YanJing Chen is a professor at the Peking University (Beijing). He got B.Sc. (1984), M.Sc. (1987) and Ph.D. (1990) from Nanjing University (China). Research fields include economic geology, fluid inclusion, geochemistry, Precambrian geology, ore exploration, continental collision orogeny, and the 2300-Ma environment catastrophe and its associated mineralization explosion event. He has published over 200 research papers and several books such as “Gold Mineralization in Western Henan” (Chinese Seismological Press, 1992, in Chinese).