| Citation: | YUAN Yuelei, LIU Shengchen, LIU Xuguang, CHEN Yanfei, XU Yaqing, FAN Xiao, HUO Qinglong. 2023. The structural-alteration zoning and mineralization of Dayingezhuang gold deposit, Jiaodong peninsula. Geological Bulletin of China, 42(4): 576-588. doi: 10.12097/j.issn.1671-2552.2023.04.007 |
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.
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General geological map of Dayingezhuang gold deposit
Zoning diagram of structural-altered rock in the Dayingezhuang gold deposit
Zoning and sample location map of the Dayingezhuang gold deposit
Schematic diagram of rock strain and stress
The strain ratio of quartz
The variation diagram of differential stress values for the structural-altered zone in the Dayingezhuang gold deposit
Diagram showing the mass balance of structural-altered zone in the Dayingezhuang gold deposit
The variation diagram of trace element value for the structural-altered rocks in the Dayingezhuang gold deposit