Late Neoproterozoic–Cambrian granitic magmatism in the Araçuaí orogen (Brazil), the eastern brazilian pegmatite province and related mineral resources.
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2011
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The Araçuí orogen extends from the eastern edge of the São Francisco craton to the
Atlantic margin, in southeastern Brazil. Orogenic igneous rocks, formed from c. 630 to
c. 480 Ma, cover one third of this huge area, building up the Eastern Brazilian Pegmatite Province
and the most important dimension stone province of Brazil. G1 supersuite (630–585 Ma) mainly
consists of tonalite to granodiorite, with mafic to dioritic facies and enclaves, representing a continental
calc-alkaline magmatic arc. G2 supersuite mostly includes S-type granites formed during
the syn-collisional stage (585–560 Ma), from relatively shallow two-mica granites and related
gem-rich pegmatites to deep garnet-biotite granites that are the site of yellow dimension stone
deposits. The typical G3 rocks (545–525 Ma) are non-foliated garnet-cordierite leucogranites,
making up autochthonous patches and veins. At the post-collisional stage (530–480 Ma), G4
and G5 supersuites were generated. The S-type G4 supersuite mostly consists of garnet-bearing
two-mica leucogranites that are the source of many pegmatites mined for tourmalines and
many other gems, lithium (spodumene) ore and industrial feldspar. G5 supersuite, consisting of
high-K–Fe calc-alkaline to alkaline granitic and/or charnockitic to dioritic/noritic intrusions,
is the source of aquamarine-topaz-rich pegmatites but mainly of a large dimension stone
production.
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SOARES, A. C. P. et al. Late Neoproterozoic–Cambrian granitic magmatism in the Araçuaí orogen (Brazil), the eastern brazilian pegmatite province and related mineral resources. Geological Society Special Publication, v. 350, p. 25-51, 2011. Disponível em: <http://sp.lyellcollection.org/content/350/1/25.full.pdf+html>. Acesso em: 20 de jun. 2017.