Thank you kindly! Consider it dumped, as soon as I finish sign up and get back to my laptop... should be this afternoon.
That being said, the source of this mystery has been discovered.
A friend of mine, the very same one that introduced me to this game, had decided to 'help me out', apparently.
This was NOT a vanilla game, as I had thought. He had tampered with 'Create World From Advanced Parameters', for the purpose of making it easier for me to discover volcanoes with both metal and flux. Every 'Create New World' that I built was apparently built on this template by default. Also apparently, this template had some strange side effects; in addition to the flushing volcanoes was a notable lack of iron ores and precious metals (silver, gold, aluminum, etc. - tin and copper were quite common; but you can't cast an ax in brass, apparently)... they could all be found, but were comparatively rare despite 'frequent' being chosen for minerals.
This was discovered after creating NUMEROUS worlds, all of which had an unusually high instance of volcanoes with listed flux, and an unusual tendency to have volcanoes which drained at various speeds... in fact, on all the maps generated, flux + volcano = draining volcano. This initial one was, by far, the fastest and most obvious. After expressing my frustration to him, he admitted his 'assistance'.
The changes he had made were apparently based on the wiki. To solve the problem (so I could have a working volcano), I ended up deleting the profile he had created, as I do not know enough about the engine to hand modify it back to a working format. Unfortunately, this profile was 'Large Island'... which I wanted. A workaround was found, however, by simply deleting all of the pre-built profiles. This resulted in a true default of 'Large' which is what I am know using.
My apologies for the confusion. Upload will be here this afternoon.