What exactly happens at a continental-continental (cc) convergent boundary? I read myself through the web for the last few days and what I came up with is that such a boundary will start as an oceanic-continental (oc) one until the continental plates meet and then a huge falt mountain range like the Himalaja, Alps or Appalacian Mountains is formed.
At this point the sources I found gave me conflicting information. Either no subduction of the continental plate occurs or the continental plate is subducted and melts somewhere around 90 to 140 km down. Apparently rockes which where once part of the continental plate melt and resurface. I also heard that this is an area of ongoing research and it isn't fully understood what happens at cc convergent boundaries. So...
Does no subduction of the continental plate occur?
Does only a bit of subduction of the continental plate occur, as some of it is pulled down into the deep by the rest of the oceanic plate?
Does subduction occur at cc boundaries as on oo and oc boundaries, just slower and in a more quiet manner and cc boundaries usually don't last long enough?