The magma of melted detaching and sinking crystal completely mixes with that of the melted crust in the magmatic chamber of crust, which forms the Palaeogene syncollision and volcanic arc magma.

• 堆晶体发生部分熔融,拆沉物熔融岩浆与地壳熔融岩浆于地壳岩浆房产生完全混合作用,形成古近纪具同碰撞及弧火山属性的岩浆。