TY - JOUR
T1 - Anorthoclase Megacrysts
T2 - Physical Conditions of Formation
AU - Bahat, Dov
PY - 2018/6
Y1 - 2018/6
N2 - 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.
AB - 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.
U2 - 10.1180/minmag.1979.043.326.11
DO - 10.1180/minmag.1979.043.326.11
M3 - Article
SN - 0026-461X
VL - 43
SP - 287
EP - 291
JO - Mineralogical Magazine
JF - Mineralogical Magazine
IS - 326
ER -