Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil

Detalhes bibliográficos
Autor(a) principal: Sial, A. N.
Data de Publicação: 1998
Outros Autores: Ferreira, V. P., Fallick, A. E., Cruz, Manoel Jeronimo Moreira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/13474
Resumo: Texto completo. Acesso restrito. p. 457-471
id UFBA-2_25ec912536a6037d5bb0c4182646af58
oai_identifier_str oai:repositorio.ufba.br:ri/13474
network_acronym_str UFBA-2
network_name_str Repositório Institucional da UFBA
repository_id_str 1932
spelling Sial, A. N.Ferreira, V. P.Fallick, A. E.Cruz, Manoel Jeronimo MoreiraSial, A. N.Ferreira, V. P.Fallick, A. E.Cruz, Manoel Jeronimo Moreira2013-11-01T11:50:37Z19980895-9811http://repositorio.ufba.br/ri/handle/ri/13474v. 11, n. 5Texto completo. Acesso restrito. p. 457-471Metaluminous granodioritic–tonalitic plutons intruded low-grade metaturbidites of the Cachoeirinha–Salgueiro terrane and low- to intermediate-grade metasediments of the Macururéterrane, northeastern Brazil, around 630 Ma ago. Four types of amphibole-rich polycrystalline clots, up to 20 cm long, are found within mafic microgranular enclaves or in their granodioritic–tonalitic hosts. Type-I clots are usually angular, with granoblastic textures, composed of amphibole with patchy actinolite cores and magnesiohornblende margins, in polygonal packing where grains commonly display near-120° triple junctions. Interstitial biotite and calcic clinopyroxene are the other component phases. Magnesiohornblende+biotite cumulates form the type-II clots that sometimes constitute an external layer around type-I clots. Actinolite pseudomorphs after clinopyroxene-rich restites form the type-III. A fourth type, texturally similar to type-I clot, contains pyrite as an additional accessory phase and is found only in plutons in the Macururéterrane. Amphibole cores in clots of types I and IV are actinolite with SiO2 around 55%, MgO (6.5%, FeO 10.5% and Al2O3 around 2%, while margins are magnesiohornblende with SiO2 around 50%, FeO≈12%, MgO≈14.5%, and Al2O3≈5%). Amphibole aggregates in type-II clots display compositions identical to those in the granodiorite hosts. Biotite in types I and IV clots show SiO2, TiO2, K2O and CaO equivalent to those in the granodiorite host, but are about 4% lower in FeO and about 3% higher in MgO. Although all studied plutons are oxidized I-type granites, those from the Cachoeirinha–Salgueiro terrane display quartz-corrected w.r. δ18O (+11 to +13‰SMOW) in the range for S-type granites, while in the Macururéterrane values from +9 to +10‰ are observed. Amphibole-rich clots usually have δ18O values 1.5‰ lower than those observed in their corresponding hosts. Initial Sr ratios for plutons and their mafic microgranular enclaves are 0.70598 in the Cachoeirinha–Salgueiro terrane. Host plutons show εNd (0.6 Ga) values from −1.0 to −3.0 and −4.6 to −6.7, respectively in the Cachoeirinha–Salgueiro and Macururéterranes, and δ34S from +1 to +9‰CDT in the Cachoeirinha–Salgueiro terrane. Whole-rock δD values for amphibole clot-bearing granodiorites, mafic microgranular enclaves and clots vary from −69 to −114‰SMOW, a variation much broader than for corresponding δ18O values. Partial fusion of low-T altered basaltic source (amphibolites) generated the calc-alkalic granodioritic–tonalitic magmas in the Cachoeirinha–Salgueiro terrane. Type-I clots are probably fragments or restites of melting of this source. High δ18O in amphibole-rich clots and granodiorite hosts support this hypothesis. Actinolite pseudomorphs after calcic clinopyroxene (type-III clots) attest to the incorporation of extraneous H into host magmas, causing a wide δD isotopic range. In the Macururéterrane, type-IV amphibole-rich clots are restite remnants of dehydration melting of an amphibolite source.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-08-20T19:43:42Z No. of bitstreams: 1 5555555555555555555555.pdf: 982548 bytes, checksum: 16036efdfb7775b1f00528c08b1c7ee6 (MD5)Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-11-01T11:50:37Z (GMT) No. of bitstreams: 1 5555555555555555555555.pdf: 982548 bytes, checksum: 16036efdfb7775b1f00528c08b1c7ee6 (MD5)Made available in DSpace on 2013-11-01T11:50:37Z (GMT). No. of bitstreams: 1 5555555555555555555555.pdf: 982548 bytes, checksum: 16036efdfb7775b1f00528c08b1c7ee6 (MD5) Previous issue date: 1998SalvadorJournal of South American Earth Scienceshttp://dx.doi.org.ez10.periodicos.capes.gov.br/10.1016/S0895-9811(98)00034-0reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAClotCalc-alkalicRestiteAmphibolenortheastern BrazilAmphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern BrazilJournal of South American Earth Sciencesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINAL5555555555555555555555.pdf5555555555555555555555.pdfapplication/pdf982548https://repositorio.ufba.br/bitstream/ri/13474/1/5555555555555555555555.pdf16036efdfb7775b1f00528c08b1c7ee6MD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/13474/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXT5555555555555555555555.pdf.txt5555555555555555555555.pdf.txtExtracted texttext/plain64943https://repositorio.ufba.br/bitstream/ri/13474/3/5555555555555555555555.pdf.txtc55ead36e761bd1b6be8353dc39eb443MD53ri/134742022-07-05 14:03:35.68oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:35Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
dc.title.alternative.pt_BR.fl_str_mv Journal of South American Earth Sciences
title Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
spellingShingle Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
Sial, A. N.
Clot
Calc-alkalic
Restite
Amphibole
northeastern Brazil
title_short Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
title_full Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
title_fullStr Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
title_full_unstemmed Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
title_sort Amphibole-rich clots in calc-alkalic granitoids in the Borborema province, northeastern Brazil
author Sial, A. N.
author_facet Sial, A. N.
Ferreira, V. P.
Fallick, A. E.
Cruz, Manoel Jeronimo Moreira
author_role author
author2 Ferreira, V. P.
Fallick, A. E.
Cruz, Manoel Jeronimo Moreira
author2_role author
author
author
dc.contributor.author.fl_str_mv Sial, A. N.
Ferreira, V. P.
Fallick, A. E.
Cruz, Manoel Jeronimo Moreira
Sial, A. N.
Ferreira, V. P.
Fallick, A. E.
Cruz, Manoel Jeronimo Moreira
dc.subject.por.fl_str_mv Clot
Calc-alkalic
Restite
Amphibole
northeastern Brazil
topic Clot
Calc-alkalic
Restite
Amphibole
northeastern Brazil
description Texto completo. Acesso restrito. p. 457-471
publishDate 1998
dc.date.issued.fl_str_mv 1998
dc.date.accessioned.fl_str_mv 2013-11-01T11:50:37Z
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/13474
dc.identifier.issn.none.fl_str_mv 0895-9811
dc.identifier.number.pt_BR.fl_str_mv v. 11, n. 5
identifier_str_mv 0895-9811
v. 11, n. 5
url http://repositorio.ufba.br/ri/handle/ri/13474
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 Journal of South American Earth Sciences
publisher.none.fl_str_mv Journal of South American Earth Sciences
dc.source.pt_BR.fl_str_mv http://dx.doi.org.ez10.periodicos.capes.gov.br/10.1016/S0895-9811(98)00034-0
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
bitstream.url.fl_str_mv https://repositorio.ufba.br/bitstream/ri/13474/1/5555555555555555555555.pdf
https://repositorio.ufba.br/bitstream/ri/13474/2/license.txt
https://repositorio.ufba.br/bitstream/ri/13474/3/5555555555555555555555.pdf.txt
bitstream.checksum.fl_str_mv 16036efdfb7775b1f00528c08b1c7ee6
1b89a9a0548218172d7c829f87a0eab9
c55ead36e761bd1b6be8353dc39eb443
bitstream.checksumAlgorithm.fl_str_mv MD5
MD5
MD5
repository.name.fl_str_mv Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)
repository.mail.fl_str_mv
_version_ 1808459455395790848

Registros relacionados