2019-09-032019-09-032012FREITAS, Anderson Felipe da Costa. Petrografia e proveniência dos arenitos cambrianos da formação diamantino, Sul do cráton Amazônico, Região de Diamantino, Mato Grosso. Orientador: José Bandeira Cavalcante da Silva Júnior. 2012. 84 f. Trabalho de Curso (Bacharelado em Geologia) - Faculdade de Geologia, Instituto de Geologia, Universidade Federal do Pará, Belém, 2012. Disponível em: http://bdm.ufpa.br/jspui/handle/prefix/1905 . Acesso em:.http://bdm.ufpa.br/jspui/handle/prefix/1905The last sedimentary record of the Paraguay belt, in the southern Amazon craton, central-western Brazil, is represented by siliciclastic depositsof the Neoproterozoic-Cambrian Diamantino Formation belonging to the Alto Paraguai Group. The best exposures of Diamantino Formation occur in the Diamantino city region, State of Mato Grosso, inserted in the Barra dos Bugresforedeep sub-basin. Petrographic analyzes in the sandstones of the three facies associations of the Diamantino Formation, combined with the provenance studies of heavy minerals, paleocurrent measures and detrital zircon dating allowed to determine the probable sourcelands of the Diamantino Formation. Feldspathic greywacke and subarkose predominate in the turbidite facies association, sublitharenite, subarkose and lithic greywacke characterize the prodelta/restricted sea association and litharenite and feldspathic litharenite occur in the delta front deposits. The sandstones were submitted to the eodiagenetic and mesodiagenetic stages, which include mechanical infiltration of clay, hematite and calcite cementation, quartz and feldspar overgrowth, mechanical and chemical compaction. The heavy minerals include zircon, tourmaline, rutile, garnet, and subordinately apatite, sillimanite, calcite, amphibole, pyroxene, chlorite and monazite. The sandstones of Diamantino Formation are supermature but the higher ZTR index (% zircon + tourmaline + rutile) value could be lower due the non-recognition of unstable minerals with iron oxide-hydroxide coatings. Geochronological dating of detrital zircon of delta front association indicate a Neoproterozoic-Cambrian age to the Diamantino Formation, with a minimum deposition age after 541 ± 7 Ma. The provenance of this material would be the thrust belt to the ESE, indicated by paleocurrent data of deltaic lobes with preferential migration towards NW and SW. The metassedimentary rocks of Neoproterozoic Cuiabá Group will be the probable source to the Diamantino sedimentation, concomitant to the initial phase of collisional event that led the stabilization of Northern Paraguay belt in the terminal Neoproterozoic.Acesso AbertoPetrologiaGeologia SedimentarPetrografiaFormação DiamantinoSul do Cráton AmazônicoMato Grosso - MTCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIATrabalho de Curso - Graduação - Monografia