Mapeamento geológico e caracterização das ocorrências de ferro hidrotermal do tipo IOCG ao noroeste do município de Ararendá-Ce

• Autor(a) principal: Castro, João Paulo Sousa de
• Data de Publicação: 2015
• Outros Autores: Uchôa Filho, Regilásio Carvalho
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/41772
• topic: Mapeamento geológico - Santa Quitéria (CE); Arco Magmático - Santa Quitéria (CE); Bacia do Parnaíba; Hidrotermalismo; Geologia; Santa Quitéria Magmatic Arc; Geological mapping; Complexo Ceará; Complexo Tamboril- Santa Quitéria; Iron ore; Hydrothermalism; Parnaíba Basin; Minério de ferro; Ceará Complex; Tamboril- Santa Quitéria Complex

The Santa Quitéria Magmatic Arc has been target of mineral researches in the past years. In 2013, they have been described important occurrences of Fe-skarn at Santa Quitéria and Catunda counties. In the SQMA near Serra Grande in Ararendá-Ce county, significant occurrences of sulfide iron oxides, with minor amounts of apatite have been recently described. This way, a geological mapping was carried out in an area of approximately 67 km2, scale 1: 20,000, northbound the municipal headquarters of Ararendá-Ce, in which are characterized lithostratigraphic units: Ceará Complex, Tamboril-Santa Quitéria Complex, Magmatism Guaribas , Serra Grande Group and covers Cenozoic. Ceara Complex is represented by calc-silicate rocks, while the second is formed by an igneous-anatetic complex which consists predominantly of metatexites and diatexites associated biotite gneiss, gabbros, metadiorites, alkali feldspar granite, porphyritic granites and Phanerozoic sedimentary covers. The Magmatism Guaribas is composed of dioritic and andesitic composition dikes usually with EW . The Serra Grande Group here represented by rocks of Fomação Ipu and Tianguá composed of conglomeratic sandstones and shales of gray coloring. The Cenozoic covers are arranged throughout the area , and are represented mainly by sandstone blocks of Serra Grande Group The iron ore occurrences occur near gabbros, metadiorites and porphyritic granites, being composed of magnetitic-hematític-phosphatic. The iron generated by hydrothermalism, is part of a tectonic environment of previous continental magmatic are to post-orogenic collapse associated with thermal subsidence that initiated the formation of the Parnaíba Basin.