You could probably tank the first 2/3 of ICC OK, but people aren't likely to want to trust your tanking, perception-wise. You're wearing a lot of dps gear and PvP gear, which will make people not want to trust your tanking. Your avoidance is really low, so you'll take damage spikes more often than most tanks, making you harder to heal. If I were you, I'd just wait until the expansion comes out and start tanking more then. If you really want to now, I'd go on a Heroic spree and pick up some tanking gear to replace your PvP and dps gear. Also, I'd reforge the crit on all your dps gear to a more tanking type stat, like Parry or Mastery.
Kathy, I said, "I'm lost" though I knew she was sleeping
I'm empty and aching and I don't know why
Counting the cars on the New Jersey Turnpike
They've all gone to look for America