Perceptions of a dovish tone help allay recession paranoia.
Gold jumps ahead of the Fed decision, related shares rally after.
Concerns about global growth once again surface.
But metals end above their lows as Iran talks tough.
It erases early losses as several copper names are upgraded.
Metals turn around after the dollar gives up its early gains.
Easing tensions with Iran, and a hawkish Fed keep the pressure on commodities.