zone à prehnite et pumpellyite

OBS: zone à prehnite et pumpellyite : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

CONT: Secondary mineral assemblages in Eocene volcanic and volcaniclastic rocks of the Toa Baja drill hole progressively change as a function of depth. Four metamorphic zones are delineated with increasing depth: Ca-clinoptilolite {yields} heulandite {yields} laumontite {yields} prehnite-pumpellyite zone. The deepest belongs to the prehnite-pumpellyite facies, whereas the three zones at shallower depths (< 2,350 m) belong to the zeolite facies.
OBS: prehnite-pumpellyite zone: term used at Natural Resources Canada - Earth Sciences Sector.