Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas

Autores
Rapela, Carlos Washington; Verdecchia, Sebastián Osvaldo; Casquet, César; Pankhurst, Robert; Baldo, Edgardo Gaspar Agustin; Galindo, Carmen; Murra, Juan Alberto Félix; Dahlquist, Juan Andrés; Fanning, Christopher Mark
Año de publicación
2014
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Basement exposures in the Sierras Pampeanas at 26º–33ºS give a unique opportunity to compare paleo-sediment sources along a significant stretch of the Andean foreland. To this end we have studied a large number of widespread samples using U-Pb SHRIMP age determination of detrital zircons, coupled with identically-located Hf and O determinations. The study includes comparison with neighbouring sectors in NW Argentina and Patagonia, and inferred sources in Eastern Laurentia, Southern Africa and East Antarctica. The detrital zircon age patterns of metasedimentary rocks from the Western Sierras Pampeanas (WSP) indicate predominant derivation from the adjacent 1330–1030 Ma Mesoproterozoic complexes, with the same lithologies and time span as the Grenville province in Eastern Laurentia. More specifically, an important secondary detrital peak at ~ 1.4 Ga shows the same juvenile Hf isotope signature (eHft from +11.2 to +5.3) as the Southern Rhyolite Province of the southeast USA, which lies along the western margin of the Grenville province. Terranes with Laurentian affinities are also found in the Puna and Arequipa to the north, and probably to the south in the North Patagonian Massif. Thus a large, ribbon-like collage of drifted Laurentiaderived terranes (MARA) is inferred to have been welded to SW Gondwana during the Early Cambrian Pampean orogeny. The MARA terrane collage collided obliquely with the Eastern Sierras Pampeanas (ESP), the latter consisting of a 540–530 Ma continental volcanic arc and its Neoproterozoic to Early Cambrian metasedimentary envelope. The detrital zircon patterns of ESP high-grade metasedimentary rocks deposited before the Pampean orogeny are identical to those of the low-grade tract of the Puncoviscana Formation of NW Argentina. The main pattern of the “Puncoviscan series” is strongly bimodal, with peaks at ~ 570–670 and ~ 1000 Ma and a minor Late Paleoproterozoic peak (1860–1900 Ma). There are no obvious nearby sources for the main peaks, which are probably derived from SW Gondwana sources such as the East Africa–Antarctic orogen and/or the Dom Feliciano belt. Although volumetrically very scarce compared with the “Puncoviscan series”, distinct detrital zircon age patterns have been reported from both the ESP and NW Argentina. For example, our sample from the Ancaján series, which is tectonically interleaved with the “Puncoviscan series” near the eastern slope of Sierra de Ancasti, has several characteristics in common with the metasedimentary rocks and Neoproterozoic cover of the WSP. This includes important Early Mesoproterozoic components (1200–1500 Ma), significant Late Paleoproterozoic peaks (~ 1800–1900 Ma), and the absence or very minor presence of Late Neoproterozoic peaks. This important observation strongly suggests that the Laurentian platform sediments of MARA were tectonically involved with SW Gondwana sediments during the Early Cambrian Pampean collision. The accretion of MARA shaped the outer edge of SW Gondwana, becoming the basement for future Andean episodes.
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: 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: Casquet, César. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; España
Fil: Pankhurst, Robert. British Antartic Survey; Reino Unido
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: Galindo, Carmen. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; España
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
Fil: Fanning, Christopher Mark. The Australian National University; Australia
Gondwana 15: North meets South
Madrid
España
Universidad Complutense de Madrid
Materia
GONDWANA
SHRIMP
SIERRAS PAMPEANAS
PAMPEAN OROGENY
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:11336/271630

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spelling Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras PampeanasRapela, Carlos WashingtonVerdecchia, Sebastián OsvaldoCasquet, CésarPankhurst, RobertBaldo, Edgardo Gaspar AgustinGalindo, CarmenMurra, Juan Alberto FélixDahlquist, Juan AndrésFanning, Christopher MarkGONDWANASHRIMPSIERRAS PAMPEANASPAMPEAN OROGENYhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Basement exposures in the Sierras Pampeanas at 26º–33ºS give a unique opportunity to compare paleo-sediment sources along a significant stretch of the Andean foreland. To this end we have studied a large number of widespread samples using U-Pb SHRIMP age determination of detrital zircons, coupled with identically-located Hf and O determinations. The study includes comparison with neighbouring sectors in NW Argentina and Patagonia, and inferred sources in Eastern Laurentia, Southern Africa and East Antarctica. The detrital zircon age patterns of metasedimentary rocks from the Western Sierras Pampeanas (WSP) indicate predominant derivation from the adjacent 1330–1030 Ma Mesoproterozoic complexes, with the same lithologies and time span as the Grenville province in Eastern Laurentia. More specifically, an important secondary detrital peak at ~ 1.4 Ga shows the same juvenile Hf isotope signature (eHft from +11.2 to +5.3) as the Southern Rhyolite Province of the southeast USA, which lies along the western margin of the Grenville province. Terranes with Laurentian affinities are also found in the Puna and Arequipa to the north, and probably to the south in the North Patagonian Massif. Thus a large, ribbon-like collage of drifted Laurentiaderived terranes (MARA) is inferred to have been welded to SW Gondwana during the Early Cambrian Pampean orogeny. The MARA terrane collage collided obliquely with the Eastern Sierras Pampeanas (ESP), the latter consisting of a 540–530 Ma continental volcanic arc and its Neoproterozoic to Early Cambrian metasedimentary envelope. The detrital zircon patterns of ESP high-grade metasedimentary rocks deposited before the Pampean orogeny are identical to those of the low-grade tract of the Puncoviscana Formation of NW Argentina. The main pattern of the “Puncoviscan series” is strongly bimodal, with peaks at ~ 570–670 and ~ 1000 Ma and a minor Late Paleoproterozoic peak (1860–1900 Ma). There are no obvious nearby sources for the main peaks, which are probably derived from SW Gondwana sources such as the East Africa–Antarctic orogen and/or the Dom Feliciano belt. Although volumetrically very scarce compared with the “Puncoviscan series”, distinct detrital zircon age patterns have been reported from both the ESP and NW Argentina. For example, our sample from the Ancaján series, which is tectonically interleaved with the “Puncoviscan series” near the eastern slope of Sierra de Ancasti, has several characteristics in common with the metasedimentary rocks and Neoproterozoic cover of the WSP. This includes important Early Mesoproterozoic components (1200–1500 Ma), significant Late Paleoproterozoic peaks (~ 1800–1900 Ma), and the absence or very minor presence of Late Neoproterozoic peaks. This important observation strongly suggests that the Laurentian platform sediments of MARA were tectonically involved with SW Gondwana sediments during the Early Cambrian Pampean collision. The accretion of MARA shaped the outer edge of SW Gondwana, becoming the basement for future Andean episodes.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; ArgentinaFil: 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: Casquet, César. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; EspañaFil: Pankhurst, Robert. British Antartic Survey; Reino UnidoFil: 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: Galindo, Carmen. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; EspañaFil: 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; ArgentinaFil: Fanning, Christopher Mark. The Australian National University; AustraliaGondwana 15: North meets SouthMadridEspañaUniversidad Complutense de MadridUniversidad Complutense de Madrid2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectConferenciaBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/271630Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 143-143CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://hdl.handle.net/20.500.14352/36082Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:35:10Zoai:ri.conicet.gov.ar:11336/271630instacron: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 10:35:10.519CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
title Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
spellingShingle Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
Rapela, Carlos Washington
GONDWANA
SHRIMP
SIERRAS PAMPEANAS
PAMPEAN OROGENY
title_short Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
title_full Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
title_fullStr Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
title_full_unstemmed Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
title_sort Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas
dc.creator.none.fl_str_mv Rapela, Carlos Washington
Verdecchia, Sebastián Osvaldo
Casquet, César
Pankhurst, Robert
Baldo, Edgardo Gaspar Agustin
Galindo, Carmen
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
Fanning, Christopher Mark
author Rapela, Carlos Washington
author_facet Rapela, Carlos Washington
Verdecchia, Sebastián Osvaldo
Casquet, César
Pankhurst, Robert
Baldo, Edgardo Gaspar Agustin
Galindo, Carmen
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
Fanning, Christopher Mark
author_role author
author2 Verdecchia, Sebastián Osvaldo
Casquet, César
Pankhurst, Robert
Baldo, Edgardo Gaspar Agustin
Galindo, Carmen
Murra, Juan Alberto Félix
Dahlquist, Juan Andrés
Fanning, Christopher Mark
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv GONDWANA
SHRIMP
SIERRAS PAMPEANAS
PAMPEAN OROGENY
topic GONDWANA
SHRIMP
SIERRAS PAMPEANAS
PAMPEAN OROGENY
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Basement exposures in the Sierras Pampeanas at 26º–33ºS give a unique opportunity to compare paleo-sediment sources along a significant stretch of the Andean foreland. To this end we have studied a large number of widespread samples using U-Pb SHRIMP age determination of detrital zircons, coupled with identically-located Hf and O determinations. The study includes comparison with neighbouring sectors in NW Argentina and Patagonia, and inferred sources in Eastern Laurentia, Southern Africa and East Antarctica. The detrital zircon age patterns of metasedimentary rocks from the Western Sierras Pampeanas (WSP) indicate predominant derivation from the adjacent 1330–1030 Ma Mesoproterozoic complexes, with the same lithologies and time span as the Grenville province in Eastern Laurentia. More specifically, an important secondary detrital peak at ~ 1.4 Ga shows the same juvenile Hf isotope signature (eHft from +11.2 to +5.3) as the Southern Rhyolite Province of the southeast USA, which lies along the western margin of the Grenville province. Terranes with Laurentian affinities are also found in the Puna and Arequipa to the north, and probably to the south in the North Patagonian Massif. Thus a large, ribbon-like collage of drifted Laurentiaderived terranes (MARA) is inferred to have been welded to SW Gondwana during the Early Cambrian Pampean orogeny. The MARA terrane collage collided obliquely with the Eastern Sierras Pampeanas (ESP), the latter consisting of a 540–530 Ma continental volcanic arc and its Neoproterozoic to Early Cambrian metasedimentary envelope. The detrital zircon patterns of ESP high-grade metasedimentary rocks deposited before the Pampean orogeny are identical to those of the low-grade tract of the Puncoviscana Formation of NW Argentina. The main pattern of the “Puncoviscan series” is strongly bimodal, with peaks at ~ 570–670 and ~ 1000 Ma and a minor Late Paleoproterozoic peak (1860–1900 Ma). There are no obvious nearby sources for the main peaks, which are probably derived from SW Gondwana sources such as the East Africa–Antarctic orogen and/or the Dom Feliciano belt. Although volumetrically very scarce compared with the “Puncoviscan series”, distinct detrital zircon age patterns have been reported from both the ESP and NW Argentina. For example, our sample from the Ancaján series, which is tectonically interleaved with the “Puncoviscan series” near the eastern slope of Sierra de Ancasti, has several characteristics in common with the metasedimentary rocks and Neoproterozoic cover of the WSP. This includes important Early Mesoproterozoic components (1200–1500 Ma), significant Late Paleoproterozoic peaks (~ 1800–1900 Ma), and the absence or very minor presence of Late Neoproterozoic peaks. This important observation strongly suggests that the Laurentian platform sediments of MARA were tectonically involved with SW Gondwana sediments during the Early Cambrian Pampean collision. The accretion of MARA shaped the outer edge of SW Gondwana, becoming the basement for future Andean episodes.
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: 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: Casquet, César. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; España
Fil: Pankhurst, Robert. British Antartic Survey; Reino Unido
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: Galindo, Carmen. Universidad Complutense de Madrid; España. Consejo Superior de Investigaciones Científicas; España
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
Fil: Fanning, Christopher Mark. The Australian National University; Australia
Gondwana 15: North meets South
Madrid
España
Universidad Complutense de Madrid
description Basement exposures in the Sierras Pampeanas at 26º–33ºS give a unique opportunity to compare paleo-sediment sources along a significant stretch of the Andean foreland. To this end we have studied a large number of widespread samples using U-Pb SHRIMP age determination of detrital zircons, coupled with identically-located Hf and O determinations. The study includes comparison with neighbouring sectors in NW Argentina and Patagonia, and inferred sources in Eastern Laurentia, Southern Africa and East Antarctica. The detrital zircon age patterns of metasedimentary rocks from the Western Sierras Pampeanas (WSP) indicate predominant derivation from the adjacent 1330–1030 Ma Mesoproterozoic complexes, with the same lithologies and time span as the Grenville province in Eastern Laurentia. More specifically, an important secondary detrital peak at ~ 1.4 Ga shows the same juvenile Hf isotope signature (eHft from +11.2 to +5.3) as the Southern Rhyolite Province of the southeast USA, which lies along the western margin of the Grenville province. Terranes with Laurentian affinities are also found in the Puna and Arequipa to the north, and probably to the south in the North Patagonian Massif. Thus a large, ribbon-like collage of drifted Laurentiaderived terranes (MARA) is inferred to have been welded to SW Gondwana during the Early Cambrian Pampean orogeny. The MARA terrane collage collided obliquely with the Eastern Sierras Pampeanas (ESP), the latter consisting of a 540–530 Ma continental volcanic arc and its Neoproterozoic to Early Cambrian metasedimentary envelope. The detrital zircon patterns of ESP high-grade metasedimentary rocks deposited before the Pampean orogeny are identical to those of the low-grade tract of the Puncoviscana Formation of NW Argentina. The main pattern of the “Puncoviscan series” is strongly bimodal, with peaks at ~ 570–670 and ~ 1000 Ma and a minor Late Paleoproterozoic peak (1860–1900 Ma). There are no obvious nearby sources for the main peaks, which are probably derived from SW Gondwana sources such as the East Africa–Antarctic orogen and/or the Dom Feliciano belt. Although volumetrically very scarce compared with the “Puncoviscan series”, distinct detrital zircon age patterns have been reported from both the ESP and NW Argentina. For example, our sample from the Ancaján series, which is tectonically interleaved with the “Puncoviscan series” near the eastern slope of Sierra de Ancasti, has several characteristics in common with the metasedimentary rocks and Neoproterozoic cover of the WSP. This includes important Early Mesoproterozoic components (1200–1500 Ma), significant Late Paleoproterozoic peaks (~ 1800–1900 Ma), and the absence or very minor presence of Late Neoproterozoic peaks. This important observation strongly suggests that the Laurentian platform sediments of MARA were tectonically involved with SW Gondwana sediments during the Early Cambrian Pampean collision. The accretion of MARA shaped the outer edge of SW Gondwana, becoming the basement for future Andean episodes.
publishDate 2014
dc.date.none.fl_str_mv 2014
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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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dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/271630
Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 143-143
CONICET Digital
CONICET
url http://hdl.handle.net/11336/271630
identifier_str_mv Early Paleozoic construction of southwest Gondwana: Evidence from detrital zircons in the Sierras Pampeanas; Gondwana 15: North meets South; Madrid; España; 2014; 143-143
CONICET Digital
CONICET
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