First of all, absent a national calamity, secession will never happen. As soon as the Fed's decided that Texas was serious about it, every Texas leader involved would be arrested on all sorts of made-up charges. Say hello to the FBI at your doorstep, backed by the 101st Airborne.
But if secession did happen, I'm guessing that the assets would be peaceably divided, much like what happened when the Ukraine seceded from the old USSR.
101st got Texans in it too.