Archeointensity in Northeast Brazil over the past five centuries

Detalhes bibliográficos
Autor(a) principal: Hartmann, Gelvam André
Data de Publicação: 2010
Outros Autores: Genevey, Agnès, Gallet, Yves, Trindade, Ricardo Ivan Ferreira da, Etchevarne, Carlos Alberto, Goff, Maxime Le, Afonso, Marisa Coutinho
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5677
Resumo: Acesso restrito: Texto completo. p. 340-352.
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spelling Hartmann, Gelvam AndréGenevey, AgnèsGallet, YvesTrindade, Ricardo Ivan Ferreira daEtchevarne, Carlos AlbertoGoff, Maxime LeAfonso, Marisa CoutinhoHartmann, Gelvam AndréGenevey, AgnèsGallet, YvesTrindade, Ricardo Ivan Ferreira daEtchevarne, Carlos AlbertoGoff, Maxime LeAfonso, Marisa Coutinho2012-04-19T19:42:17Z2010-080012-821Xhttp://www.repositorio.ufba.br/ri/handle/ri/5677v. 296, v. 3-4.Acesso restrito: Texto completo. p. 340-352.This study presents the first archeointensity results from Northeast Brazil obtained from 14 groups of architectural brick fragments sampled in the city of Salvador, Bahia State (13°S, 38.5°W) and dated between the middle of the XVIth century and the beginning of the XIXth century. The dating is ascertained by historical documents complemented by archeological constraints, yielding in all cases age uncertainties of less than 50 years. Analyses were carried out using two experimental protocols: 1 — the “zero field–in field” version of the classical Thellier and Thellier method as proposed by Coe (TT-ZI), including partial thermoremanent magnetization (pTRM) and pTRM-tail checks, and 2 — the Triaxe procedure involving continuous high temperature magnetization measurements. Both TRM anisotropy and cooling rate effects were taken into account for the intensity determinations. The cooling rate effect was further explored for the TT-ZI protocol using three increasing slow cooling times (5 h, 10 h and 25 h) between 450 °C and room temperature. Following archeological constraints, the slowest cooling time was retained in our study, yielding decreases of the raw intensity values by 4% to 14%. For each fragment, a mean intensity was computed and retained only when the data obtained from all specimens (between 2 and 6) satisfied a coherence test at ∼5%. A total of 57 fragments (183 specimens) was considered for the computations of site-mean intensity values, with derived standard deviations of less than 8% of the corresponding means. When separately computed using the two experimental techniques, the site-mean intensity values always agree to within 5%. A good consistency is observed between intensity values of similar or close ages, which strengthen their reliability. Our data principally show a significant and continuous decrease in geomagnetic field intensity in Northeast Brazil between the first half of the XVIIth century and the XXth century. One result dated to the second half of the XVIth century further suggests that the geomagnetic field intensity reached a maximum around 1600 AD. This evolution is in good agreement with that expected in the city of Salvador from the available global geomagnetic field models. However, the accuracy of these models appears less well constrained between ∼1550 AD and ∼1650 AD.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-04-19T19:42:17Z No. of bitstreams: 1 __ac.els-cdn.com_S001282...406ced97cf6453da65a3d3bfaeff0.pdf: 1057364 bytes, checksum: a4959ccf0e9705c54d9592f2b15b4938 (MD5)Made available in DSpace on 2012-04-19T19:42:17Z (GMT). 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dc.title.pt_BR.fl_str_mv Archeointensity in Northeast Brazil over the past five centuries
dc.title.alternative.pt_BR.fl_str_mv Earth and Planetary Science Letters
title Archeointensity in Northeast Brazil over the past five centuries
spellingShingle Archeointensity in Northeast Brazil over the past five centuries
Hartmann, Gelvam André
Archeomagnetism
Geomagnetic secular variation
Geomagnetic secular variation
Historical geomagnetic field
Northeast Brazil
Southern hemisphere
title_short Archeointensity in Northeast Brazil over the past five centuries
title_full Archeointensity in Northeast Brazil over the past five centuries
title_fullStr Archeointensity in Northeast Brazil over the past five centuries
title_full_unstemmed Archeointensity in Northeast Brazil over the past five centuries
title_sort Archeointensity in Northeast Brazil over the past five centuries
author Hartmann, Gelvam André
author_facet Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Etchevarne, Carlos Alberto
Goff, Maxime Le
Afonso, Marisa Coutinho
author_role author
author2 Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Etchevarne, Carlos Alberto
Goff, Maxime Le
Afonso, Marisa Coutinho
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Etchevarne, Carlos Alberto
Goff, Maxime Le
Afonso, Marisa Coutinho
Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Etchevarne, Carlos Alberto
Goff, Maxime Le
Afonso, Marisa Coutinho
dc.subject.por.fl_str_mv Archeomagnetism
Geomagnetic secular variation
Geomagnetic secular variation
Historical geomagnetic field
Northeast Brazil
Southern hemisphere
topic Archeomagnetism
Geomagnetic secular variation
Geomagnetic secular variation
Historical geomagnetic field
Northeast Brazil
Southern hemisphere
description Acesso restrito: Texto completo. p. 340-352.
publishDate 2010
dc.date.issued.fl_str_mv 2010-08
dc.date.accessioned.fl_str_mv 2012-04-19T19:42:17Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/5677
dc.identifier.issn.none.fl_str_mv 0012-821X
dc.identifier.number.pt_BR.fl_str_mv v. 296, v. 3-4.
identifier_str_mv 0012-821X
v. 296, v. 3-4.
url http://www.repositorio.ufba.br/ri/handle/ri/5677
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.source.pt_BR.fl_str_mv DOI: 10.1016/j.epsl.2010.05.016
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
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