Lower temperatures are transitional with and overlap the prehnite-pumpellyite facies and higher temperatures overlap with and include sub-amphibolite facies.
12.
High-ultrahigh pressure metamorphic path through the zeolite, prehnite-pumpellyite, blueschist, and eclogite facies stability zones of subducted oceanic crust.
13.
Zeolite and prehnite-pumpellyite facies assemblages may or may not be present, thus the onset of metamorphism may only be marked by blueschist facies conditions.
14.
If the illite crystallinity values fall in the 0.25-0.30 ?? range, it corresponds with a metamorphic high anchizone or prehnite-pumpellyite facies.
15.
If the illite crystallinity values fall in the 0.30-0.42 ?? range, it corresponds with a metamorphic low anchizone or prehnite-pumpellyite facies.
16.
It occurs as a primary mineral in nepheline syenites, within hydrothermal cavities in basalts and diabase and in serpentinites in association with zeolites, datolite, prehnite, calcite and serpentine.
17.
Typical glasses, notably formation of spherulites, of perlite, lithophysae, and low-temperature prehnite-pumpellyite facies sub-seafloor alteration is ubiquitous though often overprinted by later metamorphic events.
18.
They are found in serpentine and, especially where the lavas contain nepheline or leucite, are often rich in zeolites, such as analcite, prehnite, natrolite, scolecite, chabazite, heulandite, etc.
19.
As the rock enters the submetamorphic field, generally Zeolite facies metamorphism, clay minerals begin to recrystallize into low-temperature metamorphic phyllite minerals such as chlorite, prehnite, pumpellyite, glauconite and so forth.
20.
The sequence has been affected by very low grade metamorphism in the pumpellyite actinolite facies, with the development of the assemblage pumpellyite + actinolite + chlorite + sericite + albite + carbonate ?clinozoisite ?prehnite in the basic volcanics.
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