K-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, Uruguay
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.
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 |
dc.format.extent.es.fl_str_mv | 1 h |
dc.format.mimetype.es.fl_str_mv | application/pdf |
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 |
dc.type.version.none.fl_str_mv | info:eu-repo/semantics/publishedVersion |
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. |
eu_rights_str_mv | openAccess |
format | conferenceObject |
id | COLIBRI_f97eaf303689285a2fc8e1af9a63902f |
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 |
institution | Universidad de la República |
instname_str | Universidad de la República |
language | eng |
language_invalid_str_mv | en |
network_acronym_str | COLIBRI |
network_name_str | COLIBRI |
oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/32986 |
publishDate | 2020 |
reponame_str | COLIBRI |
repository.mail.fl_str_mv | mabel.seroubian@seciu.edu.uy |
repository.name.fl_str_mv | COLIBRI - Universidad de la República |
repository_id_str | 4771 |
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. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)Alkaline rocksGeochemistryIsotopesCenozoicK-Ar geochronology on alkaline volcanic rocks, southern Paraná Basin, UruguayPonenciainfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionreponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaMuzio Sauer, RossanaOlivera Ichazo, LucíaPeel Canabal, ElenaLICENSElicense.txtlicense.txttext/plain; charset=utf-84267http://localhost:8080/xmlui/bitstream/20.500.12008/32986/5/license.txt6429389a7df7277b72b7924fdc7d47a9MD55CC-LICENSElicense_urllicense_urltext/plain; charset=utf-850http://localhost:8080/xmlui/bitstream/20.500.12008/32986/2/license_urla006180e3f5b2ad0b88185d14284c0e0MD52license_textlicense_texttext/html; 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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 |