What's the difference between a quartz crystal and a watch crystal?
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Following subduction of oceanic crust into the upper mantle at a destructive plate boundary, one finds PARTIAL MELTING of that rock that has high Mg Fe geochemistry. In the partial melting, the minerals that are high in Mg Fe are separated off from the more volatile, felsic material following the principles of BOWEN'S REACTION SERIES. Here a series of partial melts, accompanied by highly significant large volumes of water, result in the ultimate formation of quartz bearing granites.
