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Contributions to Mineralogy and Petrology

, Volume 64, Issue 2, pp 123–136 | Cite as

Phase equilibria among pumpellyite, lawsonite, epidote and associated minerals in low grade metamorphic rocks

  • E. H. Brown
Article

Abstract

Phase relations of pumpellyite, epidote, lawsonite, CaCO3, paragonite, actinolite, crossite and iron oxide are analysed on an Al-Ca-Fe3+ diagram in which all minerals are projected from quartz, albite or Jadeite, chlorite and fluid. Fe2+ and Mg are treated as a single component because variation in Fe2+/Mg has little effect on the stability of phases on the diagram. Comparison of assemblages in the Franciscan, Shuksan, Sanbagawa, New Caledonia, Southern Italian, and Otago metamorphic terranes reveals several reactions, useful for construction of a petrogenetic grid:
  1. (1)

    lawsonite+crossite + paragonite = epidote+chlorite + albite + quartz + H2O

     
  2. (2)

    lawsonite + crossite = pumpellyite + epidote + chlorite + albite+ quartz + H2O

     
  3. (3)

    crossite + pumpellyite + quartz = epidote + actinolite + albite + chlorite + H2O

     
  4. (4)

    crossite + epidote + quartz = actinolite + hematite + albite + chlorite + H2O

     
  5. (5)

    calcite + epidote + chlorite + quartz = pumpellyite + actinolite + H2O + CO2

     
  6. (6)

    pumpellyite + chlorite + quartz = epidote + actinolite + H2O

     

Keywords

Oxide Iron Quartz Calcite Iron Oxide 
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 1977

Authors and Affiliations

  • E. H. Brown
    • 1
  1. 1.Department of GeologyWestern Washington State CollegeBellinghamUSA

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