Well, normally it means a rock that is behaving so plastically that it is behaving as a thick liquid, like what occurs when a rock is pushed down to high pressure and temperature and starts to melt but really hasn't turned into a complete liquid. The reverse can also occur, where a liquid cools to the point where it is largely solidified but still behaves as a thick liquid or very plastic substance.
Since a semi-molten rock is largely solid, but a very plastic solid, plastic deformation features get formed and preserved, and that is what is the key to identifying it as having behaved as a semi-molten material. It would have a mixture of solid and liquid features.
A rock that's semi-motlen.
A rock that's isn't fully molten.
huh?
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