Preliminary microprobe studies of the Aubrac lava flows (France) show basalts in the lower part of the series and porphyritic peridotites in the upper part. An increase in porphyries, ascending in the series, suggests an evolution towards a supersaturated limit. The basal basalts contain only one oxide--probably ulvoespinel a higher bed contains ulvoespinel and ilmenite, and the overlying peridotite contains ulvoespinel, ilmenite, and titanomagnetite. A comparison of the results shows a relationship between the mineralogy of the ferrotitanian oxides and the iddingsitization of the olivines.
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