Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration
Autor(a) principal: | |
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Data de Publicação: | 2003 |
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Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFBA |
Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ri/3170 |
Resumo: | p. 383-392 |
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Pimentel, Márcio M.Silva, Maria da GlóriaPimentel, Márcio M.Silva, Maria da Glória2011-10-07T13:01:31Z2011-10-07T13:01:31Z20031678-2690http://www.repositorio.ufba.br/ri/handle/ri/3170v. 75, n. 3.p. 383-392The Fazenda Brasileiro gold mineralization is hosted by a gabbroic sill, intrusive into metavolcanicmetasedimentary rocks of the Rio Itapicuru Greenstone Belt, São Francisco Craton. The 2.05 Ga old mineralization is associated with intense shearing and hydrothermal alteration, and the host gabbro is altered to a series of rocks rich in sericite, chlorite, actinolite, carbonate and quartz. Twelve whole-rock samples of the gold mineralization, representing varied degrees of alteration, from rocks with preserved igneous textures to the ore (quartz-carbonate-sulfide-chlorite), were studied by the Sm-Nd method. All analytical points resulted in an isochron (MSWD = 1.9) indicating the age of 2142 +/– 47 Ma (1s) and Epsilon Nd (T) of +1.2. Chlorite-sericite-carbonate rich hydrothermal rocks indicate the age of 2148 +/– 57 Ma and Epsilon Nd (T) of +1.1. The positive Epsilon Nd (T) suggest limited or no contamination with older continental crust, compatible with an oceanic setting for the tholeiites. Combined withREEdata, the Sm-Nd isotopic results reveal that the hydrothermal alteration, although intense, was unable to alter significantly the Sm/Nd ratios of the original igneous rocks and did not cause important scatter of the analytical points, providing a rare example of robust behavior of the isotopic system, even under intense hydrothermal alteration.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2011-10-07T13:01:31Z No. of bitstreams: 1 a09v75n3.pdf: 457677 bytes, checksum: f27428a952585fe916feaf661ddf34b7 (MD5)Made available in DSpace on 2011-10-07T13:01:31Z (GMT). No. of bitstreams: 1 a09v75n3.pdf: 457677 bytes, checksum: f27428a952585fe916feaf661ddf34b7 (MD5) Previous issue date: 2003Rio Itapicuru greenstone beltFazenda BrasileiroPaleoproterozoicgold mineralizationSm- Ndhydrothermal alterationSm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal AlterationAnais da Academia Brasileira de Ciênciasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINALa09v75n3.pdfa09v75n3.pdfapplication/pdf457677https://repositorio.ufba.br/bitstream/ri/3170/1/a09v75n3.pdff27428a952585fe916feaf661ddf34b7MD51LICENSElicense.txtlicense.txttext/plain1918https://repositorio.ufba.br/bitstream/ri/3170/2/license.txtf685196d938cccbb001b807a34d6f45eMD52TEXTa09v75n3.pdf.txta09v75n3.pdf.txtExtracted texttext/plain27124https://repositorio.ufba.br/bitstream/ri/3170/3/a09v75n3.pdf.txt1d28ff02fa3ddbce2b9e9d0de56fe3d9MD53ri/31702022-07-05 14:03:10.168oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:10Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
dc.title.pt_BR.fl_str_mv |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
dc.title.alternative.pt_BR.fl_str_mv |
Anais da Academia Brasileira de Ciências |
title |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
spellingShingle |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration Pimentel, Márcio M. Rio Itapicuru greenstone belt Fazenda Brasileiro Paleoproterozoic gold mineralization Sm- Nd hydrothermal alteration |
title_short |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
title_full |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
title_fullStr |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
title_full_unstemmed |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
title_sort |
Sm-Nd Age of the Fazenda Brasileiro Gabbro, Bahia, Brazil: Example of Robust Behavior of the Sm-Nd Isotopic System Under Extreme Hydrothermal Alteration |
author |
Pimentel, Márcio M. |
author_facet |
Pimentel, Márcio M. Silva, Maria da Glória |
author_role |
author |
author2 |
Silva, Maria da Glória |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Pimentel, Márcio M. Silva, Maria da Glória Pimentel, Márcio M. Silva, Maria da Glória |
dc.subject.por.fl_str_mv |
Rio Itapicuru greenstone belt Fazenda Brasileiro Paleoproterozoic gold mineralization Sm- Nd hydrothermal alteration |
topic |
Rio Itapicuru greenstone belt Fazenda Brasileiro Paleoproterozoic gold mineralization Sm- Nd hydrothermal alteration |
description |
p. 383-392 |
publishDate |
2003 |
dc.date.issued.fl_str_mv |
2003 |
dc.date.accessioned.fl_str_mv |
2011-10-07T13:01:31Z |
dc.date.available.fl_str_mv |
2011-10-07T13:01:31Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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article |
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publishedVersion |
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http://www.repositorio.ufba.br/ri/handle/ri/3170 |
dc.identifier.issn.none.fl_str_mv |
1678-2690 |
dc.identifier.number.pt_BR.fl_str_mv |
v. 75, n. 3. |
identifier_str_mv |
1678-2690 v. 75, n. 3. |
url |
http://www.repositorio.ufba.br/ri/handle/ri/3170 |
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eng |
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eng |
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openAccess |
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