Caijiaying Pb-Zn-Ag deposit, Zhangbei Co., Zhangjiakou Prefecture, Hebei Province, China

Polymetallic Pb-Zn-Cu-(Ag-Au) vein and stockwork deposit, consisting of swarms of dense veins that range from 300 to 1000 m long, 1 to 18 m thick, and extend 400 to 500 m downdip. Host rock is a fine-grained amphibole gneiss derived from Paleoproterozoic volcanic and sedimentary rocks that are metamorphosed to amphibolite facies. They occur along a limb of an overturned fault. The deposit is related to Jurassic and Cretaceous granite porphyries and quartz porphyry dikes, and Late Jurassic volcanic rocks. It rerpresents a Mesozoic magmatic hydrothermal system. The ore minerals occur in masses and disseminations. The host rocks exhibit chlorite, sericite, silica, pyrite, and carbonate alterations. Early chlorite alteration was replaced by later sericite alteration. From the deposit outwards, the host rocks display successive belts of sericite and chlorite alteration. Fluid inclusion temperatures range from 200°C to 350°C.

Ref.:
- Dianhao, H., and Chengyu, W. (1997): Geological and geochemical characteristics and ore-forming mechanism of the Caijiaying Pb-Zn-Ag deposit, Hebei Province, China. Dixue Yanjiu 29(30), 198-211.
- Youli Feng, Lijing Yu, and Ruizhong Hu (2006): The characteristics of geological and altered rocks of Caijiaying Pb-Zn-Ag ore deposit. Journal of The Virtual Explorer 24(2).
- Zhaoshan Chang, White, N.C., Crowe, R.W.A., and Woodhouse, W. (2006): Caijiaying Mine, Hebei, China: An unusual Zn-Au deposit. Australian Earth Sciences Convention, Melbourne, July 2-6, 2006.
- Zhaoshan Chang, White, N.C., Crowe, R.W.A., Woodhouse, W., and Wilson, N. (2007): Unusual Zn-Au Mineralization at the Caijiaying Mine, Hebei, China. Symposium on Circum-Pacific Tectonics, Geologic Evolution, and Ore Deposits, Tucson (AZ), September 24-30, 2007.