In Yutangba selenium deposit, the REE content of siliceous rocks is Iow(38.9x10-6), and enriched in LREE. In Ziyang selenium-rich area, it is from (12.0-37.6)x10-6, In both of two areas, there exist Ce negative anomaly and Eu positive anomaly.

• 渔塘坝硒矿区硅质岩的REE总量较低，平均为38.；9×10~(-6)，紫阳硒富集区硅质岩REE总量除个别较高(达110×10~(-6)以上)外，总体也较低(12