The structural-alteration zoning and mineralization of Dayingezhuang gold deposit, Jiaodong peninsula

As a large gold deposit in the northwest of Jiaodong peninsula, Dayingezhuang gold deposit is an altered rock-control gold deposit in fracture zone.The zoning of structural alteration of this deposit is important to the deep peripheral prospecting of deposits in the northwest of Jiaodong.This study presents the zoning of structural-alteration, the petrogenesis, geochemistry, and calculation of tectonic stress, to reveal the structural geochemistry and structural physicochemical process of structural alteration of the Dayingezhuang gold deposit.From the distal ore surrounding rock to the ore body: ①the zonation pattern of structural alteration is weakly potassic alteration granitic rock → strongly potassic alteration granitic rock → phyllic and potassic alteration granitic rock → beresite; ②The paleotectonic differential stress have an increase trend; ③Si, Na, Ba and Srwaslost, K, Fe, Cu, Zn and Pb was externally supplied, and Au increased steadily in the whole mineralized process.The content of elements has a slight varies from unaltered rock to weakly potassic alteration granitic rock, with large amplitudes of variations from strongly potassic alteration granitic rock to beresite.During the mineralization process, the tectonic stress field and the migration of chemical compositions from rocks often display coupling behavior, as fracture and extensive space are often well developed within the rocks during the sericitization due to the relatively large paleotectonic differential stress, and this process is combined with the large variation in its compositions associated with intensive hydrothermal activity; all these factors together facilitate mineralization.