Geological and geochemical characteristics of Middle Jurassic granites in Bengbu uplift, Southeast of North China craton

Congxuan, Kang; Xianzhong, Yang; Cai, Yanyan; Zong, Wenjun; Zhu, Xiaomin

doi:10.1111/1755-6724.13197

Cited by 1 publication

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“…The majority of the Bengbu uplift is covered by the Quaternary, and the exposed metamorphic basement is mainly the Archaean Wuhe group (Ar3wh). The Wuhe group is composed of five subgroup formations: Xigudui, Zhuangzili, Fengshanli, Xiaozhangzhuang, and Yinjiajian [16]. The protolith of the Wuhe group is a series of basic-intermediate-felsic volcanic rocks, containing graywacke and iron siliciclastic carbonate rock, which are in contact with the near subhorizontal ductile shear zone.…”

Section: Regional Geologymentioning

confidence: 99%

Typomorphic Characteristics of Gold-Bearing Pyrite and Its Genetic Implications for the Fang’an Gold Deposit, the Bengbu Uplift, Eastern China

Wang

Li²,

Zhong

et al. 2022

Minerals

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The Fang’an quartz-vein gold deposit is located in the eastern part of the Bengbu uplift. The eastern part of the Bengbu uplift is considered to be the western extension of the Zhaoyuan gold mineralization zone in the Jiaodong area of Shandong Province and has huge mineralization potential. The Fang’an deposit was a newly discovered, small-sized gold deposit, and the research in the area is relatively weak. In this study, samples of quartz-vein type ore were collected from the ZK141, ZK1549, and ZK1665 drill holes of the Fang’an gold deposit. Based on the study of the geological characteristics, the major and trace elements of pyrite in different stages were analyzed by electron probe microanalyzer (EPMA), to explore the compositional characteristics of pyrite, the occurrence of gold, and the source of ore-forming fluid. The studies indicate that the deposit experienced four ore-forming stages: the quartz stage, the quartz-pyrite stage, the polymetallic sulfide stage, and the carbonate stage. The pyrites are grouped into three stages, corresponding to the first three ore-forming stages. The EPMA analyses showed that the major elements of pyrite were high Fe and low S, indicating that the formation was hydrothermal. The high content of Ni indicated that the metallogenic materials were derived from between the mantle and the lower crust. The general Co/Ni ratio of >1, with an average of 5.34, indicated that the ore-forming fluid was derived from the magmatic–hydrothermal fluid and wall rock. The Fang’an gold deposit mainly contains nano-gold.

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Section: Regional Geologymentioning

confidence: 99%