Fig.3 Chondrite-normalized REE patterns for silicalites of the Sinian (7,9), Cambrian (3,4,5,6,8) and siliceous concretion of the Ordovician (1,2) in the Southern Shaanxi

• 图3陕南震旦系(7，9)、寒武系(3，4，5，6，8)硅质岩和奥陶系(1，2)硅质结核稀土元素分布曲线