The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas

Autores
Casquet, César; Rapela, Carlos Washington; Baldo, Edgardo Gaspar Agustin; Pankhurst, Robert; Galindo, Carmen; Verdecchia, Sebastián Osvaldo; Murra, Juan Alberto Félix; Dahlquist, Juan Andrés
Año de publicación
2014
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Two series of pre-to syn-Pampean orogeny metasedimentary rocks can be distinguished in the Sierras Pampeanas on the basis of U-Pb SHRIMP detrital zircon ages. On one hand the Ancaján series consists of meta-siliciclastic rocks (metapsammites and metapelites) and marbles. These have a Grenville Zr age pattern (1.0–1.3Ga) with contributions from the trans-Laurentian granite province (~ 1.3–1.5 Ga) (Rapela et al., 2014; this symposium). They are stratigraphically associated with Ediacaran marbles (540–630 Ma) in both Western and the Eastern Sierras Pampeanas. New U-Pb SHRIMP detrital zircon age data further show that the Ancaján series has a previously unknown extension into the Sierras de Cordoba. The second series crops out only in the Eastern Sierras Pampeanas and corresponds to the well-known Puncoviscana Formation, a thick siliciclastic succession that was deposited before and during the Pampean orogeny (530–570 Ma): it contains major detrital zircon age peaks at 960–1100 Ma (Grenvillian) and 570–680 Ma, and lacks grains derived from the nearby Rio de la Plata craton (2.02–2.26 Ga). This formation crops out over a large area in northern Argentina (Cordillera Oriental and Sierras Subandinas). The sedimentary precursors of these two series were deposited on opposite margins of an open sea (the Puncoviscana–Saldania–Clymene ocean), which separated large continental masses – Laurentia-–MARA on the west and Kalahari+RPC on the east, which collided obliquely with each other during the Pampean–Saldanian orogeny between ~ 540 and 520 Ma (Casquet et al., 2012). No evidence of significant Pampean overprint is recognized in the Western Sierras Pampeanas, but the easternmost part of the Ancaján series (Sierras de Córdoba) was underwent syn-metamorphic folding and ductile shearing between 530 and 520 Ma. The marbles and meta-siliciclastic rocks of the Ancaján series were affected by major shear zones (e.g., Martino, 2003), suggesting that the latter constitute the boundary between the Ancaján series and the Puncoviscana Formation. A dismembered mafic–ultramafic igneous complex is also located within these shear zones (Bonalumi and Gigena, 1987); this has been interpreted as an ophiolitic complex embracing tracts with oceanic-ridge and probably back-arc chemistry that were tectonically emplaced into a suture (e.g., Ramos et al., 2000). The age of the complex remains poorly constrained. The evidence provided here that the Ancajan series is also present in the Sierras de Cordoba further strengthens the idea that the Pampean suture occurs there.
Fil: Casquet, César. Universidad Complutense de Madrid; España
Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Baldo, Edgardo Gaspar Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Pankhurst, Robert. British Antartic Survey; Reino Unido
Fil: Galindo, Carmen. Universidad Complutense de Madrid; España
Fil: Verdecchia, Sebastián Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Murra, Juan Alberto Félix. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Dahlquist, Juan Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Gondwana 15: North meets South
Madrid
España
Universidad Complutense de Madrid
Materia
ARGENTINA
SIERRAS PAMPEANAS
GONDWANA
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:11336/269888
Acceder
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network_name_str CONICET Digital (CONICET)
spelling The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras PampeanasCasquet, CésarRapela, Carlos WashingtonBaldo, Edgardo Gaspar AgustinPankhurst, RobertGalindo, CarmenVerdecchia, Sebastián OsvaldoMurra, Juan Alberto FélixDahlquist, Juan AndrésARGENTINASIERRAS PAMPEANASGONDWANAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Two series of pre-to syn-Pampean orogeny metasedimentary rocks can be distinguished in the Sierras Pampeanas on the basis of U-Pb SHRIMP detrital zircon ages. On one hand the Ancaján series consists of meta-siliciclastic rocks (metapsammites and metapelites) and marbles. These have a Grenville Zr age pattern (1.0–1.3Ga) with contributions from the trans-Laurentian granite province (~ 1.3–1.5 Ga) (Rapela et al., 2014; this symposium). They are stratigraphically associated with Ediacaran marbles (540–630 Ma) in both Western and the Eastern Sierras Pampeanas. New U-Pb SHRIMP detrital zircon age data further show that the Ancaján series has a previously unknown extension into the Sierras de Cordoba. The second series crops out only in the Eastern Sierras Pampeanas and corresponds to the well-known Puncoviscana Formation, a thick siliciclastic succession that was deposited before and during the Pampean orogeny (530–570 Ma): it contains major detrital zircon age peaks at 960–1100 Ma (Grenvillian) and 570–680 Ma, and lacks grains derived from the nearby Rio de la Plata craton (2.02–2.26 Ga). This formation crops out over a large area in northern Argentina (Cordillera Oriental and Sierras Subandinas). The sedimentary precursors of these two series were deposited on opposite margins of an open sea (the Puncoviscana–Saldania–Clymene ocean), which separated large continental masses – Laurentia-–MARA on the west and Kalahari+RPC on the east, which collided obliquely with each other during the Pampean–Saldanian orogeny between ~ 540 and 520 Ma (Casquet et al., 2012). No evidence of significant Pampean overprint is recognized in the Western Sierras Pampeanas, but the easternmost part of the Ancaján series (Sierras de Córdoba) was underwent syn-metamorphic folding and ductile shearing between 530 and 520 Ma. The marbles and meta-siliciclastic rocks of the Ancaján series were affected by major shear zones (e.g., Martino, 2003), suggesting that the latter constitute the boundary between the Ancaján series and the Puncoviscana Formation. A dismembered mafic–ultramafic igneous complex is also located within these shear zones (Bonalumi and Gigena, 1987); this has been interpreted as an ophiolitic complex embracing tracts with oceanic-ridge and probably back-arc chemistry that were tectonically emplaced into a suture (e.g., Ramos et al., 2000). The age of the complex remains poorly constrained. The evidence provided here that the Ancajan series is also present in the Sierras de Cordoba further strengthens the idea that the Pampean suture occurs there.Fil: Casquet, César. Universidad Complutense de Madrid; EspañaFil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Baldo, Edgardo Gaspar Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Pankhurst, Robert. British Antartic Survey; Reino UnidoFil: Galindo, Carmen. Universidad Complutense de Madrid; EspañaFil: Verdecchia, Sebastián Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Murra, Juan Alberto Félix. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Dahlquist, Juan Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaGondwana 15: North meets SouthMadridEspañaUniversidad Complutense de MadridUniversidad Complutense de Madrid2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/269888The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 29-29CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://docta.ucm.es/entities/publication/5f37c92c-15cd-4f60-8489-b733d815322fInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:48:01Zoai:ri.conicet.gov.ar:11336/269888instacron: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 09:48:01.304CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
title The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
spellingShingle The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
Casquet, César
ARGENTINA
SIERRAS PAMPEANAS
GONDWANA
title_short The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
title_full The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
title_fullStr The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
title_full_unstemmed The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
title_sort The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas
dc.creator.none.fl_str_mv Casquet, César
Rapela, Carlos Washington
Baldo, Edgardo Gaspar Agustin
Pankhurst, Robert
Galindo, Carmen
Verdecchia, Sebastián Osvaldo
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
author Casquet, César
author_facet Casquet, César
Rapela, Carlos Washington
Baldo, Edgardo Gaspar Agustin
Pankhurst, Robert
Galindo, Carmen
Verdecchia, Sebastián Osvaldo
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
author_role author
author2 Rapela, Carlos Washington
Baldo, Edgardo Gaspar Agustin
Pankhurst, Robert
Galindo, Carmen
Verdecchia, Sebastián Osvaldo
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv ARGENTINA
SIERRAS PAMPEANAS
GONDWANA
topic ARGENTINA
SIERRAS PAMPEANAS
GONDWANA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Two series of pre-to syn-Pampean orogeny metasedimentary rocks can be distinguished in the Sierras Pampeanas on the basis of U-Pb SHRIMP detrital zircon ages. On one hand the Ancaján series consists of meta-siliciclastic rocks (metapsammites and metapelites) and marbles. These have a Grenville Zr age pattern (1.0–1.3Ga) with contributions from the trans-Laurentian granite province (~ 1.3–1.5 Ga) (Rapela et al., 2014; this symposium). They are stratigraphically associated with Ediacaran marbles (540–630 Ma) in both Western and the Eastern Sierras Pampeanas. New U-Pb SHRIMP detrital zircon age data further show that the Ancaján series has a previously unknown extension into the Sierras de Cordoba. The second series crops out only in the Eastern Sierras Pampeanas and corresponds to the well-known Puncoviscana Formation, a thick siliciclastic succession that was deposited before and during the Pampean orogeny (530–570 Ma): it contains major detrital zircon age peaks at 960–1100 Ma (Grenvillian) and 570–680 Ma, and lacks grains derived from the nearby Rio de la Plata craton (2.02–2.26 Ga). This formation crops out over a large area in northern Argentina (Cordillera Oriental and Sierras Subandinas). The sedimentary precursors of these two series were deposited on opposite margins of an open sea (the Puncoviscana–Saldania–Clymene ocean), which separated large continental masses – Laurentia-–MARA on the west and Kalahari+RPC on the east, which collided obliquely with each other during the Pampean–Saldanian orogeny between ~ 540 and 520 Ma (Casquet et al., 2012). No evidence of significant Pampean overprint is recognized in the Western Sierras Pampeanas, but the easternmost part of the Ancaján series (Sierras de Córdoba) was underwent syn-metamorphic folding and ductile shearing between 530 and 520 Ma. The marbles and meta-siliciclastic rocks of the Ancaján series were affected by major shear zones (e.g., Martino, 2003), suggesting that the latter constitute the boundary between the Ancaján series and the Puncoviscana Formation. A dismembered mafic–ultramafic igneous complex is also located within these shear zones (Bonalumi and Gigena, 1987); this has been interpreted as an ophiolitic complex embracing tracts with oceanic-ridge and probably back-arc chemistry that were tectonically emplaced into a suture (e.g., Ramos et al., 2000). The age of the complex remains poorly constrained. The evidence provided here that the Ancajan series is also present in the Sierras de Cordoba further strengthens the idea that the Pampean suture occurs there.
Fil: Casquet, César. Universidad Complutense de Madrid; España
Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Baldo, Edgardo Gaspar Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Pankhurst, Robert. British Antartic Survey; Reino Unido
Fil: Galindo, Carmen. Universidad Complutense de Madrid; España
Fil: Verdecchia, Sebastián Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Murra, Juan Alberto Félix. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Dahlquist, Juan Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Gondwana 15: North meets South
Madrid
España
Universidad Complutense de Madrid
description Two series of pre-to syn-Pampean orogeny metasedimentary rocks can be distinguished in the Sierras Pampeanas on the basis of U-Pb SHRIMP detrital zircon ages. On one hand the Ancaján series consists of meta-siliciclastic rocks (metapsammites and metapelites) and marbles. These have a Grenville Zr age pattern (1.0–1.3Ga) with contributions from the trans-Laurentian granite province (~ 1.3–1.5 Ga) (Rapela et al., 2014; this symposium). They are stratigraphically associated with Ediacaran marbles (540–630 Ma) in both Western and the Eastern Sierras Pampeanas. New U-Pb SHRIMP detrital zircon age data further show that the Ancaján series has a previously unknown extension into the Sierras de Cordoba. The second series crops out only in the Eastern Sierras Pampeanas and corresponds to the well-known Puncoviscana Formation, a thick siliciclastic succession that was deposited before and during the Pampean orogeny (530–570 Ma): it contains major detrital zircon age peaks at 960–1100 Ma (Grenvillian) and 570–680 Ma, and lacks grains derived from the nearby Rio de la Plata craton (2.02–2.26 Ga). This formation crops out over a large area in northern Argentina (Cordillera Oriental and Sierras Subandinas). The sedimentary precursors of these two series were deposited on opposite margins of an open sea (the Puncoviscana–Saldania–Clymene ocean), which separated large continental masses – Laurentia-–MARA on the west and Kalahari+RPC on the east, which collided obliquely with each other during the Pampean–Saldanian orogeny between ~ 540 and 520 Ma (Casquet et al., 2012). No evidence of significant Pampean overprint is recognized in the Western Sierras Pampeanas, but the easternmost part of the Ancaján series (Sierras de Córdoba) was underwent syn-metamorphic folding and ductile shearing between 530 and 520 Ma. The marbles and meta-siliciclastic rocks of the Ancaján series were affected by major shear zones (e.g., Martino, 2003), suggesting that the latter constitute the boundary between the Ancaján series and the Puncoviscana Formation. A dismembered mafic–ultramafic igneous complex is also located within these shear zones (Bonalumi and Gigena, 1987); this has been interpreted as an ophiolitic complex embracing tracts with oceanic-ridge and probably back-arc chemistry that were tectonically emplaced into a suture (e.g., Ramos et al., 2000). The age of the complex remains poorly constrained. The evidence provided here that the Ancajan series is also present in the Sierras de Cordoba further strengthens the idea that the Pampean suture occurs there.
publishDate 2014
dc.date.none.fl_str_mv 2014
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dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/269888
The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 29-29
CONICET Digital
CONICET
url http://hdl.handle.net/11336/269888
identifier_str_mv The relationship between pre- and syn-Pampean orogeny metasedimentary rocks in the Eastern Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 29-29
CONICET Digital
CONICET
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dc.publisher.none.fl_str_mv Universidad Complutense de Madrid
publisher.none.fl_str_mv Universidad Complutense de Madrid
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