Figure AF8. Variations in (A) Mg# and (B) Ni with depth between 500 and 1000 mbsf, highlighting sequences in Series 3a, mainly corresponding to lithologic Units VII-X. Open squares = oxide gabbros (>1% TiO2), half-solid squares = tonalite, trondhjemite, and diorite (>54% SiO2 and up to 70% SiO2), solid blue circles = differentiated gabbros, including disseminated oxide gabbros (<54% SiO2 and Mg# [= 100 x Mg/(Mg + Fe2+)] < 72.5), solid red circles = olivine gabbros (same as previous but with Mg# > 72.5 up to MgO = 12%), solid black circles = troctolitic gabbros plus troctolites (>12% MgO), solid triangles = olivine pyroxenites (like troctolites but with normative Di > 40%). The narrow arrows show general trends of increasing extent of differentiation with depth.

Figure AF8. Variations in (A) Mg# and (B) Ni with depth between 500 and 1000 mbsf, highlighting sequences in Series 3a, mainly corresponding to lithologic Units VII-X. Open squares = oxide gabbros (>1% TiO₂), half-solid squares = tonalite, trondhjemite, and diorite (>54% SiO₂ and up to 70% SiO₂), solid blue circles = differentiated gabbros, including disseminated oxide gabbros (<54% SiO₂ and Mg# [= 100 x Mg/(Mg + Fe²⁺)] < 72.5), solid red circles = olivine gabbros (same as previous but with Mg# > 72.5 up to MgO = 12%), solid black circles = troctolitic gabbros plus troctolites (>12% MgO), solid triangles = olivine pyroxenites (like troctolites but with normative Di > 40%). The narrow arrows show general trends of increasing extent of differentiation with depth.