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dc.contributor.author
Fennell, Lucas Martín
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dc.contributor.author
Hren, Michael
dc.contributor.author
Brandon, Mark
dc.contributor.author
Colwyn, David
dc.contributor.author
Martos, Federico Exequiel
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dc.contributor.author
Lewis, Amelia
dc.contributor.author
Folguera Telichevsky, Andres
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dc.date.available
2022-04-08T12:35:42Z
dc.date.issued
2019
dc.identifier.citation
Eocene to modern topographic evolution of an Andean retroarc foreland basin (35°S) from stable isotope paleoaltimetry: implications for tectonic and geodynamic models; 8th International Symposium on Andean Geodynamics; Quito; Ecuador; 2019; 1
dc.identifier.uri
http://hdl.handle.net/11336/154725
dc.description.abstract
Andean basins contain a unique sedimentary record reflecting mountain building processes along thewestern margin of South America throughout its entire Meso-Cenozoic evolution (Horton, 2018). Inparticular, the retroarc foreland basins in west-central Argentina contain an archive of sedimentaccumulation rates, provenance, paleodrainage and deformation timings related to the growth of theSouthern Central Andes (27°-46°30?S; Ramos, 1999). However, this dataset has non-unique tectonicinterpretations, resulting in contrasting geodynamic scenarios. During the last decade, paleoaltimetrystudies using proxies to obtain the stable isotopic composition of paleoprecipitation have proved to be apowerful tool when assessing such contrasting scenarios, not only by reconstructing topography, butalso by adding a key element towards understanding changes in regional climate and biologicaldiversification (Mulch, 2016).The stable isotopic composition of precipitation reflects the degree of isotopic distillation during rainoutas an airmass moves across a landscape. Thus, materials that record this geochemical variable canprovide an indication of the present or past elevations along a moisture transport pathway. As volcanicashes are deposited on a landscape, they readily hydrate, providing a record of the isotopic compositionof ambient water over a timescale of 1-10 thousand years. Following hydration, water uptake ceasesand this initial signature is preserved, providing a long-term record of stable hydrogen isotopes (ID) ofpaleo-precipitation. Therefore, given that the activity of the Andean magmatic arc has resulted in anear-continuous production of felsic ashes for more than 65 million years, the stable isotope content ofhydrated volcanic glass from the Malargüe foreland basin (35°S) was extracted to analyze itstopographic evolution and compare it to the geological record.The ID of volcanic glasses preserved within strata of the Malargüe basin suggest high-standingtopography since at least 55 Ma, along with an increase in orographic fractionation during middleEocene to Oligocene times, followed by a decrease between the middle Miocene and the Pliocene.While the first event coincides with low accumulation rates during lacustrine and distal fluvial depositionin the basin, the second episode overlaps with high accumulation rates and proximal fluvial and alluvialsedimentation. These results support the hypothesis of a pre-Neogene orographic barrier and could bereflecting topographic changes associated with deep mantle processes that have been affecting theSouth American continent throughout most of the Cenozoic (Flament et al., 2015).Flament, N., Gurnis, M., Müller, R.D., Bower, D.J., and Husson, L., 2015. Influence of subduction history on South American topography. Earth andPlanetary Science Letters, 430, 9-18.Horton, B.K., 2018. Sedimentary record of Andean mountain building. Earth-Science Reviews, 178, 279-309.Mulch, A., 2016. Stable isotope paleoaltimetry and the evolution of landscapes and life. Earth and Planetary Science Letters, 433, 180-191.Ramos, V.A., 1999. Plate tectonic setting of the Andean Cordillera. Episodes, 22(3), 183-190.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
International Society for Animal Genetics
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Tectonics
dc.subject
Paleoaltimetry
dc.subject
Deuterium
dc.subject
Malargüe
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Eocene to modern topographic evolution of an Andean retroarc foreland basin (35°S) from stable isotope paleoaltimetry: implications for tectonic and geodynamic models
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2022-03-17T14:02:44Z
dc.journal.pagination
1
dc.journal.pais
Ecuador
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dc.journal.ciudad
Quito
dc.description.fil
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
dc.description.fil
Fil: Hren, Michael. University of Connecticut; Estados Unidos
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Fil: Brandon, Mark. University of Yale; Estados Unidos
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Fil: Colwyn, David. State University of Colorado at Boulder; Estados Unidos
dc.description.fil
Fil: Martos, Federico Exequiel. 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: Lewis, Amelia. Oberlin College; Estados Unidos
dc.description.fil
Fil: Folguera Telichevsky, Andres. 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
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.igepn.edu.ec/8isag-abstracts
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.igepn.edu.ec/8isag-abstracts/plenary-talks
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Autor
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Autor
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Autor
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dc.coverage
Internacional
dc.type.subtype
Simposio
dc.description.nombreEvento
8th International Symposium on Andean Geodynamics
dc.date.evento
2019-09-24
dc.description.ciudadEvento
Quito
dc.description.paisEvento
Ecuador
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dc.type.publicacion
Journal
dc.description.institucionOrganizadora
Escuela Politécnica Nacional
dc.description.institucionOrganizadora
Institut de Recherche pour le Développement
dc.source.revista
8th International Symposium on Andean Geodynamics
dc.date.eventoHasta
2019-09-26
dc.type
Simposio
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