not bad. truthfully though, that carnosaur is going to be pulped. my personal opinion is that Giganotosaurus is a solitary hunter that steals food from smaller Mapusaurus when it gets the chance.
Truthfully, anything is possible, but as Giganotosaurus was found alone, i do not believe it hunted Argentinosaurus. I think it preferred Andesaurus and Limaysaurs for the most part as they were easier to overpower.