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زمینشناسی و معدن::
کمان ماگمایی
Differences in altitude of 10 km between the deep sea trench and volcanoes of the magmatic arc are not unusual.
If the crust of the upper plate in the area of the magmatic arc is oceanic, the Marianas, for example, the magmas are not altered substan- tially and remain mainly basaltic to andesitic in composition (Fig. 7.31).
phism) marks the location of the magmatic arc.
Contact and Abukuma metamor- phism are transitional in magmatic arcs.
located behind the magmatic arc (Fig. 7.36).
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