Discovery of gallium deposit at the bottom of Xuanwei Formation of Upper Permian in Muchuan area, southern Sichuan

• WEN Jun, 
• ZHU Helin, 
• ZHANG Hangfei, 
• ZHANG Jinyuan, 
• GUO Wenyan, 
• YOU Xuejun, 
• ZHAO Wei, 
• CHEN Dongfang, 
• ZHONG Hairen