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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 zeolite facies and greenschist facies 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.
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Prehnite-pumpellyite_facies". A list of authors is available in Wikipedia.|