Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)

Autores
Rosselot, Eduardo Agustín; Hurley, Maria; Solórzano, Andres; Sagripanti, Lucía; Fennell, Lucas Martín; Orts, Darío Leandro; Encinas, Alfonso; Folguera Telichevsky, Andres
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Cura Mallín Fm comprises Oligo-Miocene (24-12 Ma) volcanosedimentary rocks covering the axisof the Southern Central Andes of Argentina and Chile (36°-39°S). The tectonic mechanism fordeposition of this unit is still matter of debate. There are two contradictory proposals: while someauthors have proposed an extensional regime (Jordan et al. 2001; Burns et al. 2006) others suggested acompressional tectonic context (Cobbold et al. 2008).In this work we discuss the Cura Mallín Fm subsidence mechanisms, based on new field work, twoU-Pb dating of detrital and tuff zircons and a compilation of geochronological, structural, geochemical,thermochronological and subsidence data (33-44°S, 40-5 Ma).Cura Mallín rocks of 24-18 Ma are characterized by low La/Yb ratios (Kay et al. 2005; Profeta et al.2015) which are interpreted as indicative of a thin crust. These strata show wedge-like geometriesassociated with inverted normal faults in the vicinities of the Sierra Velluda volcano dated by Flynn et al.(2008) in 19.4 Ma. Growth strata associated with the back-limbs of the inverted anticlines were dated byFlynn et al. (2008) in 17-14 Ma.Compiled, isotopic data for arc-related volcanic rocks suggests crustal thickening coupled with rapidexhumation, evidenced by thermochronological data, at 20 Ma, which is consistent with the age ofsynorogenic strata in the foreland basins (Horton 2018). New U-Pb isotopic ages for a tuff andsandstone in growth strata of the Cura Mallín Fm at Cerro Piedra Parada and Cerro Rucañanco(Lonquimay area, Chile) have yielded 12.1 and 12.4 Ma respectively.According to our observations and previous data, while the basal section of the Cura Mallín Fm (24-18Ma) was deposited under extensional conditions, the uppermost half (17-12 Ma) was depositedsynchronously with the growth of the Andean range, as a series of hinterland basins associated without-of-sequence thrusting that reconfigured the entire western fold and thrust belt.
Fil: Rosselot, Eduardo Agustín. Universidad de Buenos Aires; Argentina
Fil: Hurley, Maria. Universidad de Buenos Aires; Argentina
Fil: Solórzano, Andres. Universidad de Concepción; Chile
Fil: Sagripanti, Lucía. 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: 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: Orts, Darío Leandro. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina
Fil: Encinas, Alfonso. Universidad de Concepción; Chile
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
8th International Symposium on Andean Geodynamics
Quito
Ecuador
Escuela Politécnica Nacional
Institut de Recherche pour le Développement
Materia
Tectonics
Geochronology
Contraction
Extension
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:11336/223110
Acceder
id CONICETDig_b184e2cf1dc78eb59727d802eada1622
oai_identifier_str oai:ri.conicet.gov.ar:11336/223110
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)Rosselot, Eduardo AgustínHurley, MariaSolórzano, AndresSagripanti, LucíaFennell, Lucas MartínOrts, Darío LeandroEncinas, AlfonsoFolguera Telichevsky, AndresTectonicsGeochronologyContractionExtensionhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Cura Mallín Fm comprises Oligo-Miocene (24-12 Ma) volcanosedimentary rocks covering the axisof the Southern Central Andes of Argentina and Chile (36°-39°S). The tectonic mechanism fordeposition of this unit is still matter of debate. There are two contradictory proposals: while someauthors have proposed an extensional regime (Jordan et al. 2001; Burns et al. 2006) others suggested acompressional tectonic context (Cobbold et al. 2008).In this work we discuss the Cura Mallín Fm subsidence mechanisms, based on new field work, twoU-Pb dating of detrital and tuff zircons and a compilation of geochronological, structural, geochemical,thermochronological and subsidence data (33-44°S, 40-5 Ma).Cura Mallín rocks of 24-18 Ma are characterized by low La/Yb ratios (Kay et al. 2005; Profeta et al.2015) which are interpreted as indicative of a thin crust. These strata show wedge-like geometriesassociated with inverted normal faults in the vicinities of the Sierra Velluda volcano dated by Flynn et al.(2008) in 19.4 Ma. Growth strata associated with the back-limbs of the inverted anticlines were dated byFlynn et al. (2008) in 17-14 Ma.Compiled, isotopic data for arc-related volcanic rocks suggests crustal thickening coupled with rapidexhumation, evidenced by thermochronological data, at 20 Ma, which is consistent with the age ofsynorogenic strata in the foreland basins (Horton 2018). New U-Pb isotopic ages for a tuff andsandstone in growth strata of the Cura Mallín Fm at Cerro Piedra Parada and Cerro Rucañanco(Lonquimay area, Chile) have yielded 12.1 and 12.4 Ma respectively.According to our observations and previous data, while the basal section of the Cura Mallín Fm (24-18Ma) was deposited under extensional conditions, the uppermost half (17-12 Ma) was depositedsynchronously with the growth of the Andean range, as a series of hinterland basins associated without-of-sequence thrusting that reconfigured the entire western fold and thrust belt.Fil: Rosselot, Eduardo Agustín. Universidad de Buenos Aires; ArgentinaFil: Hurley, Maria. Universidad de Buenos Aires; ArgentinaFil: Solórzano, Andres. Universidad de Concepción; ChileFil: Sagripanti, Lucía. 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: 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: Orts, Darío Leandro. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; ArgentinaFil: Encinas, Alfonso. Universidad de Concepción; ChileFil: 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"; Argentina8th International Symposium on Andean GeodynamicsQuitoEcuadorEscuela Politécnica NacionalInstitut de Recherche pour le DéveloppementInternational Society for Animal Genetics2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectSimposioBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/223110Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S); 8th International Symposium on Andean Geodynamics; Quito; Ecuador; 2019; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.igepn.edu.ec/8isag-abstractsinfo:eu-repo/semantics/altIdentifier/url/https://www.igepn.edu.ec/8isag-abstracts/tectonics-bassins?limit=20&limitstart=40Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:28:34Zoai:ri.conicet.gov.ar:11336/223110instacron: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:34982025-10-15 14:28:34.75CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
title Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
spellingShingle Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
Rosselot, Eduardo Agustín
Tectonics
Geochronology
Contraction
Extension
title_short Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
title_full Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
title_fullStr Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
title_full_unstemmed Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
title_sort Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S)
dc.creator.none.fl_str_mv Rosselot, Eduardo Agustín
Hurley, Maria
Solórzano, Andres
Sagripanti, Lucía
Fennell, Lucas Martín
Orts, Darío Leandro
Encinas, Alfonso
Folguera Telichevsky, Andres
author Rosselot, Eduardo Agustín
author_facet Rosselot, Eduardo Agustín
Hurley, Maria
Solórzano, Andres
Sagripanti, Lucía
Fennell, Lucas Martín
Orts, Darío Leandro
Encinas, Alfonso
Folguera Telichevsky, Andres
author_role author
author2 Hurley, Maria
Solórzano, Andres
Sagripanti, Lucía
Fennell, Lucas Martín
Orts, Darío Leandro
Encinas, Alfonso
Folguera Telichevsky, Andres
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Tectonics
Geochronology
Contraction
Extension
topic Tectonics
Geochronology
Contraction
Extension
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 Cura Mallín Fm comprises Oligo-Miocene (24-12 Ma) volcanosedimentary rocks covering the axisof the Southern Central Andes of Argentina and Chile (36°-39°S). The tectonic mechanism fordeposition of this unit is still matter of debate. There are two contradictory proposals: while someauthors have proposed an extensional regime (Jordan et al. 2001; Burns et al. 2006) others suggested acompressional tectonic context (Cobbold et al. 2008).In this work we discuss the Cura Mallín Fm subsidence mechanisms, based on new field work, twoU-Pb dating of detrital and tuff zircons and a compilation of geochronological, structural, geochemical,thermochronological and subsidence data (33-44°S, 40-5 Ma).Cura Mallín rocks of 24-18 Ma are characterized by low La/Yb ratios (Kay et al. 2005; Profeta et al.2015) which are interpreted as indicative of a thin crust. These strata show wedge-like geometriesassociated with inverted normal faults in the vicinities of the Sierra Velluda volcano dated by Flynn et al.(2008) in 19.4 Ma. Growth strata associated with the back-limbs of the inverted anticlines were dated byFlynn et al. (2008) in 17-14 Ma.Compiled, isotopic data for arc-related volcanic rocks suggests crustal thickening coupled with rapidexhumation, evidenced by thermochronological data, at 20 Ma, which is consistent with the age ofsynorogenic strata in the foreland basins (Horton 2018). New U-Pb isotopic ages for a tuff andsandstone in growth strata of the Cura Mallín Fm at Cerro Piedra Parada and Cerro Rucañanco(Lonquimay area, Chile) have yielded 12.1 and 12.4 Ma respectively.According to our observations and previous data, while the basal section of the Cura Mallín Fm (24-18Ma) was deposited under extensional conditions, the uppermost half (17-12 Ma) was depositedsynchronously with the growth of the Andean range, as a series of hinterland basins associated without-of-sequence thrusting that reconfigured the entire western fold and thrust belt.
Fil: Rosselot, Eduardo Agustín. Universidad de Buenos Aires; Argentina
Fil: Hurley, Maria. Universidad de Buenos Aires; Argentina
Fil: Solórzano, Andres. Universidad de Concepción; Chile
Fil: Sagripanti, Lucía. 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: 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: Orts, Darío Leandro. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina
Fil: Encinas, Alfonso. Universidad de Concepción; Chile
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
8th International Symposium on Andean Geodynamics
Quito
Ecuador
Escuela Politécnica Nacional
Institut de Recherche pour le Développement
description The Cura Mallín Fm comprises Oligo-Miocene (24-12 Ma) volcanosedimentary rocks covering the axisof the Southern Central Andes of Argentina and Chile (36°-39°S). The tectonic mechanism fordeposition of this unit is still matter of debate. There are two contradictory proposals: while someauthors have proposed an extensional regime (Jordan et al. 2001; Burns et al. 2006) others suggested acompressional tectonic context (Cobbold et al. 2008).In this work we discuss the Cura Mallín Fm subsidence mechanisms, based on new field work, twoU-Pb dating of detrital and tuff zircons and a compilation of geochronological, structural, geochemical,thermochronological and subsidence data (33-44°S, 40-5 Ma).Cura Mallín rocks of 24-18 Ma are characterized by low La/Yb ratios (Kay et al. 2005; Profeta et al.2015) which are interpreted as indicative of a thin crust. These strata show wedge-like geometriesassociated with inverted normal faults in the vicinities of the Sierra Velluda volcano dated by Flynn et al.(2008) in 19.4 Ma. Growth strata associated with the back-limbs of the inverted anticlines were dated byFlynn et al. (2008) in 17-14 Ma.Compiled, isotopic data for arc-related volcanic rocks suggests crustal thickening coupled with rapidexhumation, evidenced by thermochronological data, at 20 Ma, which is consistent with the age ofsynorogenic strata in the foreland basins (Horton 2018). New U-Pb isotopic ages for a tuff andsandstone in growth strata of the Cura Mallín Fm at Cerro Piedra Parada and Cerro Rucañanco(Lonquimay area, Chile) have yielded 12.1 and 12.4 Ma respectively.According to our observations and previous data, while the basal section of the Cura Mallín Fm (24-18Ma) was deposited under extensional conditions, the uppermost half (17-12 Ma) was depositedsynchronously with the growth of the Andean range, as a series of hinterland basins associated without-of-sequence thrusting that reconfigured the entire western fold and thrust belt.
publishDate 2019
dc.date.none.fl_str_mv 2019
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info:eu-repo/semantics/conferenceObject
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http://purl.org/coar/resource_type/c_5794
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status_str publishedVersion
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dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/223110
Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S); 8th International Symposium on Andean Geodynamics; Quito; Ecuador; 2019; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/223110
identifier_str_mv Preliminary results on the tectonic genesis of the Cura Mallín Formation in the Southern Central Andes (36° - 39°S); 8th International Symposium on Andean Geodynamics; Quito; Ecuador; 2019; 1-1
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv International Society for Animal Genetics
publisher.none.fl_str_mv International Society for Animal Genetics
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