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International Journal of Earth Sciences

, Volume 104, Issue 2, pp 513–519 | Cite as

Fluid-inclusion microthermometry and the Zr-in-rutile thermometer for hydrothermal rutile

  • Alexandre Raphael CabralEmail author
  • Francisco Javier Rios
  • Lucilia Aparecida Ramos de Oliveira
  • Francisco Robério de Abreu
  • Bernd Lehmann
  • Thomas Zack
  • František Laufek
Short Note

Abstract

The Zr-in-rutile thermometer is well established for the determination of metamorphic temperatures, particularly in high-grade metamorphic terrains, and for sedimentary provenance studies. The robustness of the rutile thermometry has not been tested on hydrothermal systems. Unlike quartz, a common hydrothermal mineral with abundant fluid inclusions, it is difficult to find fluid inclusions in rutile that are suitable for fluid-inclusion microthermometry. Here, we report fluid-inclusion microthermometric measurements in rutile from the auriferous quartz–kaolinite–hematite vein that typifies the gold deposit of Mil Oitavas in the southern Serra do Espinhaço, Minas Gerais, Brazil. Primary fluid inclusions in the rutile record moderately saline (10–12 wt% NaCl equivalent), aqueous–carbonic fluids with a total homogenization temperature of ~250 °C, which were likely trapped at about 300 °C and 2.0 kbar. This temperature is approximately 200 °C lower than that predicted by the Zr-in-rutile thermometer. For hydrothermal conditions of relatively low temperature, direct measurements of homogenization temperatures in rutile-hosted fluid inclusions should be preferred to the Zr-in-rutile thermometer.

Keywords

Hydrothermal rutile Fluid-inclusion microthermometry Zr-in-rutile thermometer Mil Oitavas gold deposit Diamantina Minas Gerais 

Notes

Acknowledgments

The present study was performed during a research project financed by the Deutsche Forschungsgemeinschaft (CA 737/1-1). We gratefully acknowledge FAPEMIG (Project CRA PPM 00179/1), CNPq (Project 307546/2011-0) and FINEP/REDETEC (Project 2715/09). We are also grateful to Dr. Maria Sylvia Dantas, NovaS Group of the Engineering Department of the UFMG, for the Raman measurements. An anonymous reviewer and Osvaldo Rabbia contributed with thoughtful comments to improve the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Alexandre Raphael Cabral
    • 1
    Email author
  • Francisco Javier Rios
    • 2
  • Lucilia Aparecida Ramos de Oliveira
    • 2
    • 3
  • Francisco Robério de Abreu
    • 4
  • Bernd Lehmann
    • 1
  • Thomas Zack
    • 5
  • František Laufek
    • 6
  1. 1.Mineral DepositsTechnische Universität ClausthalClausthal-ZellerfeldGermany
  2. 2.Fluid-Inclusion Laboratory, Department of Mineral Technology and Geology (SETEM)Centro de Desenvolvimento da Tecnologia Nuclear, CDTN/CNENBelo Horizonte-MGBrazil
  3. 3.Instituto de GeociênciasUniversidade Federal de Minas Gerais (UFMG)Belo Horizonte-MGBrazil
  4. 4.Coffey Consultoria e Serviços Ltda.Belo Horizonte-MGBrazil
  5. 5.Department of Earth SciencesUniversity of GothenburgGothenburgSweden
  6. 6.Czech Geological SurveyPrague 5Czech Republic

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