Figure F27. (A) Core recovery and lithologies and plagioclase alteration observed in (B) hand specimen and (C) thin section showing an increase in the percentage of plagioclase alteration and in the relative abundance of prehnite relative to chlorite with depth. Downhole changes generally correlate with the boundary between lithologic Units II and III, with higher alteration and prehnite abundance in the Troctolite Series. Ol = olivine, Opx = orthopyroxene.
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