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Variations In Mineralogy, Temperature, And Oxygen Fugacity In A Suite Of Strongly Peralkaline Lavas And Tuffs, Pantelleria, Italy., John C. White, Minghua Ren, Don Parker
Variations In Mineralogy, Temperature, And Oxygen Fugacity In A Suite Of Strongly Peralkaline Lavas And Tuffs, Pantelleria, Italy., John C. White, Minghua Ren, Don Parker
EKU Faculty and Staff Scholarship
Eight samples of pantelleritic lava and tuff and a lithic inclusion of trachyte from Pantelleria, Italy, have been thoroughly analyzed with an electron microprobe. These samples reveal five different mineral assemblages if classified by the presence of fayalite, aenigmatite, ilmenite, and magnetite: (1) augite + fayalite + ilmenite + magnetite, (2) augite + fayalite + ilmenite, (3) hedenbergite or sodian hedenbergite + fayalite + ilmenite + aenigmatite + quartz, (4) sodian hedenbergite or aegirine-augite + ilmenite + aenigmatite + quartz ± ferrorichterite, and (5) aegirine-augite + aenigmatite + quartz. Alkali feldspar (Or35–37) is present as the dominant phyric phase in …