Mapeamento geológico e estudo das ocorrências de ferro do tipo skarn no município de Catunda/CE

• Autor(a) principal: Lira Junior, Jair Araújo de
• Data de Publicação: 2014
• 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/41846
• topic: Depósitos de Fe-(Cu) do tipo skarn; Arco magmático de Santa Quitéria; Fe-cu skarn deposits; Magmatic arc of Santa Quitéria

The geological mapping carried out in the Magmatic Arc of Santa Quitéria segment, located at Catunda-CE county, scale 1:20.000, allowed us to characterize two lithostratigraphic units: Ceará Complex and Tamboril-Santa Quitéria Complex. The first is represented by a set of supracrustals rocks dominated by calc-silicate rocks, marbles and dolostones. While the second is formed by an igneous-anatetic complex which consists predominantly of metatexites and numerous bodies of intrusive granites of varied size, shape and composition. In addition, associated with the last unit there are intermediate metavolcanic rocks represented by meta-andesite. This occurrences of iron ore are developed basically in contact with some intrusive bodies, particularly with the amphibole-biotite syenogranite composition, and calcsilcates rocks, marbles and dolostones. Associated with these mineralizations there are hornfels, endoskarns and exoskarns, being this rocks the product of contact metamorphism and metasomatism between intrusive bodies and carbonate rocks, which allows to characterize such occurrences as Fe-skarn. That mineralization process, known as skarn formation, involves exchange of elements by hydrothermal fluids between igneous pluton and host rock rich in carbonate, being responsible for the accumulation of hydrothermal iron near the contact. In tectonic terms can be inferred for the geological context studied a continental magmatic arc evolved from a passive continental margin.