Abstract:Since Jiaojia metallogenic belt was found, it has been highly concerned. In recent years，accompanying with the increased investment on geological exploration，there is a prospecting breakthrough in the deep area of the metallogenic belt (below -1000m)，and now there are more than one thousand tons of proved gold resources. The controlled depth is in excess of -2000m. Jiaojia metallogenic belt is a hydrothermal type gold deposit with obvious alteration zoning. Usually, the ore bodies are divided into groups according to the characteristics of the alteration zoning. The ore bodies in beresitization granite alteration belt in the outermost layer in the lower part of the alteration belt are divided into No.Ⅲ ore body group. The alteration of beresitization granite belt is relatively weaker and its mineralization is present as net veined, fine veined, veined and crumby. Characteristics and genesis of the ore bodies in the depth of -1000m have been summarized and analyzed, but there are few researches on the deep areas of No.Ⅲ ore body group. In this paper, the prospecting data of the deposits in the middle part of Jiaojia metallogenic belt have been collected. occurrence forms and mineralization types of No.Ⅲ ore body group in the shallow, middle and deep part of Jiaojia metallogenic belt have been compared and studied, and the genesis of the deposits have been analyzed. According to macroscopic and microscopic characteristics and the test results, combining with structure factors in the area, the genesis and the enrichment regularity of the ore bodies have been analyzed and summarized, and the occurrence of No.Ⅲ ore body group in the deep area has been conducted, the enrichment regularity and the mineralization concentration period of No.Ⅲ ore body group have been pointed out.
