I wouldn`t be able to remember, but it was the ery first area where I encountered the traps.
This sounds like the indestructible magic bulbs that you encounter right after you escape Fort Joy. There are different kinds not just fire and once triggered they will keep producing their magic effect. You should be able to move them with telekinesis or spells. Flying over them is also an option but you won't have the flying spell the first time you encounter them. Also if i remember correctly the first time they get triggered is when you are speaking to the dead heads. You should be able to avoid them all together and reach the hideout without triggering any of them.
A side note: ''Explosions'' are usually the result of fire+oil effects interacting so it might be just oil magic bulbs continuously producing oil that gets reignited by a fire effect and you wouldn't need a continuous fire effect, once ignited the oil bulbs should explode ''forever''.
P.S. i love the Divinity:OS2 spell and environment mechanics :D