dc.contributorSouza, Zorano Sérgio de
dc.contributor
dc.contributorhttp://lattes.cnpq.br/1779023747634147
dc.contributor
dc.contributorhttp://lattes.cnpq.br/1259445348649589
dc.contributorDantas, Elton Luiz
dc.contributor
dc.contributorhttp://lattes.cnpq.br/9718399842317946
dc.contributorVilalva, Frederico Castro Jobim
dc.contributor
dc.contributorhttp://lattes.cnpq.br/6227637633613443
dc.contributorXavier Júnior, Milton Morais
dc.contributor
dc.contributorhttp://lattes.cnpq.br/3128669965557866
dc.creatorSilva, Marcella Samyla de Miranda
dc.date.accessioned2021-03-05T00:00:29Z
dc.date.accessioned2022-10-06T13:25:06Z
dc.date.available2021-03-05T00:00:29Z
dc.date.available2022-10-06T13:25:06Z
dc.date.created2021-03-05T00:00:29Z
dc.date.issued2020-12-15
dc.identifierSILVA, Marcella Samyla de Miranda. Geologia e geofísica de rochas ultramáficas e carbonatitos ediacaranos intrusivos no Complexo Senador Elói de Souza, Maciço São José do Campestre, Província Borborema - NE do Brasil. 2020. 67f. Dissertação (Mestrado em Geodinâmica e Geofísica) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2020.
dc.identifierhttps://repositorio.ufrn.br/handle/123456789/31690
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3968373
dc.description.abstractLocated in the São José do Campestre Massif, the Senador Elói de Souza Complex is a geological unit composed of 3.03 Ga granitic to tonalitic orthogneisses, mafic and ultramafic rocks characterized by metagabbros, metaclinopyroxenites and anorthosites with garnet and oligoclase, with the ultramafic bodies and carbonatites dated by the U-Pb method at 600 ± 03 Ma. These bodies have contact features evidenced through magmatic breccias with carbonate matrix and involving pyroxenite fragments. In addition, field data and 2D gravimetric modeling allowed interpreting carbonatites and pyroxenites as ellipsoidal bodies, the first one less expressive along the borders of the intrusion complex. The analysis of gravimetric data suggests they ate shallow bodies and appear to truncate the low angle structures of the basement gneiss rocks. Clinopyroxenites have a well-preserved igneous texture, a low fractional pattern of rare earth elements [(LaN / YbN) = 8.9-49.8] and negative Eu anomaly of (Eu/Eu* = 0.39-0.88). Carbonatites are calcite-rich, with diopside, phlogopite and olivine as main mafic phases, low concentration of rare earth elements, with parallel and slightly inclined patterns [(LaN /YbN) = 1.5-8.6], in addition to enrichment of rare earth elements lightweight compared to heavy rare earth elements. The distinct geochemical behavior between these lithologies in Harker-type diagrams, in addition to a magmatic gap, suggests partial mixture of magmas. Occurrences of symplectite between clinopyroxene and plagioclase and grossular partially consumed generating scapolite indicate retrogression processes in clinopyroxenite. Recrystallization of calcite, serpentinization of olivine and deformation of phlogopite in carbonatite indicate the action of metamorphic events and fluid-rich (CO2, H2O) metasomatism. The geological and geophysical data reported here may contribute to understand the Ediacaran mantelic events in the Archean domain of the São José do Campestre Massif.
dc.publisherUniversidade Federal do Rio Grande do Norte
dc.publisherBrasil
dc.publisherUFRN
dc.publisherPROGRAMA DE PÓS-GRADUAÇÃO EM GEODINÂMICA E GEOFÍSICA
dc.rightsAcesso Aberto
dc.subjectPiroxenitos e carbonatitos
dc.subjectMaciço São José do Campestre
dc.subjectComplexo Senador Elói de Souza
dc.subjectGeologia e Geofísica
dc.subjectNE do Brasil
dc.titleGeologia e geofísica de rochas ultramáficas e carbonatitos ediacaranos intrusivos no Complexo Senador Elói de Souza, Maciço São José do Campestre, Província Borborema - NE do Brasil
dc.typemasterThesis


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