You raised too small preflop, giving around
25% pot odds to a low pair to call you. He just have to call
40 more for a pot of
110 while he already limped
20, he's not going to fold, especially with a low pair.
On flop you should have C-bet to find where you're of at least around
Since you checked, he realized he's not going to get more money in the pot, therefore he
pot-bet quickly on the turn, not wasting any more time.
When someone checks the flop and bets big on the turn, that's always the sign of a strong hand, trying to slowplay but didn't succeeded, but it all depends on the opponent of course. An aggro raising much on the turn may signify a
A7 hand trying to close the hand brutally, but against a tight opponent you should be way more careful.
Regardless the player type (loose/tight), a dominating hand like
AK/AQ would certainly raised preflop, yet you didn't see such opening, therefore you should think you're not dominated. So, with what hands do you think he's showing such aggression, especially on
turn after showing passivity on the flop?
While you couldn't prevent losing the hand (but also had 4 outs to win this as well), you could as well lose much less by just calling the turn bet and/or river.
Since this was a tournament as well and being in early stages, i would just called down to lose as little as possible. The blinds are small enough that you could keep continue playing if he happened to have a monster.