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Especially, replacements of some element with an other element are actively carried out around the Contad section, silicas are conveyed by vapors in this part.
And, it seems that this silica interacts with calcium carbonates and other kinds of rocks.
Then, sites on which calcium atoms are located are 'occupied' by silicon atoms,
the rock wholly turns to be silicic acidic, so that the original character is transmuted into the granitic character.
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