Geologic e geoquímica do batólito Rapakivi Rio Branco, SW do Craton Amazônico - MT

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorAraújo-Ruiz, Larissa Marques Barbosa de
dc.creatorGodoy, Antonio Misson
dc.creatorRuiz, Amarildo Salina
dc.creatorSousa, Maria Zélia Aguiar de
dc.creatorMontano, Luiz Fernando de Mello
dc.date2014-05-27T11:22:27Z
dc.date2016-10-25T18:23:45Z
dc.date2014-05-27T11:22:27Z
dc.date2016-10-25T18:23:45Z
dc.date2007-04-01
dc.date.accessioned2017-04-06T01:24:26Z
dc.date.available2017-04-06T01:24:26Z
dc.identifierGeologia USP - Serie Cientifica, v. 7, n. 1, p. 57-72, 2007.
dc.identifier1519-874X
dc.identifierhttp://hdl.handle.net/11449/69611
dc.identifierhttp://acervodigital.unesp.br/handle/11449/69611
dc.identifier10.5327/Z1519-874X2007000100005
dc.identifier2-s2.0-34249734230.pdf
dc.identifier2-s2.0-34249734230
dc.identifierhttp://dx.doi.org/10.5327/Z1519-874X2007000100005
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/890830
dc.descriptionThe Rio Branco Rapakivi Batholith belongs to the Cachoeirinha Tectonic Domain, part of the Rio Negro-Juruena Geochronological Province located on the southwestern portion of the Amazonian Craton in Mato Grosso, Central Brasil. A systematic geological mapping on a 1:100.000 scale, coupled with petrographic and geochemical studies allowed to redefine this batholithic unit, to recognize faciological variations and to characterize the geochemical features of this rapakivi magmatism. The batholith is constituted by two major plutonic suites, the first forming a basic suite of fine-grained, equigranular, mesoto melanocratic gray to black lithotypes, with usually discontinuous porphyritic varieties located near the margins of the intrusion. The second one is characterized by acid to intermediate rocks constituted by porphyritic granites, in part granophyric, with rapakivi textures. They have K-feldspar phenocrysts of up to 4cm. Three distinct petrographic facies are recognized in this suite: 1. equigranular to pegmatitic monzogranites; 2. red rapakivi leuco-monzogranites; 3. dark red rapakivi monzogranites to quartz-monzonites. Rocks present SiO2 contents from 67% to 73%, show peraluminous to metaluminous compositions and define a high-K calc-alkaline to shoshonitic magmatism in an I- and A-type, post-orogenic to anorogenic intraplate environment. The magmatic processes are associated with the end of the collisional event that consolidated and stabilized the SW part of the Amazonian Craton.
dc.languagepor
dc.relationGeologia USP: Serie Cientifica
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAmazonian craton
dc.subjectAnorogenic
dc.subjectGeochemistry
dc.subjectRapakivi
dc.subjectRio Branco Batolith
dc.subjectbatholith
dc.subjectcalc alkaline rock
dc.subjectcraton
dc.subjectfacies analysis
dc.subjectgranophyre
dc.subjectintraplate process
dc.subjectlithotype
dc.subjectmagmatism
dc.subjectmonzonite
dc.subjectpetrology
dc.subjectphenocryst
dc.subjectpluton
dc.subjectporphyry
dc.subjectrapakivi
dc.subjectshoshonite
dc.subjectAmazonia
dc.subjectBrazil
dc.subjectMato Grosso
dc.subjectSouth America
dc.titleGeologic e geoquímica do batólito Rapakivi Rio Branco, SW do Craton Amazônico - MT
dc.typeOtro


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