Figure F25. A. Fo (Mg/[Mg + Fe]) of olivine as a function of anthorite (An) of plagioclase. B. Mg# (Mg/[Mg + Fetotal]) ratio of augite as a function of An of plagioclase. Curves are modeled liquid lines of descent for Atlantis II Fracture Zone basaltic glass compositions (5-3, AII93-5). Near-horizontal lines mark the income of augite (aug) and Fe-Ti oxide minerals (ox), respectively. See text for calculation methods and discussion.

Figure F25. A. Fo (Mg/[Mg + Fe]) of olivine as a function of anthorite (An) of plagioclase. B. Mg# (Mg/[Mg + Fe^total]) ratio of augite as a function of An of plagioclase. Curves are modeled liquid lines of descent for Atlantis II Fracture Zone basaltic glass compositions (5-3, AII93-5). Near-horizontal lines mark the income of augite (aug) and Fe-Ti oxide minerals (ox), respectively. See text for calculation methods and discussion.