Identification of the island-arc magmatic zone in the Lianghe-Raofeng-Wuliba area, south Qinling

摘要

Detailed studies indicate that a typical island-arc magmatic zone exists in the Lianghe- Raofeng-Wuliba area of south Qinling. This is characterized by continental marginal andesite and Bimodal volcanic rock association which was formed in a rift environment within an oceanic island- Arc. The island-arc magmatic zone is the product of Devonian-Carboniferous oceanic crust sub- Duction and rifting of Mianlue ancient oceanic basin.