Figure F149. Activity-activity diagram for the formation of corona textures between olivine and plagioclase in troctolites, olivine gabbros, and ultramafic cumulates. Arrow A shows the likely path of fluid composition that accompanied the formation of the coronas with the zonation plagioclase-chlorite-tremolite-olivine. Arrow B shows the path for a corona that contains a talc zone as well. P = pressure, T = temperature.
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