単純な系において予想される斜長石の累帯構造

概要

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Under the condition of the maximum fractionation, chemical variations were numerically calculated for zoned plagioclase grains crystallized from liquids with various initial compositions in the Ab-An simple system. The thermodynamic data for calculating compositions of coexisting liquid and crystal at a given temperature were obtained from the phase diagrams of Bowen (1913), Lindsley (1966), and Yoder et. al. (1957). The zoning patterns thus obtained are shown graphically in Figs. 5 and 6, in which a radius of crystal grain is represented by the cube root of the value of percentage solidified. Grains crystallized from initially An-rich liquids have a narrow rim with considerable compositional variation arround a large and nearly homogeneous core, while those from Ab-rich liquids gradually change the composition from center to rim.
特定非営利活動法人日本火山学会の論文
1972-06-01