Brasilia Belt
Tags: archean gneiss granodiorite paleoproterozoic phyllite quartzite schist tonalit
Description:
The Brasilia Belt resulted from the collision between three cratonic blocks: the Amazonian, the São Francisco-Congo and a third block concealed under Phanerozoic sediments of the Parana Basin. Sedimentary units are mostly preserved in the northern part of the belt, whereas in the southern part where Paracatu is located, there is intense deformation and metamorphism, and contacts between metasedimentary units are primarily tectonic (Rodrigues et al., 2010).
The Brasília Belt has four main components (Rodrigues et al., 2010 and references therein):
- A continental block of Archaean rock units (the Crixás-Goiás region).
- Reworked sialic basement of Paleoproterozoic age, exposed mainly in the Almas-Cavalcante region.
- The Goiás Magmatic Arc, consisting of volcano-sedimentary rocks and tonalite/granodiorite gneisses.
- Thick sedimentary and metasedimentary sequences, including coarse and fine grained sediments with some carbonates, volcanic layers, phyllites, quartzites, and schists.
A series of east-northeast trending thrust faults is developed extensively along the belt. Metamorphic grade increases towards the west as the thickness of the fold belt increases. The timing of deformation is estimated at 800 Ma to 600 Ma during the Brasiliano orogenic cycle.
Simplified geology of the Brasilia Belt:
Deposits
-
Name: Paracatu
Phase: Operations
Mine Type: Pit
Intro:
The Paracatu Mine, also referred to as the Morro do Ouro Mine, is located immediately north of the city of Paracatu and 230 km southeast of the national capital of Brasilia in northwestern Minas Gerais State, Brazil. The Project comprises an open pit mine as well as processing plants, tailings facilities and associated infrastructure. The mine commenced production in 1987 and currently processes ore at a nominal plant throughput rate of 61 Mt/a.
Mineralizations
No mineralizations available.
Placers
No placers available.