Study of late-Mesozoic magmatic rocks and their related copper-gold-polymetallic deposits in the Guichi ore-cluster district, Lower Yangtze River Metallogenic Belt, East China by Gu, Huangling, Yang, Xiaoyong, Nie, Zhangxing, Deng, Jianghong, Duan, Liuan, Hu, Qing, Abdul Shakoor, Mastoi, Gao, Ergen, Abdul Aziz, Jasmi Hafiz