Platiniferous gold–tourmaline aggregates in the gold–palladium belt of Minas Gerais, Brazil: implications for regional boron metasomatism

  • Alexandre Raphael Cabral
  • Miguel Tupinambá
  • Armin Zeh
  • Bernd Lehmann
  • Michael Wiedenbeck
  • Michael Brauns
  • Rogerio Kwitko-Ribeiro
Short Communication

DOI: 10.1007/s00710-017-0496-0

Cite this article as:
Cabral, A.R., Tupinambá, M., Zeh, A. et al. Miner Petrol (2017). doi:10.1007/s00710-017-0496-0
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Abstract

The platiniferous gold–palladium belt of Minas Gerais, Brazil, forms an approximately 240-km-long, roughly north–south-trending domain that includes numerous auriferous lodes and platiniferous alluvium. The belt transects two Precambrian terranes, the Quadrilátero Ferrífero in the southern part, and the southern Serra do Espinhaço in the northern part. Both terranes were overprinted by regional fluid flow that led to tourmalinisation, with or without hematitisation, and precious-metal mineralisation. Here, we report the occurrence of coarse-grained gold–tourmaline aggregates and integrate recently obtained ages and tourmaline boron-isotope values published elsewhere. One type of aggregate is unique because it has patches that are close to stoichiometric PdPt, in which gold content varies from 2.5 to 33.5 at.%. The gold–tourmaline aggregates seem to be the ultimate expression of the boron metasomatism.

Keywords

Boron Metasomatism PdPt Gold–palladium belt Minas Gerais Brazil 

Copyright information

© Springer-Verlag Wien 2017

Authors and Affiliations

  • Alexandre Raphael Cabral
    • 1
    • 2
  • Miguel Tupinambá
    • 3
  • Armin Zeh
    • 2
  • Bernd Lehmann
    • 1
  • Michael Wiedenbeck
    • 4
  • Michael Brauns
    • 5
  • Rogerio Kwitko-Ribeiro
    • 6
  1. 1.Lagerstätten und RohstoffeTechnische Universität ClausthalClausthal-ZellerfeldGermany
  2. 2.Institut für Angewandte Geowissenschaften - Mineralogie und PetrologieKIT - Karlsruher Institut für Technologie, Campus SüdKarlsruheGermany
  3. 3.Tektos-Geotectonic Research Group, Faculdade de GeologiaUniversidade do Estado do Rio de JaneiroRio Janeiro-RJBrazil
  4. 4.Deutsches GeoForschungsZentrum GFZPotsdamGermany
  5. 5.Curt-Engelhorn-Zentrum ArchäometrieAn-Institut der Universität TübingenMannheimGermany
  6. 6.Vale S.A., Departamento de Tecnologia MineralSanta Luzia-MGBrazil

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