> <<I suppose we have a "definition" problem here. I'd say that lava
> flows per se do not contribute to concentration of specific
> minerals to any significant degree. At best they probably give
> you access to some of the heavier core material which would have
> a somewhat different composition of heavier elements.
> If I understand some basic geochemistry (which I may not) the black regions
> of the moon, called seas, are regions of basalt; which I believe is a
> volcanic residue.
Basalt is a residue of lava flows, which may or may not be emitted by
volcanoes, meteorite impacts, or tectonic spreading faults.
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