity. These independent records attest to the fidelity of the isotopic signals in organic and inorganic proxies and demonstrate that the observed change in hydrogen isotopes through the Cenozoic dominantly reflects a change in ambient water composition, not secondary processes that bias a single proxy. Large negative precipitation isotope values observed for early Cenozoic sedimentary basins between 35° and 47°S are consistent with isotopic distillation associated with a high orographic barrier along the Southern Andes at this time. Increases in reconstructed precipitation δ2H values on the eastern side of the orogen through the Cenozoic can be explained almost entirely by a change in the isotopic composition of precipitation related to Cenozoic changes in global climate and ocean temperature. In total, organic molecular and inorganic data indicate long-standing high topography in the Southern Central Andes since the beginning of the Cenozoic with evidence for mid-late Miocene drying, increased plant stress and a positive shift in precipitation isotopes.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Book
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/11336/178011
Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records; Geological Society of America Annual Meeting; Estados Unidos; 2019; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/178011
identifier_str_mv Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records; Geological Society of America Annual Meeting; Estados Unidos; 2019; 1-1
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/10.1130/abs/2019AM-339170
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
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application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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