Figure F39. Textural and mineralogical features of the upper massive flow of Unit 1, Hole 1224D, all in plane-polarized light. A. Medium-grained basalt with minor interstitial patches of devitrified basaltic glass (Sample 200-1224D-3R-1, 50-53 cm). Tabular plagioclases and anhedral clinopyroxene are typical crystal morphologies in such basalts. B. Detail of central devitrified interstitial patch of A. C. Another portion of the same thin section as A with a higher proportion of devitrified interstitial material. Note the typical tabular plagioclases, the stellate plagioclase-clinopyroxene intergrowth at the lower right, and the dendritic projections on the plagioclase crystal at center right that extend into the interstitial patch. D. A euhedral pigeonite crystal projects from the rim of a larger plagioclase into a devitrified interstitial patch (Sample 200-1224D-3R-2, 54-57 cm). E. An interstitial patch is filled with plagioclase dendrites mantling larger crystals plus radiating needles of acicular plagioclase (Sample 200-1224D-3R-1, 50-53 cm). An equant crystal of euhedral titanomagnetite projects into the interstitial material at the top. The small round opaque object just below it is a globular sulfide. F. Same sample as E. A large, strikingly skeletal titanomagnetite has crystallized in another devitrified interstitial patch.

Figure F39. Textural and mineralogical features of the upper massive flow of Unit 1, Hole 1224D, all in plane-polarized light. A. Medium-grained basalt with minor interstitial patches of devitrified basaltic glass (Sample 200-1224D-3R-1, 50-53 cm). Tabular plagioclases and anhedral clinopyroxene are typical crystal morphologies in such basalts. B. Detail of central devitrified interstitial patch of A. C. Another portion of the same thin section as A with a higher proportion of devitrified interstitial material. Note the typical tabular plagioclases, the stellate plagioclase-clinopyroxene intergrowth at the lower right, and the dendritic projections on the plagioclase crystal at center right that extend into the interstitial patch. D. A euhedral pigeonite crystal projects from the rim of a larger plagioclase into a devitrified interstitial patch (Sample 200-1224D-3R-2, 54-57 cm). E. An interstitial patch is filled with plagioclase dendrites mantling larger crystals plus radiating needles of acicular plagioclase (Sample 200-1224D-3R-1, 50-53 cm). An equant crystal of euhedral titanomagnetite projects into the interstitial material at the top. The small round opaque object just below it is a globular sulfide. F. Same sample as E. A large, strikingly skeletal titanomagnetite has crystallized in another devitrified interstitial patch.