I don’t think there’s any question that ancient cultures practiced human sacrifice, but the OP’s question was did any a) target virgins, b) sacrifice to or on volcanoes or c) both.
The Inca practiced child sacrifice, of both male and female children, who were presumably virgins. However, the sacrifices were made on the tops of high mountains.
Other pre-Columbian societies, including the Mayans, also practiced child sacrifice, but not as far as known by means of volcanoes. In fact, the purpose seems often to have been to dedicate a building so the victims were buried in the foundations.
Mt. Bromo, an active volcano in Indonesia, sounds like it could be the prototype for the “volcano sacrifice” idea. From the Wiki article:
Today it looks like the sacrifices are made by flinging them into the caldera from the rim, not into the actual active vent in the center. Here’s a video of a rather inept attempt to sacrifice a chicken. Here’s another video on the ceremonies.
As has been said, approaching the vent of most volcanoes closely enough to throw a victim in is going to be nearly as dangerous for the sacrificers as the sacrificee.
But one must make sacrifices for one’s religion, Colibri!
I’d seen it written manu, perhaps trying to mimic the Polynesian pronunciation better, or trying to avoid role playing games comparisons.
I once saw a documentary on the subject called Joe vs. the Volcanno. If you don’t sacrifice virgins, movies like Sleepless in Seattle and You’ve Got Mail will destroy your culture.