The ∑REE, Ce, Zr contents are high, and the content of Ga can reach over 25×10~(-6), far higher than that of other granite types. Its Eu ((0.75)×10~(-6)-4.3×10~(-6)) is depleted slightly, belonging to LREE enrichment type.
The REE of silicified breccia is characterized by the ratio of LREE/HREE being 1 95～4 93, both Ce( δ Ce=0 44～0 81) and Eu ( δ Eu=0 58～0 89) being weakly negative anomaly. All of the REE patterns are LREE enrichment type. With the increasing silicification of the breccia, the total REE contents of breccia rocks decrease obviously.
REE researchingfinds that carbonate rocks of Cambrian-Ordovician in Tazhong area are belong toLREE enrichment type, δEu and δCe appear obviously negative anomaly, whichreflect that the diagenetic environment is anoxic condition.
The ortho metamorphogenetic type deposit’s invariable elements are close to calc alkalic alkalic and basic magmatites,the TiO 2 is correlated with SiO 2 in negative correlation,the distribution pattern of the REE is from LREE enrichment type to LREE depletion type.
It was derived from the source of an enriched mantle. The volcanic-plutonicassociations of island-arc type are predominated by the calc-alkaine andtholeiite series. They are of LREE enriched type, and δEu ranges from0.53 to 0.79. They are mainly the products in the orogenic stage ofsubducting type.
Studies on chemical composition and trace elements and REE geochemistryof mantle peridotite in opholites of Shexian County show that its chondrite-normalized patterns are of LREE--enriched type, quite different from mantleperidotite from other orogenic belts of China.
Various sedimentary rocks and most Cu ore, Cu mineral belong to the LREE concentration type, the gangue mineral of Cu ore snd calc-sinter mainly belong to the MREE concentration type,whereas basalt and rare Cu ore belong to the LREE weak concentration type.
Affter exposure of the Au-bearing Pb-Zn sulfides, Pb-Zn sulfides would be converted to sulfates under the action of meteoric water. The residual Au was enriched to form the supergene enrichment-type gold deposits.