Contributions to Mineralogy and Petrology

, Volume 109, Issue 1, pp 130–137 | Cite as

A refined garnet - biotite Fe−Mg exchange geothermometer and its application in amphibolites and granulites

  • Somnath Dasgupta
  • Pulak Sengupta
  • Dipayan Guha
  • M. Fukuoka
Article

Abstract

A new formulation of garnet-biotite Fe−Mg exchange thermometer has been developed through statistical regression of the reversed experimental data of Ferry and Spear. Input parameters include available thermo-chemical data for quaternary Fe−Mg−Ca−Mn garnet solid solution and for excess free energy terms, associated with mixing of Al and Ti, in octahedral sites, in biotite solid solution. The regression indicates that Fe−Mg mixing in biotite approximates a symmetrical regular solution model showing positive deviation from ideality withW FeMg bi =1073±490 cal/mol. ΔH r and ΔS r for the garnet-biotite exchange equilibrium were derived to be 4301 cal and 1.85 cal respectively. The resultant thermometer gives consistent results for rocks with a much wider compositional range than can be accommodated by earlier formulations.

Keywords

Free Energy Solid Solution Regular Solution Octahedral Site Positive Deviation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Somnath Dasgupta
    • 1
  • Pulak Sengupta
    • 1
  • Dipayan Guha
    • 1
  • M. Fukuoka
    • 1
  1. 1.Department of Geological SciencesJadavpur UniversityCalcuttaIndia

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