Figure F8. Mg/(Mg + Fe2+) ratio of pyroxenes for the four main lithologic components. The lowermost histogram illustrates the composition of orthopyroxene in gabbronorites. Orthopyroxene is calculated with all iron as Fe2+, whereas iron in augite has been redistributed between Fe3+ and Fe2+ by charge balancing the cations. N = number of analyses.

Figure F8. Mg/(Mg + Fe²⁺) ratio of pyroxenes for the four main lithologic components. The lowermost histogram illustrates the composition of orthopyroxene in gabbronorites. Orthopyroxene is calculated with all iron as Fe²⁺, whereas iron in augite has been redistributed between Fe³⁺ and Fe²⁺ by charge balancing the cations. N = number of analyses.