Hydrothermal Alteration Characteristics and Migration Rules of Trace Elements in the North Sanshandao Sea Gold Deposit, Shandong, China

Jiaodong area, the most important gold province in China, is an area with concentration occurrence of large and super large gold deposits, the proved reserves in Jiaodong Peninsula account for more than 30% of the country. The fracture zone altered type gold deposit is one of the important types in the area; The Sanshandao North Sea gold deposit is a typical representative of this type. This gold deposit is a super-large gold deposit newly discovered in recent years, it is important to study the eroded rock of this deposit. Based on the detailed rock core compilation and interior study, the main corrosion type and mineral combination characteristics were identified. Samples of typical eroded rock were collected and underwent trace element geochemical analysis, the element migration rules in the hydrothermal erosion are summarized by mass balance technique, and the characteristics of trace elements in beresite are also discussed. The results show that, in the elevation range-1200 to-1400 m, corrosion types are kalification, sericitization and beresitization. Among them, the most closely related to mineralization are sericitization and beresitization. From the original rock to the beresite, the fluid provides a large number of low temperature elements (migration value ＞ 2) such as As, Sb, Te, moderate medium temperature elements (migration values are 1~2) such as Pb, Zn, Cu, and a small number of high temperature elements (migration value ＜1) such as Co, Ni, and Cr. It is shown that at-20 −1200 to −1400 m, it is predicted that the ore body at −1200 to −1400 meters is still in the upper middle part, and there is still good prospecting potential in the depth.