Weston Cage -- With This THOR Ring, I Thee Wed

Before walking down the aisle in New Orleans on Sunday, Nic Cage's son Weston Cage held a ceremonial bonfire to exchange rings with Nikki Williams in Tennessee on Friday.

With a couple of close friends looking on, Weston presented Nikki with an impressive emerald and diamond band ... while Weston got a ring featuring Marvel superhero Thor ... the hammer-wielding god of thunder.

We're told Weston delivered a pretty emotional speech in front of the fire ... but as he was finishing up, several fire trucks raced to the scene after receiving calls from people concerned about the blaze...

Weston explained the situation to the firemen ... and everyone was allowed to go along their way without further incident.