Abstract
Geology and geochemistry of Bois River Suite, Mara Rosa (GO): evidence of magmatic arc paleoproterozoic
Highlights
The area selected for this study, called the Bois River Headwaters, located in the northwestern portion of the State of Goiás (Brazil), makes up part of the Campinorte Project, between latitudes S 14o03’ and 14o15’ and longitude W 49o12’ and 49o16’ (Figure 1) and represents around 75 km2
The access is facilitated by federal highway BR-153 (Belém-Brasília), for approximately 300 km2, or the highway Brasilia-Barro Alto-Uruaçu, both paved
In the most altered granitic rocks it can be observed lower fractionation between light rare earth element (LREE) and heavy rare earth element (HREE), probably indicating that the process of hydrothermal alteration decreased the relative concentrations of rare earth elements (REE) due to the homogenization that occurred between the elements
Summary
The area selected for this study, called the Bois River Headwaters, located in the northwestern portion of the State of Goiás (Brazil), makes up part of the Campinorte Project, between latitudes S 14o03’ and 14o15’ and longitude W 49o12’ and 49o16’ (Figure 1) and represents around 75 km. The main towns in the area of research are Mara Rosa and Campinorte. This work was part of the dissertation conducted at the University of Brasilia and proposes a revision in geological data, lithogeochemical and mineral chemistry. The following objectives guided the study: de nition of the main granitic facies in the area, its spatial distribution and petrographic characterization and lithogeochemistry the granite host rocks of gold mineralization; study phyllosilicates major phases (biotite and muscovite) granite-related paragenesis. Laboratory techniques were used such as petrographic analysis of transmitted and re ected light, which served for the selection of preferred elds to study mineral chemistry of phyllosilicates. This research was conducted at Microscopy Laboratory of the Institute of Geosciences (University of Brasilia)
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