The Iron Formations of the South American Platform

Rosière, Carlos Alberto; Heimann, Adriana; Oyhantçabal, Pedro; Santos, João Orestes Schneider

doi:10.1007/978-3-319-68920-3_18

Cited by 11 publications

(1 citation statement)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Geologically, it is part of the Guanhães basement block, a major morphotectonic feature of the Neoproterozoic Araçuaí belt (Alkmim et al, 2006). The 250 km long and 140 km wide Guanhães block is made up of Archean gneisses, a large volume of Statherian granites of the anorogenic Borrachudos Suite, and tectonically dismembered supracrustal assemblages, which include schists, quartzites and itabirites (Silva, 2000;Silva et al, 2002;Alkmim et al, 2007;Noce et al, 2007;Brito Neves et al, 2014;Rosière et al, 2018). The Horto-Baratinha orebody is hosted by one of these tectonic slices of metasedimentary rocks, specifically by itabirites (metamorphosed iron formation -IF) interlayered with metamorphic psammo-pelitic units (Silveira Braga et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

Depicting the 3D geometry of ore bodies using implicit lithological modeling: An example from the Horto-Baratinha iron deposit, Guanhães block, MG

et al. 2019

Self Cite

View full text Add to dashboard Cite

The definition of geological domains is essential for mineral exploration and is traditionally done manually, section by section, in a laborious, time consuming and subjective process, to construct a 3D model. The technique referred to as implicit modeling is an option to model deposits in a fast and practical manner. This article presents the lithological model of the Horto-Baratinha iron deposit, located in the Antônio Dias municipality, central-eastern part of Minas Gerais state, constructed using the Leapfrog Geo ® software. The deposit is situated at the Guanhães tectonic block that is a basement domain of the Neoproterozoic Araçuaí Orogenic Belt. The deposit is comprised of itabirite-hosted high-grade iron bodies (>60 wt.% Fe) associated with polydeformed mica schists, amphibole schist with a Statherian maximum deposition age, enclosed by Statherian granitoids of the Borrachudos Suite and crosscut by undeformed pegmatite dikes crystallized during Late Ediacaran-Cambrian. The sequence was affected by progressive multiple deformation phases, associated with the collisional stage of the Brasiliano Orogeny (630-560 Ma), generating a dome and basin mesoscale refolding shape. The model points the proximity between highgrade bodies and pegmatite indicating the possibility that the intrusions contribute to the iron mineralization.

show abstract