Timing of the formation of the Changba–Lijiagou Pb–Zn ore deposit, Gansu Province, China: Evidence from Rb–Sr isotopic dating of sulfides

The giant Changba–Lijiagou Pb–Zn deposit is located in the north of the Xihe–Chengxian (abbreviated as “Xicheng”) ore cluster in Gansu Province, China. The orebodies in the deposit are mainly hosted in the marble, dolomitic marble, and biotite–calcite–quartz schist of the Middle Devonian Anjiacha Formation. The genesis of the deposit has previously been argued to be of SEDEX type (sedimentary exhalative type) or of epigenetic hydrothermal type....