Petrological Model,Chemical Composition and Possible Genesis of the Crust Along Yichuan-Yichang Global Geoscience Transect(GGT) in East Qinling
东秦岭河南伊川—湖北宜昌地学断面地壳岩石组成,化学成分及形成机制

On the basis of geochemical study, laboratory study of seismic velocity (Vp) of 99 rock samples at high temperatures and high pressures, geological study, and the QB-1 Multiple Sounding Section of the Qinling Orogenic Belt and its adjacent North China Craton and Yangtze Craton, the models of petrological structure and composition in the four structural units have been established. The results imply that the regional crust, which proposed to be granodioritic to quartz--dioritic in composition, is poorly differentiated. It is possible that mafic underplating at the base of the crust might have occourred, but the dilamination has indeed played an important role in the past time in the Qinling Orogenic Belt.