Zircon U–Pb ages of Paleoproterozoic granite (1.85 Ga) and diabase (1.74 Ga) in the southwestern margin of the Yangtze Block

• ZHANG Honghui, 
• WU Liang, 
• YUAN Yongsheng, 
• LI Suoming, 
• LI Jinwang, 
• ZHANG Yaotang, 
• WANG Wanneng, 
• LI Zhiwei, 
• CHEN Guiren, 
• ZHAO Jianbo, 
• ZHENG Hongfu