K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay

Muzio Sauer, Rossana - Olivera Ichazo, Lucía - Peel Canabal, Elena

Resumen:

The exposed volcanic areas of the Paraná Basin in Uruguay are mainly represented by tholeiitic basalt lava flows and related mafic intrusions, with ages restricted to the lower Cretaceous [1] [2]. Recent studies have shown the occurrence of undersaturated mafic lavas, cross cutting the basaltic pile. They represent the first record of volcanic rocks of alkaline nature for the southernmost portion of the Paraná Basin and for Uruguay, and they were interpreted as three possible volcanic plugs. These porphyritic volcanic rocks correspond to Ne-tephrites, according to the geochemical classification and to their mineralogy composed of olivine (forsterite) and augite phenocrysts in a hypocrystalline groundmass with olivine, augite, plagioclase microlites, nepheline, apatite and opaque minerals, mainly ulvospinel and pyrite [3]. Two samples correspondent to different occurrences have undergone to K-Ar (whole rock) geochronology analyses at Actlabs Laboratories (Canada). The ages obtained fall between 63.7±2.5 Ma and 51.5 ±1.7 Ma. They represent not only the first record of volcanic rocks of alkaline nature for the Paraná Basin in Uruguay but also the first record of Cenozoic volcanism.


Detalles Bibliográficos
2020
ANII: FCE_2019_156437
Alkaline rocks
Geochemistry
Isotopes
Cenozoic
Inglés
Universidad de la República
COLIBRI
https://hdl.handle.net/20.500.12008/32986
Acceso abierto
Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)
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author Muzio Sauer, Rossana
author2 Olivera Ichazo, Lucía
Peel Canabal, Elena
author2_role author
author
author_facet Muzio Sauer, Rossana
Olivera Ichazo, Lucía
Peel Canabal, Elena
author_role author
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collection COLIBRI
dc.contributor.filiacion.none.fl_str_mv Muzio Sauer Rossana, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.
Olivera Ichazo Lucía, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.
Peel Canabal Elena, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.
dc.coverage.spatial.es.fl_str_mv Uruguay
dc.creator.none.fl_str_mv Muzio Sauer, Rossana
Olivera Ichazo, Lucía
Peel Canabal, Elena
dc.date.accessioned.none.fl_str_mv 2022-08-09T13:43:00Z
dc.date.available.none.fl_str_mv 2022-08-09T13:43:00Z
dc.date.issued.none.fl_str_mv 2020
dc.description.abstract.none.fl_txt_mv The exposed volcanic areas of the Paraná Basin in Uruguay are mainly represented by tholeiitic basalt lava flows and related mafic intrusions, with ages restricted to the lower Cretaceous [1] [2]. Recent studies have shown the occurrence of undersaturated mafic lavas, cross cutting the basaltic pile. They represent the first record of volcanic rocks of alkaline nature for the southernmost portion of the Paraná Basin and for Uruguay, and they were interpreted as three possible volcanic plugs. These porphyritic volcanic rocks correspond to Ne-tephrites, according to the geochemical classification and to their mineralogy composed of olivine (forsterite) and augite phenocrysts in a hypocrystalline groundmass with olivine, augite, plagioclase microlites, nepheline, apatite and opaque minerals, mainly ulvospinel and pyrite [3]. Two samples correspondent to different occurrences have undergone to K-Ar (whole rock) geochronology analyses at Actlabs Laboratories (Canada). The ages obtained fall between 63.7±2.5 Ma and 51.5 ±1.7 Ma. They represent not only the first record of volcanic rocks of alkaline nature for the Paraná Basin in Uruguay but also the first record of Cenozoic volcanism.
dc.description.sponsorship.none.fl_txt_mv ANII: FCE_2019_156437
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dc.identifier.citation.es.fl_str_mv Muzio Sauer, R, Olivera Ichazo, L y Peel Canabal, E. K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay [en línea] EN: Goldschmidt Virtual 2020, 21-26 june 2020. Geochemical Society, 2020. 1 h. 10.46427/gold2020.1876
dc.identifier.doi.none.fl_str_mv 10.46427/gold2020.1876
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/20.500.12008/32986
dc.language.iso.none.fl_str_mv en
eng
dc.publisher.es.fl_str_mv Geochemical Society
dc.relation.ispartof.es.fl_str_mv Goldschmidt Virtual 2020, 21-26 june 2020.
dc.rights.license.none.fl_str_mv Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.source.none.fl_str_mv reponame:COLIBRI
instname:Universidad de la República
instacron:Universidad de la República
dc.subject.es.fl_str_mv Alkaline rocks
Geochemistry
Isotopes
Cenozoic
dc.title.none.fl_str_mv K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
dc.type.es.fl_str_mv Ponencia
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
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description The exposed volcanic areas of the Paraná Basin in Uruguay are mainly represented by tholeiitic basalt lava flows and related mafic intrusions, with ages restricted to the lower Cretaceous [1] [2]. Recent studies have shown the occurrence of undersaturated mafic lavas, cross cutting the basaltic pile. They represent the first record of volcanic rocks of alkaline nature for the southernmost portion of the Paraná Basin and for Uruguay, and they were interpreted as three possible volcanic plugs. These porphyritic volcanic rocks correspond to Ne-tephrites, according to the geochemical classification and to their mineralogy composed of olivine (forsterite) and augite phenocrysts in a hypocrystalline groundmass with olivine, augite, plagioclase microlites, nepheline, apatite and opaque minerals, mainly ulvospinel and pyrite [3]. Two samples correspondent to different occurrences have undergone to K-Ar (whole rock) geochronology analyses at Actlabs Laboratories (Canada). The ages obtained fall between 63.7±2.5 Ma and 51.5 ±1.7 Ma. They represent not only the first record of volcanic rocks of alkaline nature for the Paraná Basin in Uruguay but also the first record of Cenozoic volcanism.
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identifier_str_mv Muzio Sauer, R, Olivera Ichazo, L y Peel Canabal, E. K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay [en línea] EN: Goldschmidt Virtual 2020, 21-26 june 2020. Geochemical Society, 2020. 1 h. 10.46427/gold2020.1876
10.46427/gold2020.1876
instacron_str Universidad de la República
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repository.mail.fl_str_mv mabel.seroubian@seciu.edu.uy
repository.name.fl_str_mv COLIBRI - Universidad de la República
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rights_invalid_str_mv Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)
spelling Muzio Sauer Rossana, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.Olivera Ichazo Lucía, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.Peel Canabal Elena, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Geología.Uruguay2022-08-09T13:43:00Z2022-08-09T13:43:00Z2020Muzio Sauer, R, Olivera Ichazo, L y Peel Canabal, E. K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay [en línea] EN: Goldschmidt Virtual 2020, 21-26 june 2020. Geochemical Society, 2020. 1 h. 10.46427/gold2020.1876https://hdl.handle.net/20.500.12008/3298610.46427/gold2020.1876The exposed volcanic areas of the Paraná Basin in Uruguay are mainly represented by tholeiitic basalt lava flows and related mafic intrusions, with ages restricted to the lower Cretaceous [1] [2]. Recent studies have shown the occurrence of undersaturated mafic lavas, cross cutting the basaltic pile. They represent the first record of volcanic rocks of alkaline nature for the southernmost portion of the Paraná Basin and for Uruguay, and they were interpreted as three possible volcanic plugs. These porphyritic volcanic rocks correspond to Ne-tephrites, according to the geochemical classification and to their mineralogy composed of olivine (forsterite) and augite phenocrysts in a hypocrystalline groundmass with olivine, augite, plagioclase microlites, nepheline, apatite and opaque minerals, mainly ulvospinel and pyrite [3]. Two samples correspondent to different occurrences have undergone to K-Ar (whole rock) geochronology analyses at Actlabs Laboratories (Canada). The ages obtained fall between 63.7±2.5 Ma and 51.5 ±1.7 Ma. They represent not only the first record of volcanic rocks of alkaline nature for the Paraná Basin in Uruguay but also the first record of Cenozoic volcanism.Submitted by Faget Cecilia (lfaget@fcien.edu.uy) on 2022-08-09T11:23:14Z No. of bitstreams: 2 license_rdf: 23149 bytes, checksum: 1996b8461bc290aef6a27d78c67b6b52 (MD5) 1876.pdf: 92215 bytes, checksum: 42fd40eecc073b15c10fd121c8778a0b (MD5)Approved for entry into archive by Faget Cecilia (lfaget@fcien.edu.uy) on 2022-08-09T11:50:34Z (GMT) No. of bitstreams: 2 license_rdf: 23149 bytes, checksum: 1996b8461bc290aef6a27d78c67b6b52 (MD5) 1876.pdf: 92215 bytes, checksum: 42fd40eecc073b15c10fd121c8778a0b (MD5)Made available in DSpace by Luna Fabiana (fabiana.luna@seciu.edu.uy) on 2022-08-09T13:43:00Z (GMT). No. of bitstreams: 2 license_rdf: 23149 bytes, checksum: 1996b8461bc290aef6a27d78c67b6b52 (MD5) 1876.pdf: 92215 bytes, checksum: 42fd40eecc073b15c10fd121c8778a0b (MD5) Previous issue date: 2020ANII: FCE_2019_1564371 happlication/pdfenengGeochemical SocietyGoldschmidt Virtual 2020, 21-26 june 2020.Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. 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- Universidad de la Repúblicafalse
spellingShingle K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
Muzio Sauer, Rossana
Alkaline rocks
Geochemistry
Isotopes
Cenozoic
status_str publishedVersion
title K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
title_full K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
title_fullStr K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
title_full_unstemmed K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
title_short K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
title_sort K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
topic Alkaline rocks
Geochemistry
Isotopes
Cenozoic
url https://hdl.handle.net/20.500.12008/32986