Honestly...who gives a shit...
It's all of 3 seconds of the movie.
Some of you people are WAY WAY too anal about this stuff.
For all we know, the area the damn block is in was subjected to heat at some point and partially melted the ice block AFTER the creature "exploded" out of it.
Seriously...it's obvious that the Norwegian camp used fire during their encounter...so it's not beyond the realm of possibility.
Seems some of you are stuck in the "it has to melt out of the block because that's what it did in the old black and white film" mode.
I'm sure a few of you are upset that the melting wasn't caused by a f**king electric blanket.