Looks like Abelisaurid week in south america
A new Abelisaurid is described here from the late Cretaceous of Argentina : Niebla antiqua
For those collectors that have abelisaurid teeth from Argentina this species just adds to the complexity in trying to identify isolated teeth
unfortunately its paywalled
https://www.sciencedirect.com/science/article/abs/pii/S0895981120304582
Got some better photos