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トーナル岩

トーナル岩
深成岩のQAPF図
Q:石英、A:アルカリ長石、P:斜長石、F:準長石

トーナル岩(とーなるがん、tonalite、トーナライト)は、アルカリ長石をほとんど含まず、石英斜長石有色鉱物からなる深成岩。石英閃緑岩よりも石英が多いものを指すが、石英閃緑岩と同じ扱いをされることもある。

トーナル岩よりもアルカリ長石の割合が大きいのは花崗閃緑岩

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トーナル岩
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