I live at Rio (GIG) and as far as I know, there are neither oneworld nor star alliance domestic lounges here in Brazil. All them were shut down through the years. Recently TAM said the most important is not having lounges but to fly ontime and without hassles of connecting time. So, you are out of luck...

http://www.melhoresdestinos.com.br/t...domestica.html (only in portuguese, but the news say: "TAM closes SDU lounge and states there will not be any other domestic one")