Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insigh...

Autores
Dyhr, Charlotte T.; Holm, Paul M.; Llambias, Eduardo Jorge
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
New 40Ar/39Ar analyses constrain the formation of the volcanic succession of Sierra de Palaoco in the presentback-arc of the Andean Southern Volcanic Zone (SVZ), near 36°S, to the Late Miocene and assigns them to theHuincán II Formation. The composition of major and trace elements, Sr, Nd and Pb isotopes of the Palaoco andnearby Río Grande rocks require a strong arc-like component in the mantle that is absent or weak in bothEarly Miocene (Fortunoso Group) and Pleistocene alkaline lavas (Llancanelo Group) erupted in the same area.Weevaluate the relative roles of varyingmantle source compositions and crustal contamination in the generationof geochemically very different lavas from the Palaoco, Fortunoso and Río Grande volcanic fields, north of thePayún Matrú Volcano. The source for the Early Miocene Fortunoso(I) basalts was a OIB-type mantle devoid ofsubduction zone input. This type of OIB-like volcanic activity terminated due to a change from an extensionalto a compressional tectonic regime. Towards the end of the Miocene renewed alkaline volcanism at Fortunoso(II) display a transition to arc-type incompatible element enrichment. Shortly after the calc-alkaline Palaoco volcanismstarted with a very strong geochemical arc-signature including Ba/La ≈ 60 and La/Nb = 2?3. After aquiesence of 1 Ma the major part of the voluminous Late Palaoco basalts were erupted around 7.5 Ma over afew hundred ka. These are less enriched in Ba and Sr and have compositions like many Holocene rocks of theSouthern Volcanic Zone. Isotopically the Fortunoso I and Palaoco rocks are distinct. Regional volcanism of theCharilehue, Huincán I and II mostly has a moderate arc-type enrichment indicating incipient arc developments.However, Palaoco and La Brea at (c. 35°S) showfull geochemical arc-signature, andwe infer that a frontal arcwasestablished. The subsequent development in the Palaoco-Río Grande area encompasses renewed late Pliocenecalc-alkaline low volume volcanic eruptions (Río Grande group) succeeded in the Late Pleistocene by alkalineOIB-type eruptions (Llancanelo group). In the light of the course of volcanism to the east, in the Nevado area,where late Miocene?Pliocene calc-alkaline volcanism was followed by Late Pliocene?Pleistocene alkaline volcanism.We propose a scenario where the Nazca plate developed an eastwards widening flat slab from which theeast dipping slab before the Late Pliocene translated from Palaoco to Nevado and subsequently retreated passingRío Grande in the Late Pliocene. Alkaline back-arc volcanism was active east of the arc-volcanism and expandedwestwards during the Late Pliocene and Pleistocene.
Fil: Dyhr, Charlotte T.. Universidad de Copenhagen; Dinamarca
Fil: Holm, Paul M.. Universidad de Copenhagen; Dinamarca
Fil: Llambias, Eduardo Jorge. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Back-Arc Volcanism
Geochemistry
Radiogenic Isotopes
Payenia
40ar/39ar Dating
Flat Slab
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:11336/23943

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network_name_str CONICET Digital (CONICET)
spelling Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elementsDyhr, Charlotte T.Holm, Paul M.Llambias, Eduardo JorgeBack-Arc VolcanismGeochemistryRadiogenic IsotopesPayenia40ar/39ar DatingFlat Slabhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1New 40Ar/39Ar analyses constrain the formation of the volcanic succession of Sierra de Palaoco in the presentback-arc of the Andean Southern Volcanic Zone (SVZ), near 36°S, to the Late Miocene and assigns them to theHuincán II Formation. The composition of major and trace elements, Sr, Nd and Pb isotopes of the Palaoco andnearby Río Grande rocks require a strong arc-like component in the mantle that is absent or weak in bothEarly Miocene (Fortunoso Group) and Pleistocene alkaline lavas (Llancanelo Group) erupted in the same area.Weevaluate the relative roles of varyingmantle source compositions and crustal contamination in the generationof geochemically very different lavas from the Palaoco, Fortunoso and Río Grande volcanic fields, north of thePayún Matrú Volcano. The source for the Early Miocene Fortunoso(I) basalts was a OIB-type mantle devoid ofsubduction zone input. This type of OIB-like volcanic activity terminated due to a change from an extensionalto a compressional tectonic regime. Towards the end of the Miocene renewed alkaline volcanism at Fortunoso(II) display a transition to arc-type incompatible element enrichment. Shortly after the calc-alkaline Palaoco volcanismstarted with a very strong geochemical arc-signature including Ba/La ≈ 60 and La/Nb = 2?3. After aquiesence of 1 Ma the major part of the voluminous Late Palaoco basalts were erupted around 7.5 Ma over afew hundred ka. These are less enriched in Ba and Sr and have compositions like many Holocene rocks of theSouthern Volcanic Zone. Isotopically the Fortunoso I and Palaoco rocks are distinct. Regional volcanism of theCharilehue, Huincán I and II mostly has a moderate arc-type enrichment indicating incipient arc developments.However, Palaoco and La Brea at (c. 35°S) showfull geochemical arc-signature, andwe infer that a frontal arcwasestablished. The subsequent development in the Palaoco-Río Grande area encompasses renewed late Pliocenecalc-alkaline low volume volcanic eruptions (Río Grande group) succeeded in the Late Pleistocene by alkalineOIB-type eruptions (Llancanelo group). In the light of the course of volcanism to the east, in the Nevado area,where late Miocene?Pliocene calc-alkaline volcanism was followed by Late Pliocene?Pleistocene alkaline volcanism.We propose a scenario where the Nazca plate developed an eastwards widening flat slab from which theeast dipping slab before the Late Pliocene translated from Palaoco to Nevado and subsequently retreated passingRío Grande in the Late Pliocene. Alkaline back-arc volcanism was active east of the arc-volcanism and expandedwestwards during the Late Pliocene and Pleistocene.Fil: Dyhr, Charlotte T.. Universidad de Copenhagen; DinamarcaFil: Holm, Paul M.. Universidad de Copenhagen; DinamarcaFil: Llambias, Eduardo Jorge. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaElsevier Science2013-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/23943Dyhr, Charlotte T.; Holm, Paul M.; Llambias, Eduardo Jorge; Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements; Elsevier Science; Journal of Volcanology and Geothermal Research; 266; 1-10-2013; 50-680377-0273CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0377027313002394info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2013.08.005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:00:16Zoai:ri.conicet.gov.ar:11336/23943instacron: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:34982025-09-03 10:00:17.047CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
title Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
spellingShingle Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
Dyhr, Charlotte T.
Back-Arc Volcanism
Geochemistry
Radiogenic Isotopes
Payenia
40ar/39ar Dating
Flat Slab
title_short Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
title_full Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
title_fullStr Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
title_full_unstemmed Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
title_sort Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements
dc.creator.none.fl_str_mv Dyhr, Charlotte T.
Holm, Paul M.
Llambias, Eduardo Jorge
author Dyhr, Charlotte T.
author_facet Dyhr, Charlotte T.
Holm, Paul M.
Llambias, Eduardo Jorge
author_role author
author2 Holm, Paul M.
Llambias, Eduardo Jorge
author2_role author
author
dc.subject.none.fl_str_mv Back-Arc Volcanism
Geochemistry
Radiogenic Isotopes
Payenia
40ar/39ar Dating
Flat Slab
topic Back-Arc Volcanism
Geochemistry
Radiogenic Isotopes
Payenia
40ar/39ar Dating
Flat Slab
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv New 40Ar/39Ar analyses constrain the formation of the volcanic succession of Sierra de Palaoco in the presentback-arc of the Andean Southern Volcanic Zone (SVZ), near 36°S, to the Late Miocene and assigns them to theHuincán II Formation. The composition of major and trace elements, Sr, Nd and Pb isotopes of the Palaoco andnearby Río Grande rocks require a strong arc-like component in the mantle that is absent or weak in bothEarly Miocene (Fortunoso Group) and Pleistocene alkaline lavas (Llancanelo Group) erupted in the same area.Weevaluate the relative roles of varyingmantle source compositions and crustal contamination in the generationof geochemically very different lavas from the Palaoco, Fortunoso and Río Grande volcanic fields, north of thePayún Matrú Volcano. The source for the Early Miocene Fortunoso(I) basalts was a OIB-type mantle devoid ofsubduction zone input. This type of OIB-like volcanic activity terminated due to a change from an extensionalto a compressional tectonic regime. Towards the end of the Miocene renewed alkaline volcanism at Fortunoso(II) display a transition to arc-type incompatible element enrichment. Shortly after the calc-alkaline Palaoco volcanismstarted with a very strong geochemical arc-signature including Ba/La ≈ 60 and La/Nb = 2?3. After aquiesence of 1 Ma the major part of the voluminous Late Palaoco basalts were erupted around 7.5 Ma over afew hundred ka. These are less enriched in Ba and Sr and have compositions like many Holocene rocks of theSouthern Volcanic Zone. Isotopically the Fortunoso I and Palaoco rocks are distinct. Regional volcanism of theCharilehue, Huincán I and II mostly has a moderate arc-type enrichment indicating incipient arc developments.However, Palaoco and La Brea at (c. 35°S) showfull geochemical arc-signature, andwe infer that a frontal arcwasestablished. The subsequent development in the Palaoco-Río Grande area encompasses renewed late Pliocenecalc-alkaline low volume volcanic eruptions (Río Grande group) succeeded in the Late Pleistocene by alkalineOIB-type eruptions (Llancanelo group). In the light of the course of volcanism to the east, in the Nevado area,where late Miocene?Pliocene calc-alkaline volcanism was followed by Late Pliocene?Pleistocene alkaline volcanism.We propose a scenario where the Nazca plate developed an eastwards widening flat slab from which theeast dipping slab before the Late Pliocene translated from Palaoco to Nevado and subsequently retreated passingRío Grande in the Late Pliocene. Alkaline back-arc volcanism was active east of the arc-volcanism and expandedwestwards during the Late Pliocene and Pleistocene.
Fil: Dyhr, Charlotte T.. Universidad de Copenhagen; Dinamarca
Fil: Holm, Paul M.. Universidad de Copenhagen; Dinamarca
Fil: Llambias, Eduardo Jorge. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description New 40Ar/39Ar analyses constrain the formation of the volcanic succession of Sierra de Palaoco in the presentback-arc of the Andean Southern Volcanic Zone (SVZ), near 36°S, to the Late Miocene and assigns them to theHuincán II Formation. The composition of major and trace elements, Sr, Nd and Pb isotopes of the Palaoco andnearby Río Grande rocks require a strong arc-like component in the mantle that is absent or weak in bothEarly Miocene (Fortunoso Group) and Pleistocene alkaline lavas (Llancanelo Group) erupted in the same area.Weevaluate the relative roles of varyingmantle source compositions and crustal contamination in the generationof geochemically very different lavas from the Palaoco, Fortunoso and Río Grande volcanic fields, north of thePayún Matrú Volcano. The source for the Early Miocene Fortunoso(I) basalts was a OIB-type mantle devoid ofsubduction zone input. This type of OIB-like volcanic activity terminated due to a change from an extensionalto a compressional tectonic regime. Towards the end of the Miocene renewed alkaline volcanism at Fortunoso(II) display a transition to arc-type incompatible element enrichment. Shortly after the calc-alkaline Palaoco volcanismstarted with a very strong geochemical arc-signature including Ba/La ≈ 60 and La/Nb = 2?3. After aquiesence of 1 Ma the major part of the voluminous Late Palaoco basalts were erupted around 7.5 Ma over afew hundred ka. These are less enriched in Ba and Sr and have compositions like many Holocene rocks of theSouthern Volcanic Zone. Isotopically the Fortunoso I and Palaoco rocks are distinct. Regional volcanism of theCharilehue, Huincán I and II mostly has a moderate arc-type enrichment indicating incipient arc developments.However, Palaoco and La Brea at (c. 35°S) showfull geochemical arc-signature, andwe infer that a frontal arcwasestablished. The subsequent development in the Palaoco-Río Grande area encompasses renewed late Pliocenecalc-alkaline low volume volcanic eruptions (Río Grande group) succeeded in the Late Pleistocene by alkalineOIB-type eruptions (Llancanelo group). In the light of the course of volcanism to the east, in the Nevado area,where late Miocene?Pliocene calc-alkaline volcanism was followed by Late Pliocene?Pleistocene alkaline volcanism.We propose a scenario where the Nazca plate developed an eastwards widening flat slab from which theeast dipping slab before the Late Pliocene translated from Palaoco to Nevado and subsequently retreated passingRío Grande in the Late Pliocene. Alkaline back-arc volcanism was active east of the arc-volcanism and expandedwestwards during the Late Pliocene and Pleistocene.
publishDate 2013
dc.date.none.fl_str_mv 2013-10-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/23943
Dyhr, Charlotte T.; Holm, Paul M.; Llambias, Eduardo Jorge; Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements; Elsevier Science; Journal of Volcanology and Geothermal Research; 266; 1-10-2013; 50-68
0377-0273
CONICET Digital
CONICET
url http://hdl.handle.net/11336/23943
identifier_str_mv Dyhr, Charlotte T.; Holm, Paul M.; Llambias, Eduardo Jorge; Geochemical constraints on the relationship between the Miocene–Pliocene volcanism and tectonics in the Palaoco and Fortunoso volcanic fields, Mendoza Region, Argentina: New insights from 40Ar/39Ar dating, Sr–Nd–Pb isotopes and trace elements; Elsevier Science; Journal of Volcanology and Geothermal Research; 266; 1-10-2013; 50-68
0377-0273
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2013.08.005
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eu_rights_str_mv openAccess
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dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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