地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
ミグマタイトと花崗岩体をつなぐ
田切 美智雄
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ジャーナル フリー

1997 年 106 巻 5 号 p. 714-720

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Five problems of anatexites and granites have been discussed to study the generation of granitic body. The first is that partial melting takes place in non-equilibrium conditions originated from element-transfer in crystal and from melt-migration in migmatite. Minerals in non-equilibrium relation generally coexist in a migmatite. The second, the partial melting of migmatites is strongly affected by water-mobility in rocks and by increasing rate of temperature. The third, melt-convergence leads to occurrence of vein and to melt-depletion around veins. The fourth, the mechanism of melt-transfer is different between voluminous melt and little melt. Voluminous melt (>50 % melt) can move together with containing crystals. The fifth, there are some limiting relations between crustal thickness to melt and the size and volume of granitic body.

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