Can you find the anorthosite xenolith in this roadcut of diabase? (Hint: it's LARGE.)
Whether a xenolith gets cooked (metamorphosed) or
not depends on a number of factors. It's
certainly common for many xenoliths (but not all)
to have at least a little contact metamorphism at
their margins and some are pervasively
metamorphosed. I don't recall seeing any
evidence of metamorphism in this particular
xenolith, but I didn't linger and examine it
as much as I would have liked to.
So is a xenolith generally going to be
metamorphosed in the process of being surrounded
by magma? If so, is this a metanorthosite
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