Abstract:Yinan gold deposit is located in the west of TangwuGegou fault in Yishu fault zone. It is a typical skarn type gold deposit in western Shandong province. The ore composition mainly includes natural gold, pyrite, chalcopyrite, garnet, calcite, quartz and so on. The ore structure mainly includes hypidiomorphicheteromorphic granular structure, heteromorphic interstitial structure, crushing structure. The ore structure types include disseminated structure, vein structure and massive structure. The ore lithology mainly includes pyritized diorite porphyrite, pyritized hornblende, pyritized magnetized skarn, pyritized marble, some quartz vein type ore and pyrrhotite type ore. The metallogenic stages are divided into skarn stage, hydrothermal stage and supergene stage. In this paper, eight trace elements of Au, Ag, Cu, Pb, Zn, as, Sb, Bi in ore were analyzed by spectral analysis. By using electron probe microanalysis of the thin section of the ore, the characteristics of the ore element geochemistry have been summarized. It is showed that the four elements, such as Au, Cu, Ag, Sb in the spectrum show good clustering characteristics and have a good indication for ore prospecting. EPMA data analysis shows that the ratio of CO to Ni is greater than 1, and the content of As element is relatively low. The deposit is characterized by the superposition of magmatic hydrothermal mineralization and metamorphic hydrothermal mineralization.
