The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism

[EN] We provide a thorough review of the literature on peraluminous magmatism of Late Neoproterozoic and Early Palaeozoic (mostly Late Cambrian-Middle Ordovician) age cropping out in many places around the world (SW South Africa, NE Patagonia, NW Argentina, Colombia, SE Mexico and Guatemala, the Eur...

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Autores: García Arias, M., Morales Cámera, Matías M., Dahlquist, J., Gao, P., Couzinié, S., Díez Montes, Alejandro
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/366102
Acceso en línea:http://hdl.handle.net/10261/366102
https://api.elsevier.com/content/abstract/scopus_id/85192982035
Access Level:acceso abierto
Palabra clave:Porphyritic
Early Palaeozoic
Extensional tectonics
Magmatism
Peraluminous
Peri-Gondwana
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
title The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
spellingShingle The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
García Arias, M.
Porphyritic
Early Palaeozoic
Extensional tectonics
Magmatism
Peraluminous
Peri-Gondwana
title_short The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
title_full The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
title_fullStr The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
title_full_unstemmed The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
title_sort The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatism
dc.creator.none.fl_str_mv García Arias, M.
Morales Cámera, Matías M.
Dahlquist, J.
Gao, P.
Couzinié, S.
Díez Montes, Alejandro
author García Arias, M.
author_facet García Arias, M.
Morales Cámera, Matías M.
Dahlquist, J.
Gao, P.
Couzinié, S.
Díez Montes, Alejandro
author_role author
author2 Morales Cámera, Matías M.
Dahlquist, J.
Gao, P.
Couzinié, S.
Díez Montes, Alejandro
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)
Fondo para la Investigación Científica y Tecnológica (Argentina)
Universidad Nacional de Córdoba (Argentina)
Díez Montes, Alejandro [0000-0003-3215-9174]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Porphyritic
Early Palaeozoic
Extensional tectonics
Magmatism
Peraluminous
Peri-Gondwana
topic Porphyritic
Early Palaeozoic
Extensional tectonics
Magmatism
Peraluminous
Peri-Gondwana
description [EN] We provide a thorough review of the literature on peraluminous magmatism of Late Neoproterozoic and Early Palaeozoic (mostly Late Cambrian-Middle Ordovician) age cropping out in many places around the world (SW South Africa, NE Patagonia, NW Argentina, Colombia, SE Mexico and Guatemala, the European Variscan Massifs and from Turkey to northern Burma through Tibet). Petrographically, these volcanic and plutonic rocks contain K-feldspar phenocrysts and sometimes smaller bluish-quartz phenocrysts in a glassy/fine-grained (volcanic/subvolcanic) or medium- to coarse-grained (plutonic) matrix of quartz, plagioclase, K-feldspar and biotite, with other Al-bearing phases such as muscovite and garnet as minor phases. Notably, amphibole is conspicuously absent. Geochemically, these dacitic (tonalitic) to rhyolitic (granitic) rocks are silica-rich, peraluminous and with a strongly crustal Sr-Nd isotopic signature, pointing to S-type magmatism, but they also show characteristics of I-type subduction (a trace element signature typical of continental-arc magmatism) and A-type (enrichment in Ga) magmatism. A prominent geochemical feature is a marked depletion in Sr, resulting in low to very low Sr/Y ratios (usually <5). This, together with flat HREE slopes, suggests melting at low pressures. The arc signature is inherited from their crustal sources, which may comprise an old crustal basement and sediments derived from Pan-African and from Andean-type orogenic belts. Coeval, volumetrically minor mafic rocks are also common in many outcrops and are part of a bimodal sequence. Researchers have mostly attributed this magmatism to extensional tectonics in a back-arc setting, where the upwelling of the asthenospheric mantle triggered the high-temperature-low-pressure partial melting of a largely metasedimentary (upper continental) crust with little or no contribution from the mantle. In a reconstruction of Early Palaeozoic Gondwana, all outcrops are situated in peri-Gondwanan terranes, implying that they are related to (and the consequence of) rifting processes that led to the opening or aborted opening of several oceans (Rheic, proto-Tethys), reflecting a common evolution of the margin of Gondwana during the Cambrian and Ordovician. Given the similarities in petrography and geochemistry (major and trace elements and Sr-Nd isotopes) and the very large volume, several silicic Large Igneous Provinces have been proposed for some sectors, and the possibility that the entire magmatism comprises a single LIP is evaluated. Although correlations of this magmatism in different regions have been established previously, to our knowledge, this is the first study to integrate detailed petrographic, geochemical and geochronological data from all outcrops and to conclude that the peraluminous porphyritic magmatism reviewed here is the main magmatic expression of extension in the peri-Gondwanan area during the Early Palaeozoic.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/366102
https://api.elsevier.com/content/abstract/scopus_id/85192982035
url http://hdl.handle.net/10261/366102
https://api.elsevier.com/content/abstract/scopus_id/85192982035
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.earscirev.2024.104803
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling The tectonic significance of peri-Gondwanan Late Neoproterozoic-Early Palaeozoic felsic peraluminous magmatismGarcía Arias, M.Morales Cámera, Matías M.Dahlquist, J.Gao, P.Couzinié, S.Díez Montes, AlejandroPorphyriticEarly PalaeozoicExtensional tectonicsMagmatismPeraluminousPeri-Gondwana[EN] We provide a thorough review of the literature on peraluminous magmatism of Late Neoproterozoic and Early Palaeozoic (mostly Late Cambrian-Middle Ordovician) age cropping out in many places around the world (SW South Africa, NE Patagonia, NW Argentina, Colombia, SE Mexico and Guatemala, the European Variscan Massifs and from Turkey to northern Burma through Tibet). Petrographically, these volcanic and plutonic rocks contain K-feldspar phenocrysts and sometimes smaller bluish-quartz phenocrysts in a glassy/fine-grained (volcanic/subvolcanic) or medium- to coarse-grained (plutonic) matrix of quartz, plagioclase, K-feldspar and biotite, with other Al-bearing phases such as muscovite and garnet as minor phases. Notably, amphibole is conspicuously absent. Geochemically, these dacitic (tonalitic) to rhyolitic (granitic) rocks are silica-rich, peraluminous and with a strongly crustal Sr-Nd isotopic signature, pointing to S-type magmatism, but they also show characteristics of I-type subduction (a trace element signature typical of continental-arc magmatism) and A-type (enrichment in Ga) magmatism. A prominent geochemical feature is a marked depletion in Sr, resulting in low to very low Sr/Y ratios (usually <5). This, together with flat HREE slopes, suggests melting at low pressures. The arc signature is inherited from their crustal sources, which may comprise an old crustal basement and sediments derived from Pan-African and from Andean-type orogenic belts. Coeval, volumetrically minor mafic rocks are also common in many outcrops and are part of a bimodal sequence. Researchers have mostly attributed this magmatism to extensional tectonics in a back-arc setting, where the upwelling of the asthenospheric mantle triggered the high-temperature-low-pressure partial melting of a largely metasedimentary (upper continental) crust with little or no contribution from the mantle. In a reconstruction of Early Palaeozoic Gondwana, all outcrops are situated in peri-Gondwanan terranes, implying that they are related to (and the consequence of) rifting processes that led to the opening or aborted opening of several oceans (Rheic, proto-Tethys), reflecting a common evolution of the margin of Gondwana during the Cambrian and Ordovician. Given the similarities in petrography and geochemistry (major and trace elements and Sr-Nd isotopes) and the very large volume, several silicic Large Igneous Provinces have been proposed for some sectors, and the possibility that the entire magmatism comprises a single LIP is evaluated. Although correlations of this magmatism in different regions have been established previously, to our knowledge, this is the first study to integrate detailed petrographic, geochemical and geochronological data from all outcrops and to conclude that the peraluminous porphyritic magmatism reviewed here is the main magmatic expression of extension in the peri-Gondwanan area during the Early Palaeozoic.JAD and MMMC acknowledge the financial support received from the Consejo Nacional de Investigaciones Científicas y Técnicas [PIP 0564]; Fondo para la Investigación Científica y Tecnológica [PICT 2020 0378]; and Secretaría de Ciencia y Tecnología - Universidad Nacional de Córdoba [Consolidar 2023].Peer reviewedElsevierConsejo Nacional de Investigaciones Científicas y Técnicas (Argentina)Fondo para la Investigación Científica y Tecnológica (Argentina)Universidad Nacional de Córdoba (Argentina)Díez Montes, Alejandro [0000-0003-3215-9174]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/366102https://api.elsevier.com/content/abstract/scopus_id/85192982035reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.earscirev.2024.104803Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3661022026-05-22T06:33:51Z
score 15,198674

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