ABSTRACT
The distribution of selenium (Se) in the topical environment is extremely variable with large regional differences. To investigate the distribution and variation patterns of Se in geological periods and their relationships with the regional differentiation of Se in the surface environment, concentrations of Se were analyzed in about 3000 samples including bedrock, soil, rice, corn, and from stratum sections with different geological periods and topical environments in the stratum distribution area in different tectonic units of China. The enrichment and lack of Se is nearly the same in the same lithology and marine sediment of the same geological period and in the same tectonic units, but Se content varies greatly in the same lithology and terrestrial deposits. The lowest Se stratigraphic horizon and low Se distribution areas are mainly associated with Precambrian Archean and Proterozoic granitic gneiss strata and are related to the granite rock mass in different geological periods and distribution areas.
