Prehnite-pumpellyite facies

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The prehnite-pumpellyite facies is a metamorphic facies typical of subseafloor alteration of the oceanic crust around mid-ocean ridge spreading centres. It is a metamorphic grade transitional between

representing a temperature range of 250 to 350 °C and a pressure range of approximately two to seven kilobars. The mineral assemblage is dependent on host composition.

• In mafic rocks the assemblage is chlorite, prehnite, albite, pumpellyite and epidote.
• In
  serpentine, talc, forsterite, tremolite
  and chlorite.
• In
  argillaceous sedimentary rocks the assemblage is quartz, illite, albite, and stilpnomelane
  chlorite.
• In carbonate sediments the assemblage is
  clays, talc, and muscovite
  .

References

• Blatt, Harvey and Robert Tracy, 1995, Petrology: igneous, sedimentary, and metamorphic, Freeman,
  ISBN 0-7167-2438-3