GEOCHEMISTRY AND RESOURCE POTENTIAL EVALUATION OF STRONTIUM-RICH SOIL IN SANGGAN RIVER BASIN OF DATONG, SHANXI PROVINCE

The study on the Sr-rich soil in Sanggan River basin of Datong, Shanxi Province, shows that the Sr content in surface soil is 108.7×10^-6-413.9×10^-6, averagely 261.7×10^-6, 1.57 times that of the Chinese soil layer A, while the Sr content in deep soil is 106.2×10^-6-467.0×10^-6, averagely 279.2×10^-6, 1.65 times that of the Chinese soil layer C. The enrichment of Sr in surface and deep soils is the result of dissolution of Sr in the surrounding rock by the process of groundwater, followed by migration and then enrichment in the basin. The Precambrian metamorphic rocks, in which the maximum Sr content is up to 1 259×10^-6, serve as the main material source of Sr. In surface and deep soils, Sr is closely related to the elements of Ba, B, Cr, La, Nb, Na, As, Sb and Si. Saline-alkali soil is the main type for Sr storage. Sr content in cultivated land is higher than that in other land use types. According to the evaluation of Sr-rich soil resource potential, the area of strontium-rich soil is 1 104 km², accounting for 69.87% of the study area, among which the area suitable for development is 442 km². It is concluded that the study area has good development potential of high-quality Sr-rich land resources.