Geochemistry of Precordillera serpentinites, western Argentina
Serpentinites are a powerful tool to evaluate mantle composition and subsequent alteration processes during their tectonic emplacement. Exposures of this type of rocks can be found in the Argentine Precordillera (Cuyania terrane) and Frontal Cordillera, both located in central-western Argentina, wit...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:145070 |
| Acceso en línea: | https://ddd.uab.cat/record/145070 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2015.13.4.1 |
| Access Level: | acceso abierto |
| Palabra clave: | Mafic-ultramafic belt Mid-ocean ridge Listvenites Cuyania terrane Chilenia terrane |
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Geochemistry of Precordillera serpentinites, western Argentinaevidence for multistage hydrothermal alteration and tectonic implications for the Neoproterozoic-early PaleozoicBoedo, F. L.Escayola, M. P.Pérez Luján, S. B.Vujovich, GracielaAriza, J. P.Naipauer, M.Mafic-ultramafic beltMid-ocean ridgeListvenitesCuyania terraneChilenia terraneSerpentinites are a powerful tool to evaluate mantle composition and subsequent alteration processes during their tectonic emplacement. Exposures of this type of rocks can be found in the Argentine Precordillera (Cuyania terrane) and Frontal Cordillera, both located in central-western Argentina, within the Central Andes. In these regions a Neoproterozoic to Devonian mafic-ultramafic belt composed of serpentinites, metabasaltic dikes/sills, pillow lavas (with an Enriched to Normal Mid-Ocean Ridge Basalts (E- to N-MORB) geochemical signature) and mafic granulites crop out, spatially associated with marine metasedimentary rocks. The serpentinite bodies consist of lizardite/chrysotile+brucite+magnetite, with scarce pentlandite and anhedral reddish-brown Cr-spinel (picotite, pleonaste and spinel sensu stricto) as relict magmatic phases. The original peridotites were moderately-depleted harzburgites (ultramafic cumulates) with an intermediate chemical signature between a mid-ocean ridge and an arc-related ophiolite. Whole-rock Rare Earth Elements (REE) patterns of serpentinites exhibit enriched REE patterns ((La/Yb)CN=13-59) regarding CI chondrite with positive Eu anomalies. These features are the result of an interaction between hydrothermal fluid and serpentinites, in which moderate temperature (350º-400ºC), CO2-rich, mildly basic hydrothermal fluid was involved and was responsible for the addition of Ca, Sr and REE to serpentinites. The presence of listvenites (silica-carbonate rocks) in the serpentinite margins allow us to infer another fluid metasomatism, where lowtemperatures (<250ºC), highly-oxidized, highly-acid fluid lead to the precipitation of silica. The association of these metasomatized serpentinite bodies with neoproterozoic continental margin sucessions and MORB magmatism at the suture zone of the Cuyania and Chilenia terranes suggests the development of an oceanic basin between them during the Neoproterozoic-early Paleozoic. 22015-01-0120152015-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/145070https://dx.doi.org/urn:doi:10.1344/GeologicaActa2015.13.4.1reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1450702026-06-06T12:50:31Z |
| dc.title.none.fl_str_mv |
Geochemistry of Precordillera serpentinites, western Argentina evidence for multistage hydrothermal alteration and tectonic implications for the Neoproterozoic-early Paleozoic |
| title |
Geochemistry of Precordillera serpentinites, western Argentina |
| spellingShingle |
Geochemistry of Precordillera serpentinites, western Argentina Boedo, F. L. Mafic-ultramafic belt Mid-ocean ridge Listvenites Cuyania terrane Chilenia terrane |
| title_short |
Geochemistry of Precordillera serpentinites, western Argentina |
| title_full |
Geochemistry of Precordillera serpentinites, western Argentina |
| title_fullStr |
Geochemistry of Precordillera serpentinites, western Argentina |
| title_full_unstemmed |
Geochemistry of Precordillera serpentinites, western Argentina |
| title_sort |
Geochemistry of Precordillera serpentinites, western Argentina |
| dc.creator.none.fl_str_mv |
Boedo, F. L. Escayola, M. P. Pérez Luján, S. B. Vujovich, Graciela Ariza, J. P. Naipauer, M. |
| author |
Boedo, F. L. |
| author_facet |
Boedo, F. L. Escayola, M. P. Pérez Luján, S. B. Vujovich, Graciela Ariza, J. P. Naipauer, M. |
| author_role |
author |
| author2 |
Escayola, M. P. Pérez Luján, S. B. Vujovich, Graciela Ariza, J. P. Naipauer, M. |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Mafic-ultramafic belt Mid-ocean ridge Listvenites Cuyania terrane Chilenia terrane |
| topic |
Mafic-ultramafic belt Mid-ocean ridge Listvenites Cuyania terrane Chilenia terrane |
| description |
Serpentinites are a powerful tool to evaluate mantle composition and subsequent alteration processes during their tectonic emplacement. Exposures of this type of rocks can be found in the Argentine Precordillera (Cuyania terrane) and Frontal Cordillera, both located in central-western Argentina, within the Central Andes. In these regions a Neoproterozoic to Devonian mafic-ultramafic belt composed of serpentinites, metabasaltic dikes/sills, pillow lavas (with an Enriched to Normal Mid-Ocean Ridge Basalts (E- to N-MORB) geochemical signature) and mafic granulites crop out, spatially associated with marine metasedimentary rocks. The serpentinite bodies consist of lizardite/chrysotile+brucite+magnetite, with scarce pentlandite and anhedral reddish-brown Cr-spinel (picotite, pleonaste and spinel sensu stricto) as relict magmatic phases. The original peridotites were moderately-depleted harzburgites (ultramafic cumulates) with an intermediate chemical signature between a mid-ocean ridge and an arc-related ophiolite. Whole-rock Rare Earth Elements (REE) patterns of serpentinites exhibit enriched REE patterns ((La/Yb)CN=13-59) regarding CI chondrite with positive Eu anomalies. These features are the result of an interaction between hydrothermal fluid and serpentinites, in which moderate temperature (350º-400ºC), CO2-rich, mildly basic hydrothermal fluid was involved and was responsible for the addition of Ca, Sr and REE to serpentinites. The presence of listvenites (silica-carbonate rocks) in the serpentinite margins allow us to infer another fluid metasomatism, where lowtemperatures (<250ºC), highly-oxidized, highly-acid fluid lead to the precipitation of silica. The association of these metasomatized serpentinite bodies with neoproterozoic continental margin sucessions and MORB magmatism at the suture zone of the Cuyania and Chilenia terranes suggests the development of an oceanic basin between them during the Neoproterozoic-early Paleozoic. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2 2015-01-01 2015 2015-01-01 |
| dc.type.none.fl_str_mv |
Article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
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article |
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https://ddd.uab.cat/record/145070 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2015.13.4.1 |
| url |
https://ddd.uab.cat/record/145070 https://dx.doi.org/urn:doi:10.1344/GeologicaActa2015.13.4.1 |
| dc.language.none.fl_str_mv |
Inglés eng |
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Inglés |
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eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-sa/3.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-sa/3.0/ |
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openAccess |
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application/pdf |
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