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dc.contributor.author
Hren, Michael
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Fennell, Lucas Martín
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Brandon, Mark Thomas
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Super, James
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Colwyn, David
dc.date.available
2022-11-16T15:59:02Z
dc.date.issued
2019
dc.identifier.citation
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
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http://hdl.handle.net/11336/178011
dc.description.abstract
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.
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application/pdf
dc.language.iso
eng
dc.publisher
Geological Society of America
dc.rights
info:eu-repo/semantics/openAccess
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Tectonics
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Climate
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Isotopes
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Organics
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Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Cenozoic climate and topographic change in the Southern Andes (35°-47°s): a comparison of organic molecular and inorganic isotopic records
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info:eu-repo/semantics/publishedVersion
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info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2022-11-09T18:45:20Z
dc.journal.pagination
1-1
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Phoenix
dc.description.fil
Fil: Hren, Michael. University of Connecticut; Estados Unidos
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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
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Fil: Brandon, Mark Thomas. University of Yale; Estados Unidos
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Fil: Super, James. University of Yale; Estados Unidos
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Fil: Colwyn, David. State University of Colorado at Boulder; Estados Unidos
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://gsa.confex.com/gsa/2019AM/webprogram/Paper339170.html
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1130/abs/2019AM-339170
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Autor
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Autor
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Autor
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Autor
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Autor
dc.coverage
Internacional
dc.type.subtype
Reunión
dc.description.nombreEvento
Geological Society of America Annual Meeting
dc.date.evento
2019-09-22
dc.description.paisEvento
Estados Unidos
dc.type.publicacion
Book
dc.description.institucionOrganizadora
Geological Society of America
dc.source.libro
Abstracts of the Geological Society of America Annual Meeting
dc.date.eventoHasta
2019-09-25
dc.type
Reunión
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