Fig. 5. Photomicrographs showing features of the mafic and ultramafic rocks of the Rio Boba sequence. (a) Extensive recrystallization of clinopyroxene (Cpx), orthopyroxene (Opx), plagioclase (Pl) and Fe-Ti oxides (Ox) in Matel oxide gabbronorites. Preferred mineral elongation defines a sub-solidus foliation (Sm). PPL. (b) Elongated grains with lobate grain boundaries of orthopyroxene (Opx), clinopyroxene (Cpx), plagioclase (Pl) and interstitial Fe-Ti oxide (Ox) defining a sub-solidus foliation (Sm) in Matel oxide gabbronorites. CPL. (c) Zoned clinopyroxene-spinel (Cpx-Spl) and amphibole-spinel (Am-Spl) symplectites at the olivine-plagioclase (Ol-Pl) interface in undeformed troctolites. PPL. (d) Euhedral olivine (Ol) in large cumulus plagioclase (Pl). Olivine is partially rimed by coronitic shells of orthopyroxene (Opx). Quita Espuela troctolites. CPL. (e) High-T deformation fabric (Sm) defined by a recrystallized and elongated aggregates of olivine (Ol), clinopyroxene (Cpx), minor orthopyroxene (Opx) and plagioclase (Pl). Note the minor presence of retrograde calcic amphibole (Am). Quita Espuela lower layered gabbronorites. PPL. (f) Slight deformed and dynamically recrystallized gabbronorite, consisting of varying modal proportions of olivine (Ol), orthopyroxene (Opx), clinopyroxene (Cpx) and plagioclase (Pl). Quita Espuela lower layered gabbronorites, CPL. (g) Euhedral olivine (Ol) associated with cumulus clinopyroxene (Cpx) and intercumulus hercynite (Spl) in olivine clinopyroxenite. PPL. (h) Meso to adcumulate texture composed of cumulate clinopyroxene (Cpx) and olivine (Ol) and interstitial plagioclase (Pl) in plagioclase-bearing olivine clinopyroxenite. CPL. Width of field is 1 cm (c and g) and 5 mm (rest of photomicrographs). Appendix B contains the same photomicrographs in complementary parallel/ cross-polarized light (PPL/CPL).