マグマの起源と分化

概要

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The recent high-pressure experiments suggest that tholeiite magma is generated at shallower parts of the upper mantle whereas alkali basalt magma is generated at deeper parts either by fractional crystallization or by partial melting of the upper mantle materials. There is a possibility, however, that alkali basalt magma is produced from tholeiite magma by differentiation involving alkali enrichment near the earth's surface. The field and experimental studies suggest that the differences in the course of differentiation between the tholeiitic and alkali rock series would depend on the silica saturation or silica undersaturation of the magma, and those between the tholeiitic and calc alkali rock series would depend on the oxygen partial perssure in the magma.
特定非営利活動法人日本火山学会の論文
1965-12-20