Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)

Detalhes bibliográficos
Autor(a) principal: Sighinolfi, G.Paolo
Data de Publicação: 1974
Outros Autores: Sakai, Tereza
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/9941
Resumo: Texto completo. Acesso restrito. p. 23–30
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spelling Sighinolfi, G.PaoloSakai, TerezaSighinolfi, G.PaoloSakai, Tereza2013-04-20T15:05:10Z2013-04-20T15:05:10Z19740009-2541http://www.repositorio.ufba.br/ri/handle/ri/9941v. 14, n. 1–2Texto completo. Acesso restrito. p. 23–30The U and Th distribution in K-rich acid metavolcanics affected by postmagmatic processes has been studied. Th (20 ppm) and U (2.41 ppm) average abundances are well within the normal ranges for granitic rocks, but the Th/U values are appreciably higher than most of the values reported. Since the rhyolitic magma is supposed to have been formed by partial melting of pre-existing rocks, the high Th/U ratios may be due: (1) to an extreme magmatic fractionation towards a K-rich trend in the magma chamber or during magma displacement; and (2) to high Th/U ratios in the original material, probably ancient crystalline basemental rocks depleted in U with respect to Th during previous cycles. The possible influence of postmagmatic processes on U and Th distribution is discussed, and evidence of U mobilization and redistribution within the formation is set forth.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-03-05T17:56:47Z No. of bitstreams: 1 22222.pdf: 385185 bytes, checksum: 09af758383365654db211837057a87f8 (MD5)Approved for entry into archive by Rodrigo Meirelles(rodrigomei@ufba.br) on 2013-04-20T15:05:09Z (GMT) No. of bitstreams: 1 22222.pdf: 385185 bytes, checksum: 09af758383365654db211837057a87f8 (MD5)Made available in DSpace on 2013-04-20T15:05:10Z (GMT). No. of bitstreams: 1 22222.pdf: 385185 bytes, checksum: 09af758383365654db211837057a87f8 (MD5) Previous issue date: 1974SalvadorChemical Geologyhttp://dx.doi.org/10.1016/0009-2541(74)90094-1reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAUranium and thorium in potash-rich rhyolites from western Bahia (Brazil)Chemical Geologyinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleenginfo:eu-repo/semantics/openAccessORIGINAL22222.pdf22222.pdfapplication/pdf385185https://repositorio.ufba.br/bitstream/ri/9941/1/22222.pdf09af758383365654db211837057a87f8MD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/9941/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXT22222.pdf.txt22222.pdf.txtExtracted texttext/plain8https://repositorio.ufba.br/bitstream/ri/9941/3/22222.pdf.txt8d1b69dd9bdc9df4a8073c7a8193c7afMD53ri/99412022-07-05 14:03:03.582oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:03Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
dc.title.alternative.pt_BR.fl_str_mv Chemical Geology
title Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
spellingShingle Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
Sighinolfi, G.Paolo
title_short Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
title_full Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
title_fullStr Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
title_full_unstemmed Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
title_sort Uranium and thorium in potash-rich rhyolites from western Bahia (Brazil)
author Sighinolfi, G.Paolo
author_facet Sighinolfi, G.Paolo
Sakai, Tereza
author_role author
author2 Sakai, Tereza
author2_role author
dc.contributor.author.fl_str_mv Sighinolfi, G.Paolo
Sakai, Tereza
Sighinolfi, G.Paolo
Sakai, Tereza
description Texto completo. Acesso restrito. p. 23–30
publishDate 1974
dc.date.issued.fl_str_mv 1974
dc.date.accessioned.fl_str_mv 2013-04-20T15:05:10Z
dc.date.available.fl_str_mv 2013-04-20T15:05:10Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/9941
dc.identifier.issn.none.fl_str_mv 0009-2541
dc.identifier.number.pt_BR.fl_str_mv v. 14, n. 1–2
identifier_str_mv 0009-2541
v. 14, n. 1–2
url http://www.repositorio.ufba.br/ri/handle/ri/9941
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Chemical Geology
publisher.none.fl_str_mv Chemical Geology
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/0009-2541(74)90094-1
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
instname_str Universidade Federal da Bahia (UFBA)
instacron_str UFBA
institution UFBA
reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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