I just ran across a quotation in a well known Physical Geology textbook
(Leet & Judson) in which the authors state that plutonists believe 85% of
the granites are magmatic in origin and 15% are due to granitization. The
Granitists believe that 85% of the granites are metasomatic in origin, 15%
are magmatic. So take your choice! Certainly the prevalent paradigm today
is magmatic, but this leaves the "room problem" as a festering sore.
Art
http://chadwicka.swau.edu