The Gangdise island-arc granite zone along the Yarlung Zangbo Grand Canyon, Xizang

The Gangdise island-arc granite zone along the Yarlung Zangbo Grand Canyon, Xizang may be subdivided into several subzones, generally representing tw ophases of magmatism and orogeny in this region. The Him alayan orogeny resulted in the widespread occurrence of the Miocene granitic batholiths nearer to the Yarlung Zangbo suture zone. The Early Jurassic and Late Cretaceous granites in the northern part of the study area should be relevant, in terms of the spatial distribution, timing of magmatic activity and genetic types of the granites, to the Nujiang Ocean closure and orogeny which may represent a long period of tectonism and magm atism during the Mesozoic.