Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil

Detalhes bibliográficos
Autor(a) principal: Rios, D. C.
Data de Publicação: 2007
Outros Autores: Conceição, H., Davis, D. W., Cid, J. Plá, Rosa, M. L. S., Macambira, Moacir José Buenano, McReath, I., Marinho, M. M., Davis, W. J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/15967
Resumo: Texto completo: acesso restrito. p. 1-30
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spelling Rios, D. C.Conceição, H.Davis, D. W.Cid, J. PláRosa, M. L. S.Macambira, Moacir José BuenanoMcReath, I.Marinho, M. M.Davis, W. J.Rios, D. C.Conceição, H.Davis, D. W.Cid, J. PláRosa, M. L. S.Macambira, Moacir José BuenanoMcReath, I.Marinho, M. M.Davis, W. J.2014-09-09T15:53:31Z20070301-9268http://repositorio.ufba.br/ri/handle/ri/15967v. 154, n. 1-2Texto completo: acesso restrito. p. 1-30The Morro do Afonso Syenitic Pluton (MASP) is a small, bimodal suite of lamprophyric and syenitic rocks, located in the Serrinha Nucleus, São Francisco Craton, northeastern Brazil. The unit consists predominantly of alkali feldspar syenite with numerous mafic xenoliths and dykes that are predominantly lamprophyric. The syenite shows geochemical and isotopic features typical of the Roman potassic magmas, i.e. low TiO2 (up to1.2%), low K2O/Al2O3 (0.33–0.49), strong enrichment in LILE, and high LILE/HFSE ratios. Fractionation, mainly of clinopyroxene and amphibole, explains the transition from lamprophyre to syenite. Magma mixing is required to explain the most evolved compositions. MASP syenites have Paleoproterozoic crystallization ages (2.11 Ga). The Nd isotope composition of mafic and felsic phases are similar (εNdmafic = −2.36 to −2.61 and εNdfelsic = −2.47) and they have Archaean model ages (TDM = 2.56–2.58 Ga) that match the age of an inherited zircon grain (ca. 2.6 Ga). MASP is similar to many other post-orogenic syenitic plutons distributed over a wide area of São Francisco Craton (SFC), which are closely comparable in age and also typically associated with ultrapotassic lamprophyre. The present results suggest that a major proportion of the potassic–ultrapotassic syenitic rocks of the SFC were emplaced in a narrow time interval from 2111 to 2080 Ma, limiting the time of metamorphism peak of the Transamazonian Orogeny to at least 2.1 Ga. These plutons show some evidence of having interactions with older felsic crustal rocks and are interpreted to be derived from partial melting of lithospheric mantle that was enriched by subduction.Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2014-01-31T14:51:04Z No. of bitstreams: 1 1-s2.0-S0301926806002762-main.pdf: 2511609 bytes, checksum: 80710ba4dc4a26e3e6a5f02fa6569eb8 (MD5)Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2014-09-09T15:53:31Z (GMT) No. of bitstreams: 1 1-s2.0-S0301926806002762-main.pdf: 2511609 bytes, checksum: 80710ba4dc4a26e3e6a5f02fa6569eb8 (MD5)Made available in DSpace on 2014-09-09T15:53:31Z (GMT). No. of bitstreams: 1 1-s2.0-S0301926806002762-main.pdf: 2511609 bytes, checksum: 80710ba4dc4a26e3e6a5f02fa6569eb8 (MD5) Previous issue date: 2007http://dx.doi.org/10.1016/j.precamres.2006.11.015reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBASyeniteGeochronologyUltrapotassicLamprophyresPaleoproterozoicPaleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, BrazilPrecambrian Researchinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINAL1-s2.0-S0301926806002762-main.pdf1-s2.0-S0301926806002762-main.pdfapplication/pdf2511609https://repositorio.ufba.br/bitstream/ri/15967/1/1-s2.0-S0301926806002762-main.pdf80710ba4dc4a26e3e6a5f02fa6569eb8MD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/15967/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXT1-s2.0-S0301926806002762-main.pdf.txt1-s2.0-S0301926806002762-main.pdf.txtExtracted texttext/plain104910https://repositorio.ufba.br/bitstream/ri/15967/3/1-s2.0-S0301926806002762-main.pdf.txtb464dc8ddb15c04938fe327d51cb13f8MD53ri/159672022-07-05 14:02:48.533oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:02:48Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
dc.title.alternative.pt_BR.fl_str_mv Precambrian Research
title Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
spellingShingle Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
Rios, D. C.
Syenite
Geochronology
Ultrapotassic
Lamprophyres
Paleoproterozoic
title_short Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
title_full Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
title_fullStr Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
title_full_unstemmed Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
title_sort Paleoproterozoic potassic–ultrapotassic magmatism: Morro do Afonso Syenite Pluton, Bahia, Brazil
author Rios, D. C.
author_facet Rios, D. C.
Conceição, H.
Davis, D. W.
Cid, J. Plá
Rosa, M. L. S.
Macambira, Moacir José Buenano
McReath, I.
Marinho, M. M.
Davis, W. J.
author_role author
author2 Conceição, H.
Davis, D. W.
Cid, J. Plá
Rosa, M. L. S.
Macambira, Moacir José Buenano
McReath, I.
Marinho, M. M.
Davis, W. J.
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Rios, D. C.
Conceição, H.
Davis, D. W.
Cid, J. Plá
Rosa, M. L. S.
Macambira, Moacir José Buenano
McReath, I.
Marinho, M. M.
Davis, W. J.
Rios, D. C.
Conceição, H.
Davis, D. W.
Cid, J. Plá
Rosa, M. L. S.
Macambira, Moacir José Buenano
McReath, I.
Marinho, M. M.
Davis, W. J.
dc.subject.por.fl_str_mv Syenite
Geochronology
Ultrapotassic
Lamprophyres
Paleoproterozoic
topic Syenite
Geochronology
Ultrapotassic
Lamprophyres
Paleoproterozoic
description Texto completo: acesso restrito. p. 1-30
publishDate 2007
dc.date.issued.fl_str_mv 2007
dc.date.accessioned.fl_str_mv 2014-09-09T15:53:31Z
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://repositorio.ufba.br/ri/handle/ri/15967
dc.identifier.issn.none.fl_str_mv 0301-9268
dc.identifier.number.pt_BR.fl_str_mv v. 154, n. 1-2
identifier_str_mv 0301-9268
v. 154, n. 1-2
url http://repositorio.ufba.br/ri/handle/ri/15967
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.precamres.2006.11.015
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