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> Has anyone ever heard of diamonds being formed in metamorphosed
> C-carrying shale deposits (ie slate)? In theory it would be
> possible.
No it wouldn't. Temperatures and pressures are not high enough.
Shales and slates are formed at shallower depths (ie, pressure), and
lower temps, than the upper mantle layers where diamonds formed to be
carried up by kimberlite pipes. Even common igneous rocks, some of
which might contain various carbon compounds, don't give you
diamonds. Still to shallow a depth of formation. Kimberlites are
unique not only in the depth from which the kimberlites are brought
up, but as well, the explosive speeds at which the lava came up,
which didn't allow enough time for the diamonds to be destroyed on
the way up before it cooled enough so the crystals would remain
stable. To date, so far as I know, the only significant sources of
diamond are kimberlites, or diamonds weathered out of them. Oh, that
and impact formed ones from meteorite strikes. Those, when they
occur, do so such that even a small rock may have them in the
millions, but you need a powerful microscope to see them. Extremly
tiny nano sized diamonds....
Peter Rowe
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