“Mean Girls” repeated atop the box office with $11.7 million in ticket sales, according to studio estimates Sunday, while a handful of awards contenders sought to make an impact ahead of Oscar nominations Tuesday.With a dearth of new releases in cinemas, Paramount Pictures’ Tina Fey-scripted musical “Mean Girls” pushed its two-week total past $50 million, along with $16.2 million internationally. So far, it’s outpacing the tally for the 2004 original “Mean Girls.”Only one new film debuted in wide release: “I.S.S.,” a modestly budgeted sci-fi thriller starring Ariana DeBose.