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Late Neoproterozoic–Cambrian granitic magmatism in the Araçuaí orogen (Brazil), the Eastern Brazilian Pegmatite Province and related mineral resources

By
A. C. Pedrosa-Soares
A. C. Pedrosa-Soares
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Cristina P. De Campos
Cristina P. De Campos
2
Department of Earth and Environmental Sciences – LMU Theresienstrasse
41/III – 80333, Munich
,
Germany
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Carlos Noce
Carlos Noce
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Luiz Carlos Silva
Luiz Carlos Silva
3
Serviço Geológico do Brasil–CPRM
,
Belo Horizonte, MG
,
Brazil
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Tiago Novo
Tiago Novo
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Jorge Roncato
Jorge Roncato
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Sílvia Medeiros
Sílvia Medeiros
4
Universidade Estadual do Rio de Janeiro
,
UERJ–Faculdade de Geologia, Rio de Janeiro, RJ
,
Brazil
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Cristiane Castañeda
Cristiane Castañeda
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Gláucia Queiroga
Gláucia Queiroga
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Elton Dantas
Elton Dantas
5
Universidade de Brasília, UnB–IG–Laboratório de Geocronologia
,
Asa Norte, Brasília, DF
,
Brazil
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Ivo Dussin
Ivo Dussin
1
Universidade Federal de Minas Gerais
,
IGC–CPMTC, Campus Pampulha, 31270-901 Belo Horizonte, MG
,
Brazil
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Fernando Alkmim
Fernando Alkmim
6
Universidade Federal de Ouro Preto, DEGEO
,
Campus do Cruzeiro, Ouro Preto
,
Brazil
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Published:
January 01, 2011

Abstract

The Araçuaí 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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Contents

Geological Society, London, Special Publications

Granite-Related Ore Deposits

A. N. Sial
A. N. Sial
Federal University of Pernambuco, Recife, Brazil
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J. S. Bettencourt
J. S. Bettencourt
Universidade de Sao Paulo, Brazil
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C. P. De Campos
C. P. De Campos
Ludwig-Maximilians-Universität, Munich, Germany
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V. P. Ferreira
V. P. Ferreira
Federal University of Pernambuco, Recife, Brazil
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Geological Society of London
Volume
350
ISBN electronic:
9781862395985
Publication date:
January 01, 2011

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