The long life of SAMBA connection in Columbia : A paleomagnetic study of the 1535 Ma Mucajai Complex, northern Amazonian Craton, Brazil

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dc.contributor.author Bispo-Santos, Franklin
dc.contributor.author D’Agrella-Filho, Manoel S.
dc.contributor.author Pesonen, Lauri J.
dc.contributor.author Salminen, Johanna M.
dc.contributor.author Reis, Nelson J.
dc.contributor.author Silva, Julia Massucato
dc.date.accessioned 2020-11-02T02:48:46Z
dc.date.available 2021-12-18T03:45:50Z
dc.date.issued 2020-04
dc.identifier.citation Bispo-Santos , F , D’Agrella-Filho , M S , Pesonen , L J , Salminen , J M , Reis , N J & Silva , J M 2020 , ' The long life of SAMBA connection in Columbia : A paleomagnetic study of the 1535 Ma Mucajai Complex, northern Amazonian Craton, Brazil ' , Gondwana Research , vol. 80 , pp. 285-302 . https://doi.org/10.1016/j.gr.2019.09.016
dc.identifier.other PURE: 128094164
dc.identifier.other PURE UUID: 48d575e5-7e1f-4eb9-8d2b-222c50cb2e8e
dc.identifier.other RIS: urn:1215EDE0FEC414BF7DF04C972ED6B427
dc.identifier.other ORCID: /0000-0001-7410-4193/work/68612719
dc.identifier.other ORCID: /0000-0001-5347-1920/work/68614664
dc.identifier.other WOS: 000522974700013
dc.identifier.uri http://hdl.handle.net/10138/320988
dc.description.abstract In recent years, there has been a significant increase in the paleomagnetic data of the Amazonian Craton, with important geodynamic and paleogeographic implications for the Paleo-Mesoproterozoic Columbia supercontinent (a.k.a., Nuna, Hudsoland). Despite recent increase of paleomagnetic data for several other cratons in Columbia, its longevity and the geodynamic processes that resulted in its formation are not well known. A paleomagnetic study was performed on rocks from the similar to 1535 Ma AMG (Anorthosite-Mangerite-Rapakivi Granite) Mucajai Complex located in the Roraima State (Brazil), in the northern portion of the Amazonian Craton, the Guiana Shield. Thermal and AF treatments revealed northwestern/southeastern directions with upward/downward inclinations for samples from twelve sites. This characteristic remanent magnetization is mainly carried by Ti-poor magnetite and in a lesser amount by hematite. Site mean directions were combined with previous results obtained for three other sites from the Mucajai Complex, producing the dual polarity mean direction: Dm = 132.2 degrees; Im = 35.4 degrees (N = 15; alpha(95) = 12.7 degrees; k = 10.0) and a paleomagnetic pole located at 0.1 degrees E, 38.2 degrees S (A(95) = 12.6 degrees; K = 10.2). The Mucajai pole favours the SAMBA (South AMerica-BAltica) link in a configuration formed by Amazonia and Baltica in Columbia. Also, there is geological and paleomagnetic evidence that the juxtaposition of Baltica and Laurentia at 1.76-1.26 Ga forms the core of Columbia. The present paleomagnetic data predict a long life 1.78-1.43 Ga SAMBA connection forming part of the core of the supercontinent. (c) 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. en
dc.format.extent 18
dc.language.iso eng
dc.relation.ispartof Gondwana Research
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1171 Geosciences
dc.subject Paleomagnetism
dc.subject Mucajai AMG complex
dc.subject Amazonian craton
dc.subject Columbia supercontinent
dc.subject U-PB GEOCHRONOLOGY
dc.subject RAPAKIVI GRANITES
dc.subject POLAR WANDER
dc.subject GEOMAGNETIC-FIELD
dc.subject MAFIC MAGMATISM
dc.subject CENTRAL SWEDEN
dc.subject GUIANA SHIELD
dc.subject LAURENTIA
dc.subject BALTICA
dc.subject ROCKS
dc.title The long life of SAMBA connection in Columbia : A paleomagnetic study of the 1535 Ma Mucajai Complex, northern Amazonian Craton, Brazil en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Department of Geosciences and Geography
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.gr.2019.09.016
dc.relation.issn 1342-937X
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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