A large area of multi- stage magmatic rocks constitute a huge magmatic belt in the Eastern Kunlun. A summary of the recently obtained zircon U- Pb or39Ar-40Ar ages of Indo- Chinese epoch intermediate- acidic magmatic rocks in Eastern Kunlun indicates that two stages of magmatism, including early stage(260- 230Ma) and later stage(230- 195Ma).The main components of the early stage are tonalite, granodiorite and adamellite. Rocks from the late stage are composed mainly of syenogranite and adamellite. The wide distribution of the intermediate- acidic magmatic rocks indicates a very complex tectonomagmatic history of the Eastern Kunlun during the Indo- Chinese epoch. The early stage rocks are probably related to massive subduction of oceanic crust collide in the Eastern Kunlun. The formation of later stage rocks might have resulted from post- collisional/post- orogenic lithospheric extension after collision.
intermediate-acidic magmatic rock