Comparação petrográfica e geoquímica entre as subvulcânicas máficas sulfetadas e não sulfetadas do depósito aurífero Pé Quente, Província de Alta Floresta (MT), Cráton Amazônico

• Autor(a) principal: Medeiros, Isabella Da Gama 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/11449/155460; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-06-05/000884158.pdf
• topic: Petrologia; Sedimentos (Geologia); Magmatismo; Mato Grosso

The Alta Floresta Gold Province, southern portion of the Amazon Craton, hosts more than a hundred gold deposits aligned in the direction of Peru-Trairão Lineament. The province primary mineralization are divided into three groups: (1) Au ± Cu (± Bi ± Te ± Ag) disseminated within granitic systems; (2) vein-type Au ± Cu systems; (3) vein-type Au + Zn + Pb ± Cu ± Mo. Mineralizations of type (1) and (2) were interpreted as gold porphyry systems whereas type (3) was interpreted as epithermal gold-systems of low to intermediate sulfidation. Many authors had associated gold metallogenesis to three stages: (1) 1.98-1.93 Ga with the intrusion of the Pé Quente, Novo Mundo, Aragão e Santa Helena plutons; (2) 1.891.87 Ga with the intrusion of Nhandu Granite and Matupá Intrusive Suite; (3) 1.78-1.75 Ga with the intrusion of anorogenic granites associated to Teles Pires Intrusive Suite. However, recent ages obtained for the mineralization are between 1.80 Ga and 1.78 Ga. These ages are equivalent to the ages associated to Colíder Group, Paranaíta Intrusive Suite and Teles Pires Intrusive Suite, which are representative of the third magmatic stage. In this context, the Pé Quente gold deposit presents mineralization of group (1). The host rock of Pé Quente mineralization is commonly intruded by many mafic dykes (target of this study), these mafic dykes can be divided on sulfide-bearing mafic subvulcanics and non-sulfide-bearing mafic subvulcanics. Besides, many other deposits of the province are also intruded by mafic to intermediate dykes. Thus, the objective of this study is to comprehend if the mafic magmatism that generated the sulfide-bearing subvulcanics could be related to the suites of similar age to the gold mineralization. Consequently, the mafic ... (Complete abstract electronic access below)