Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio

Autores
Beilinson, Elisa; Gasparini, Germán Mariano; Tomassini, Rodrigo; Zárate, Marcelo Arístides; Deschamps, Cecilia Marcela; Rabassa, Jorge Oscar
Año de publicación
2017
Idioma
español castellano
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The geological history of the deposits exposed in the Quequén Salado River valley (QS), is reconstructed on the basis of stratigraphic, sedimentologic and paleomagnetic analyses, as well as the study of the fossil vertebrates. This is a crucial area for the understanding of the evolution of the Pampean Region during the late Miocene- early Pliocene interval, and to test the validity of the biochronologic and biostratigraphic schemes, especially the "Irenense". A geological model is proposed: a case of headward erosion that explains the spatial distribution of facies and fossils, being the youngest in the distal sector of de middle basin and the oldest in the lower basin. The sedimentary record represents the distal end of a distributary fluvial system draining from the Ventania ranges. The Paso del Indio Rico section is key to understand the stratigraphic meaning of the Miocene - Pliocene boundary (the Huayquerian and Montehermosan stages/ages). In this sense, two biozones stratigraphically overlapping were recognized: the Xenodontomys ellipticus Range Zone (late Miocene - early Pliocene; late Huayquerian), and the Eumysops laeviplicatus Range Zone (early Pliocene; Montehermosan). Geologic and paleontologic evidence reject the validity of the "lrenense" as a biostratigraphic unit because according to the proposed geologic model, it would be represented by the Xenodontomys ellipticus Range Zone in the lower basin of the QS and by elements of the Eumysops laeviplicatus Range Zone in the middle basin.
Facultad de Ciencias Naturales y Museo
Centro de Investigaciones Geológicas
Materia
Geología
Sedimentology
palaeoenvironments
Neogene
Quequén Salado river
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/190408
Acceder
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network_name_str SEDICI (UNLP)
spelling Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudioBeilinson, ElisaGasparini, Germán MarianoTomassini, RodrigoZárate, Marcelo ArístidesDeschamps, Cecilia MarcelaRabassa, Jorge OscarGeologíaSedimentologypalaeoenvironmentsNeogeneQuequén Salado riverThe geological history of the deposits exposed in the Quequén Salado River valley (QS), is reconstructed on the basis of stratigraphic, sedimentologic and paleomagnetic analyses, as well as the study of the fossil vertebrates. This is a crucial area for the understanding of the evolution of the Pampean Region during the late Miocene- early Pliocene interval, and to test the validity of the biochronologic and biostratigraphic schemes, especially the "Irenense". A geological model is proposed: a case of headward erosion that explains the spatial distribution of facies and fossils, being the youngest in the distal sector of de middle basin and the oldest in the lower basin. The sedimentary record represents the distal end of a distributary fluvial system draining from the Ventania ranges. The Paso del Indio Rico section is key to understand the stratigraphic meaning of the Miocene - Pliocene boundary (the Huayquerian and Montehermosan stages/ages). In this sense, two biozones stratigraphically overlapping were recognized: the Xenodontomys ellipticus Range Zone (late Miocene - early Pliocene; late Huayquerian), and the Eumysops laeviplicatus Range Zone (early Pliocene; Montehermosan). Geologic and paleontologic evidence reject the validity of the "lrenense" as a biostratigraphic unit because according to the proposed geologic model, it would be represented by the Xenodontomys ellipticus Range Zone in the lower basin of the QS and by elements of the Eumysops laeviplicatus Range Zone in the middle basin.Facultad de Ciencias Naturales y MuseoCentro de Investigaciones Geológicas2017-08info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionObjeto de conferenciahttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/190408spainfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2026-02-26T11:39:52Zoai:sedici.unlp.edu.ar:10915/190408Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292026-02-26 11:39:52.769SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
title Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
spellingShingle Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
Beilinson, Elisa
Geología
Sedimentology
palaeoenvironments
Neogene
Quequén Salado river
title_short Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
title_full Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
title_fullStr Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
title_full_unstemmed Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
title_sort Geología y biocronoestratigrafía del límite mio-plioceno en el sur de la región pampeana: la cuenca del Quequén Salado como caso de estudio
dc.creator.none.fl_str_mv Beilinson, Elisa
Gasparini, Germán Mariano
Tomassini, Rodrigo
Zárate, Marcelo Arístides
Deschamps, Cecilia Marcela
Rabassa, Jorge Oscar
author Beilinson, Elisa
author_facet Beilinson, Elisa
Gasparini, Germán Mariano
Tomassini, Rodrigo
Zárate, Marcelo Arístides
Deschamps, Cecilia Marcela
Rabassa, Jorge Oscar
author_role author
author2 Gasparini, Germán Mariano
Tomassini, Rodrigo
Zárate, Marcelo Arístides
Deschamps, Cecilia Marcela
Rabassa, Jorge Oscar
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Geología
Sedimentology
palaeoenvironments
Neogene
Quequén Salado river
topic Geología
Sedimentology
palaeoenvironments
Neogene
Quequén Salado river
dc.description.none.fl_txt_mv The geological history of the deposits exposed in the Quequén Salado River valley (QS), is reconstructed on the basis of stratigraphic, sedimentologic and paleomagnetic analyses, as well as the study of the fossil vertebrates. This is a crucial area for the understanding of the evolution of the Pampean Region during the late Miocene- early Pliocene interval, and to test the validity of the biochronologic and biostratigraphic schemes, especially the "Irenense". A geological model is proposed: a case of headward erosion that explains the spatial distribution of facies and fossils, being the youngest in the distal sector of de middle basin and the oldest in the lower basin. The sedimentary record represents the distal end of a distributary fluvial system draining from the Ventania ranges. The Paso del Indio Rico section is key to understand the stratigraphic meaning of the Miocene - Pliocene boundary (the Huayquerian and Montehermosan stages/ages). In this sense, two biozones stratigraphically overlapping were recognized: the Xenodontomys ellipticus Range Zone (late Miocene - early Pliocene; late Huayquerian), and the Eumysops laeviplicatus Range Zone (early Pliocene; Montehermosan). Geologic and paleontologic evidence reject the validity of the "lrenense" as a biostratigraphic unit because according to the proposed geologic model, it would be represented by the Xenodontomys ellipticus Range Zone in the lower basin of the QS and by elements of the Eumysops laeviplicatus Range Zone in the middle basin.
Facultad de Ciencias Naturales y Museo
Centro de Investigaciones Geológicas
description The geological history of the deposits exposed in the Quequén Salado River valley (QS), is reconstructed on the basis of stratigraphic, sedimentologic and paleomagnetic analyses, as well as the study of the fossil vertebrates. This is a crucial area for the understanding of the evolution of the Pampean Region during the late Miocene- early Pliocene interval, and to test the validity of the biochronologic and biostratigraphic schemes, especially the "Irenense". A geological model is proposed: a case of headward erosion that explains the spatial distribution of facies and fossils, being the youngest in the distal sector of de middle basin and the oldest in the lower basin. The sedimentary record represents the distal end of a distributary fluvial system draining from the Ventania ranges. The Paso del Indio Rico section is key to understand the stratigraphic meaning of the Miocene - Pliocene boundary (the Huayquerian and Montehermosan stages/ages). In this sense, two biozones stratigraphically overlapping were recognized: the Xenodontomys ellipticus Range Zone (late Miocene - early Pliocene; late Huayquerian), and the Eumysops laeviplicatus Range Zone (early Pliocene; Montehermosan). Geologic and paleontologic evidence reject the validity of the "lrenense" as a biostratigraphic unit because according to the proposed geologic model, it would be represented by the Xenodontomys ellipticus Range Zone in the lower basin of the QS and by elements of the Eumysops laeviplicatus Range Zone in the middle basin.
publishDate 2017
dc.date.none.fl_str_mv 2017-08
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
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language spa
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eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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