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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Petrologia do stock granítico Glória Sul, Faixa Sergipana, setor sul da Província Borborema, Sergipe

Conceição, Joane Almeida da 27 February 2014 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In Sergipana range exists a large volume of granitic rocks, with expression in the Macururé Domain. In this field the granitic bodies are classified as Type Gloria. The Stock Granitic Gloria Sul intruded into the Macururé Domain has an area of approximately 41 km2, with slightly rounded geometry, with rocks showing a large compositional and textural homogeneity, and consist of leucocratic granites whitish mostly stock, showing types of staining gray, equigranular texture. The presence of mafic microgranular enclaves and sometimes it is noticed that the rocks exhibit anisotropic behavior marked by the orientation of mica crystals is evident. Modally rocks of the stock are classified as granites and their enclaves as alkali-feldspar quartz syenite. The rocks have an essential mineralogy consists of quartz, alkali feldspar, plagioclase (albite-oligoclase), muscovite, biotite, diopside and hornblende and magmatic epidote as accessory minerals, sphene, zircon, apatite, carbonate. The chemistry of major elements is characterized by SiO2 contents between 56,38 to 73,19%, Al2O3 from 13,82 to 15,86%, TiO2 from 0,07 to 0,98%, K2O from 1,57 to 7,05%, Na2O between 2,48 to 4,67%, CaO from 0,69 to 5,46%, Fe2O3 from 0,64 to 5,76%, MgO from 0,10 to 4,5%, MnO between 0,01 to 0,12% of P2O5, and 0,02 to 0,58%. The values of the traces show up well differentiated, showing microgranular mafic enclaves that have higher values compared to granite, with levels of Ba variation between 319-1179 ppm, Rb ranging from 55,3 to 351 ppm, Sr ranging from 183,6 to 693,5 ppm, Zr ranging from 54,2 to 224,2 ppm, Nb ranging from 3,4 to 20,8 ppm and Y ranging from 1,6 to 16,7 ppm. These rocks show ETR (ΣETR 38,58 to 299,21 ppm), Lan/Ybn ranging from 12,57 to 137,22 ppm and Eu/Eu* ranging from 0,72 to 1,94 ppm. For a classification of tectonic setting diagram using the parameters Y+Nb versus Rb, studied rocks are positioning themselves in the field of syn-collisional granitoids with the exception of granite with garnet. / Na Faixa Sergipana existe um grande volume de rochas graniticas, com expressividade no Dominio Macurure. Nesse dominio os corpos graniticos sao classificados como Tipo Gloria. O Stock Granitico Gloria Sul intrudido no Dominio Macurure apresenta uma area de aproximadamente 41 km2, com geometria levemente arredondada, com rochas exibindo uma grande homogeneidade composicional e textural, sendo constituidas por granitos leucocraticos de coloracao esbranquicada na maior parte do stock, exibindo tipos de coloracao acinzentada, textura equigranular. E evidente a presenca de enclaves maficos microgranulares e por vezes percebe-se que as rochas exibem anisotropismo marcado pela orientacao dos cristais de micas. Modalmente as rochas do stock sao classificadas como granitos e seus enclaves como alcali-feldspato quartzo sienito. As rochas apresentam como mineralogia essencial constituida por quartzo, feldspato alcalino, plagioclasio (albita.oligoclasio), muscovita, biotita, diopsidio e hornblenda, e como minerais acessorios epidoto magmatico, titanita, zircao, apatita, carbonato. A quimica de elementos maiores e caracterizada por teores de SiO2 entre 56,38.73,19%, Al2O3 entre 13,82.15,86%, TiO2 entre 0,07.0,98%, K2O entre 1,57.7,05%, Na2O entre 2,48.4,67%, CaO entre 0,69.5,46%, Fe2O3 entre 0,64.5,76%, MgO entre 0,10.4,5%, MnO entre 0,01.0,12% e P2O5 entre 0,02.0,58%. Os valores dos elementos tracos mostram-se bem diferenciados, evidenciando que os enclaves maficos microgranulares apresentam valores mais elevados em comparacao aos granitos, com teores de Ba variacao entre 319.1179 ppm, Rb variando entre 55,3.351 ppm, Sr variando entre 183,6.693,5 ppm, Zr variando entre 54,2.224,2 ppm, Nb variando entre 3,4.20,8 ppm e Y variando entre 1,6.16,7 ppm. Estas rochas mostram valores de ETR ( °ETR 38,58. 299,21 ppm), Lan/Ybn variando entre 12,57.137,22 ppm e Eu/Eu* variando entre 0,72. 1,94 ppm. Para uma classificacao do ambiente geotectonico o diagrama utilizando os parametros de Y+Nb versus Rb, as rochas estudadas posicionam-se no campo dos granitoides sin-colisionais com excecao dos granitos com granada.

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