Volcanic rocks of Tamulangou-Jixiangfeng cycle in Late Jurassic are alkaline-subalkaline series, and they derived from upper-mantle and were contaminated by continental crust materials.

• 晚侏罗世塔木兰沟-吉祥峰旋回火山岩为碱性系列-亚碱性系列，岩浆来源于上地幔并有陆壳物质的混染；