Geochemical environmental characteristics of China's seven ancient capitals

Abstract：According to data from geochemical stream sediment survey, this paper deals with the environmental geochemical background characteristics of China's seven ancient capitals, which include Anyang, Xi'an, Luoyang, Kaifeng, Nanjing, Hangzhou and Beijing. The results show that, compared with element contents of stream sediments in China, the body-oriented essential nutrients cal