re: #337 celticdragon

Not really. Anything you just dump into a trench at a subduction boundary will end up being scrapped off into the sedimentary melange as the heavier oceanic basaltic plate is dragged under. It will likely be deeply buried but it is very unlikely that it will actually end up going for the long plunge into the mantle.

Tectonic melanges are interesting geologic assemblages and are typified by high pressure/low temp metamorphism (blue schist-glaocophane).

Geologist?