Petrographic characterization of the gold mineralization host rocks of the lavra velha deposit – Ibitiara region, western edge of Chapada Diamantina, Bahia.

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dc.contributor.authorCarlin, Aline de Cassia [UNESP]
dc.contributor.authorZanardo, Antenor [UNESP]
dc.contributor.authorNavarro, Guillermo Rafael Beltran [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:37:49Z
dc.date.available2018-12-11T17:37:49Z
dc.date.issued2018-01-01
dc.description.abstractThe Lavra Velha gold deposit is located in Ibitiara, Bahia’s central west and the western edge of the physiographic domain of the Chapada Diamantina, situated in Paramirim aulacogen, in northern of São Francisco Craton. The deposit, whose hematite sericitic breccias is hosting the mineralization, was recently insert into the IOCG model class (Iron Oxide Cooper Gold). The main objective of the study was the petrographic characterization of the host rocks of the Lavra Velha deposit, whose predominant lithologies are meta-tonalites and meta-quartz diorite. These rocks are completely altered due to hydrothermal process, which predominates under the deformation at low-strain rate, resulting manly in intense sericitization and iron oxide formation. The petrographic analysis suggests that the deposit’s host rocks correspond to metamorphosed, deformed and hydrothermalized portion of Ibitiara Granitoid. The Ibitiara Granitoid intrusion probably occurs at a shallower crust environment, suggesting that the hydrothermal and mineralizer fluids are later. In spite of the Lavra Velha deposit has being classified as IOCG’s class, the tectonic, structural and hydrothermal analysis suggests that the gold mineralization has originated during Espinhaço basin later deformation stage, related to inversion of the Paramirim aulacogen.en
dc.description.affiliationInstituto de Geociências e Ciências Exatas Universidade Estadual Paulista UNESP
dc.description.affiliationUnespInstituto de Geociências e Ciências Exatas Universidade Estadual Paulista UNESP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipUniversidade Estadual Paulista
dc.format.extent253-265
dc.identifier.citationGeociencias, v. 37, n. 2, p. 253-265, 2018.
dc.identifier.issn1980-900X
dc.identifier.issn0101-9082
dc.identifier.scopus2-s2.0-85050409918
dc.identifier.urihttp://hdl.handle.net/11449/180051
dc.language.isopor
dc.relation.ispartofGeociencias
dc.relation.ispartofsjr0,230
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectEspinhaço supergroup
dc.subjectIOCG deposits
dc.subjectLavra velha deposit
dc.subjectParamirim aulacogen
dc.subjectSão francisco craton
dc.titlePetrographic characterization of the gold mineralization host rocks of the lavra velha deposit – Ibitiara region, western edge of Chapada Diamantina, Bahia.en
dc.titleCaracterização petrográfica das rochas encaixantes da mineralização aurífera do depósito lavra velha – Região de Ibitiara, borda oeste da Chapada Diamantina, Bahia.pt
dc.typeArtigo

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Artigos - Petrologia e Metalogenia - IGCE