Anorthoclase Megacrysts: Physical Conditions of Formation

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Previous interpretations relating to precipitation of anorthoclase megacrysts from alkaline basaltic magmas under high-pressure conditions are contradicted. It is proposed that these feldspars were crystallized above the solvus from hydrous melts at shallow depths, under low-pressure equilibrium conditions. These melts had been considerably enriched with volatiles of sodium, strontium, and barium, and to some extent also of rubidium.
Original languageEnglish GB
Pages (from-to)287-291
JournalMineralogical Magazine
Issue number326
StatePublished - 2018


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