Mapeamento geológico e estrutural, Morro da Viúva, Jacobina-BA

• Autor(a) principal: Andrade, Cleberson Ernandes de [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149727; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-25/000876450.pdf
• topic: Geologia estrutural; Mapeamento geologico; Metamorfismo (Geologia); Ouro; Geologia estratigráfica; Jacobina, Serra de (BA)

This paper aims to present a geological and structural mapping of southern portion of Serra de Jacobina in a scale of 1:10.000, covering an area of approximately 5,5 Km2, located in a mining project area owned by Yamana Gold Inc. in the town of Jacobina - BA. The area of this project is inserted in São Francisco Craton geologic context, where metassedimentary sequences belonging to the pré-Espinhaço sequence were mapped, which is related to the Jacobina Group (maximun deposition age 3.4 Ga) comprising the Serra do Córrego Formation. This geologic unit is composed by metaconglomerates (mineralized in Au) with quartzites intercalations. Other geologic formation, known as Rio do Ouro, is constituted by quartzites. This metassedimentary sequence has a tectonic contact with the embasement, which is described as a combination of TTG composition gneiss corresponding to the Mairi Complex (3,4 Ga). In terms of intrusions in the described metassedimentary sequence there are metamaphic and metaultramaphic dykes. The metassedimentary sequence + metaultramapchic and maphic dykes were metamorphosed in a high grade green schists facies. Two deformational events were characterized in the region, with Dn event well marked by Sn foliation and large folds in the central portion of the study area. Post-Dn event is defined mainly by small folds and faults with dextral movement. The area has a high prospective potential, where Au exploration has been taking place since seventeenth century