REE Geochemical Characteristics of Volcanic Rocks in Zhejiang and Jiangxi Provinces and Their Geological Significance

Based on the data of 64 samples, the REE geochemical characteristics of volcanic rocks in northernZhejiang and eastern Jiangxi provinces are discussed in this paper. The REE distribution patterns in acidand intermediate-acid volcanic rocks in these areas display some similarities, as indicated byrightward-inclined V-shaped curves with negative Eu anomalies, which are parallel to each other. In addi-tion, their REE parameters （∑REE, ∑LREE/ ∑HREE, δEu ,Ce/ Yb, La/ Sm, La/ Yb,etc. ） also va-ry over a narrow range with small deviations. HREE are particularly concentrated in the volcanic rocks as-sociated with uranium mineralization. The initial;Sr/;sub>86Sr ratio in the volcanic rocks is about0.7056-0.7139. All these features in conjunction with strontium isotopic data indicate that the rock-formingmaterials come from the sialic crust. The REE distribution patterns and REE geochemical parameters of thevolcanic rocks, as well asLa/Sm-La and Ce/ Yb-Eu/ Yb diagrams may be applied to the sources ofrock-forming and ore-forming materials.