Talking of metamorphic rocks, does anybody know how ultrahigh metamorphic
rocks, as seen in the Dabie Shan China, are transported from mantle depths
back to the surface without undergoing extensive retrograde metamorphism or
even melting as a result of the rapid decrease in pressure? The ultrahigh
metamorphism must be related to continental collision but what is the
mechanism of relaxation that allows these rocks to move so rapidly towards
the surface?
Sol
***********************************
Solomon Buckman
Department of Earth Science http://147.8.150.90/Sols%20Homepage.htm
University of Hong Kong http://www.hku.hk/earthsci/rock.html
Ph. 852-28571759, Fax 852-25176912
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|