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A major neoproterozoic crustal boundary in the Borborema province of ne Brazil

Silva, Filho A.F.; Guimaraes, Ignez P.; Armstrong, Richard; Rangel da Silva, J M; Van Schmus, W.R.; Farias, D.S.; Ferreira, Valderez P.; Amorim, J.V.A; Souza, K.; Cocentino, L M

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The Borborema Province represents a collage of tectonic blocks amalgamated to Gondwana during the Neoproterozoic. The Pernambuco -Alagoas Domain constitutes the southern part of the Borborema Province, which comprises three subdomains (Garanhuns, Água Branca, and Palmares) separated by shear zones. Investigation of an area across the boundary between the Palmares and Garanhuns subdomains revealed contrasting aerogeophysical fabrics and geological setting with igneous and metasedimentary rocks...[Show more]

dc.contributor.authorSilva, Filho A.F.
dc.contributor.authorGuimaraes, Ignez P.
dc.contributor.authorArmstrong, Richard
dc.contributor.authorRangel da Silva, J M
dc.contributor.authorVan Schmus, W.R.
dc.contributor.authorFarias, D.S.
dc.contributor.authorFerreira, Valderez P.
dc.contributor.authorAmorim, J.V.A
dc.contributor.authorSouza, K.
dc.contributor.authorCocentino, L M
dc.date.accessioned2023-08-22T22:11:21Z
dc.identifier.issn0020-6814
dc.identifier.urihttp://hdl.handle.net/1885/296759
dc.description.abstractThe Borborema Province represents a collage of tectonic blocks amalgamated to Gondwana during the Neoproterozoic. The Pernambuco -Alagoas Domain constitutes the southern part of the Borborema Province, which comprises three subdomains (Garanhuns, Água Branca, and Palmares) separated by shear zones. Investigation of an area across the boundary between the Palmares and Garanhuns subdomains revealed contrasting aerogeophysical fabrics and geological setting with igneous and metasedimentary rocks of Paleoproterozoic and Neoproterozoic ages. The Palmares shear zone divides the studied area into 2 subdomains: 1) Palmares to the south and 2) Garanhuns to the north. Nd isotopic studies show contrasting crustal signatures between the Garanhuns and Palmares subdomains, with Nd TDM model ages ranging from 1.8 to 2.70 Ga for the Garanhuns subdomain and from 0.90 to 1.60 for the Palmares subdomain. The Palmares shear zone constitutes a major crustal boundary, and in pre drift reconstructions may have continuity in Africa as the Tcholliré-Banyo shear zone. The data suggest that the area evolved during two distinct orogenies: 1) Rhyacian-Orosirian (2095 Ma to 1987 Ma), which involved mainly the reworking of Archaean crust, and 2) Cryogenian-Ediacaran (630 Ma to 585 Ma), the so-called Brasiliano-Pan African Orogeny. Our findings, i.e. contrasting isotopic subdomains separated by an important shear zone, suggest that Brasiliano Orogeny, at least in the Pernambuco Alagoas domain, had an accretionary nature.
dc.description.sponsorshipThis work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico [477462/2012-0]; CAPES [3958/13-2]
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherV.H. Winston & Sons
dc.rights© 2021 The authors
dc.sourceInternational Geology Review
dc.subjectBorborema province
dc.subjectshear zone
dc.subjectsotopic subdomains
dc.subjectwestern gondwana
dc.titleA major neoproterozoic crustal boundary in the Borborema province of ne Brazil
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolumeONLINE
dc.date.issued2021
local.identifier.absfor370900 - Physical geography and environmental geoscience
local.identifier.ariespublicationa383154xPUB22208
local.publisher.urlhttps://www.tandfonline.com/
local.type.statusPublished Version
local.contributor.affiliationSilva, Filho A.F., Departamento De Geologia, Universidade Federal De Pernambuco
local.contributor.affiliationGuimaraes, Ignez P., Universidade Federal de Pernambuco
local.contributor.affiliationArmstrong, Richard, College of Science, ANU
local.contributor.affiliationRangel da Silva, J M, Universidade Federal de Pernambuco
local.contributor.affiliationVan Schmus, W.R., University of Kansas
local.contributor.affiliationFarias, D.S., Departamento De Geologia, Universidade Federal De Pernambuco
local.contributor.affiliationFerreira, Valderez P., Universidade Federal de Pernambuco
local.contributor.affiliationAmorim, J.V.A, Departamento De Geologia, Universidade Federal De Pernambuco
local.contributor.affiliationSouza, K., Departamento De Geologia, Universidade Federal De Pernambuco
local.contributor.affiliationCocentino, L M, Universidade Federal de Pernambuco
local.description.embargo2099-12-31
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage27
local.identifier.doi10.1080/00206814.2021.1966681
local.identifier.absseo280107 - Expanding knowledge in the earth sciences
dc.date.updated2022-07-24T08:19:32Z
local.identifier.scopusID2-s2.0-85114038799
local.identifier.thomsonIDWOS:000693299500001
CollectionsANU Research Publications

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