Age of the Shahewan rapakivi granite in the Qinling Orogen, China, and itsconstraints on the end time of the main orogenic stage of this orogen

The Qinling Mountains in central China are a joint orogenic zone between th e Sino-Korean (or North China) and the Yangtze (or South China) craton bloc ks, the two major tectonic units of eastern Asia. On the end time of the ma in orogenic stage in this orogenic belt there are different opinions. The A r-40/Ar-39 Rb-Sr and zircon U-Pb ages of a recently discovered rapakivi gra nite in the Qinling Orogenic Belt are reported and the end time of the main orogenic stage for subduction-collision in this belt is discussed.