山西大同桑干河流域富锶土壤地球化学特征及资源潜力评价

对山西大同桑干河流域富锶土壤的研究表明, 其表层土壤锶元素含量为108.7×10-6~413.9×10-6, 平均值为261.7×10-6, 是中国土壤A层的1.57倍. 深层土壤锶元素含量为106.2×10-6~467.0×10-6, 平均值279.2×10-6, 是中国土壤C层的1.65倍. 区内表、深层土壤富锶是围岩在地下水的作用下, 锶在水中溶解, 随之迁移并在盆地富集的结果. 区内前寒武纪变质岩中锶的含量最高达1 259×10-6, 是锶的主要物质来源. 表、深层土壤中锶与Ba、B、Cr、La、Nb、Na、As、Sb、Si等关系密切. 盐碱土是主要的储锶土壤类型. 耕地中锶含量高于其他土地利用类型. 通过富锶土壤资源潜力评价, 圈出富锶土壤面积1 104 km2, 占调查区面积的69.87%, 其中适宜开发区面积442 km2. 区内具有较好的富锶优质土地资源开发潜力.

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.