GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL IMPLICATION OF THE ORE-FORMING ROCKS OF THE CHANGANPU Mo (-Cu) DEPOSIT IN JILIN PROVINCE

To ascertain the metallogenic characteristics and regularity of the typical porphyry deposits in central Jilin Province, this paper studies the geological characteristics and ore-forming intrusive rocks of the Changanpu Cu-Mo deposit. The geochemical compositions of the metallogenic biotite monzogranite show the characteristics of high silicon, potassium and Al₂O₃, low total alkali, TiO₂, Y and Yb contents, with relative enrichment in LILE and LREE, depletion in HFSE and HREE, negative Eu anomaly and high (La/Yb)_N value. Two unaltered samples of biotite monzogranite show relatively low (Rb/La)_N values. The characteristics of the rock bodies are similar to those of the island arc calc-alkaline igneous rocks in Northeast China.