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Mineralium Deposita

, Volume 53, Issue 1, pp 1–20 | Cite as

The role of evaporites in the formation of gems during metamorphism of carbonate platforms: a review

  • Gaston Giuliani
  • Jean Dubessy
  • Daniel Ohnenstetter
  • David Banks
  • Yannick Branquet
  • Julien Feneyrol
  • Anthony E. Fallick
  • Jean-Emmanuel Martelat
Invited Paper

Abstract

The mineral and fluid inclusions trapped by gemstones during the metamorphism of carbonate platform successions are precious markers for the understanding of gem genesis. The nature and chemical composition of inclusions highlight the major contribution of evaporites through dissolution or fusion, depending on the temperature of formation from greenschist to granulite facies. The fluids are highly saline NaCl-brines circulating either in an open system in the greenschist facies (Colombian and Afghan emeralds) and with huge fluid-rock metasomatic interactions, or sulphurous fluids (ruby, garnet tsavorite, zoisite tanzanite and lapis-lazuli) or molten salts formed in a closed system with a low fluid mobility (ruby in marble) in the conditions of the amphibolite to granulite facies. These chloride-fluoride-sulphate ± carbonate-rich fluids scavenged the metals essential for gem formation. At high temperature, the anions SO4 2−, NO3 , BO3 and F are powerful fluxes which lower the temperature of chloride- and fluoride-rich ionic liquids. They provided transport over a very short distance of aluminium and/or silica and transition metals which are necessary for gem growth. In summary, the genetic models proposed for these high-value and ornamental gems underline the importance of the metamorphism of evaporites formed on continental carbonate shelves and emphasise the chemical power accompanying metamorphism at moderate to high temperatures of evaporite-rich and organic matter-rich protoliths to form gem minerals.

Keywords

Gems Emerald Ruby Garnet Zoisite Lapis-lazuli Metamorphism Carbonate platform Evaporites Brines Fingerprints Salinity Molten salts Thermal reduction of sulphates 

Notes

Acknowledgements

The authors would like to thank Dr. Bernd Lehmann, Editor of Mineralium Deposita, who invited us to write this paper on the role of evaporites in the formation of metamorphic gems, published in a short version as “Le fluide, l’Arlésienne du métamorphisme” in the Journal Géochronique, no. 136, décembre 2015 entitled “Regards croisés sur le métamorphisme”.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Gaston Giuliani
    • 1
    • 2
  • Jean Dubessy
    • 3
  • Daniel Ohnenstetter
    • 4
  • David Banks
    • 5
  • Yannick Branquet
    • 6
    • 7
  • Julien Feneyrol
    • 8
  • Anthony E. Fallick
    • 9
  • Jean-Emmanuel Martelat
    • 10
  1. 1.Université Paul Sabatier, GET/IRD, UMR CNRS-IRD-CNES 5563ToulouseFrance
  2. 2.Université de Lorraine, CRPG UMR 7358 CNRS-ULVandœuvre-lès-Nancy cedexFrance
  3. 3.Université de Lorraine, GeoRessources UMR 7359 CNRS-ULVandœuvre-lès-NancyFrance
  4. 4.4 rue Nicolas ChopinMarainville-sur-MadonFrance
  5. 5.University of Leeds, School of Earth and Environment, Woodhouse LaneLeedsUK
  6. 6.ISTO, UMR 7327-CNRS/Université d’Orléans/BRGMOrléansFrance
  7. 7.Géosciences-Rennes, UMR6881-CNRS/Université de Rennes I, Campus de BeaulieuRennes CedexFrance
  8. 8.Arethuse Geology, Latitude ArboisLes MillesFrance
  9. 9.Isotope Geosciences Unit, S.U.E.R.CGlasgowUK
  10. 10.Laboratoire de Géologie de Lyon (LGLTPE)Université de Lyon 1, ENSLVilleurbanne CedexFrance

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