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近日,由中国地质调查局岩溶地质研究所组织实施的《红水河上游岩溶流域1∶5万水文地质环境地质调查》二级项目,在贵州省打帮河流域安西镇幅初步圈定富硒土壤面积约80 km2。在1∶5万水文地质环境地质调查的基础上,项目组有针对性地在打帮河流域安西镇幅选择13处土壤采样点,所有样品均采自近地表的耕作层。测试结果表明:样品中的硒含量为0.3~1.31 mg/kg,平均值0.56m g/kg,其中含量高于世界土壤中位值(0.4 m g/kg)的采样点8个,平均值达0.72 mg/kg,说明调查区存在高品质富硒土壤。调查分析发现,二叠系龙潭组地层分布区残坡积、坡洪积物中土壤硒检出值最高,其次以三叠系下统碳酸盐岩地层分布区残坡积和坡洪积层中土壤硒含量较高。据此,初步圈定富硒土壤面积约80 km2,下一步将深入开展相关工作准确圈定富硒土壤分布范围并查明其发育机理。
Recently, by the China Geological Survey Institute of karst geology, “the upper reaches of the Red River upstream karst basin 1: 50000 hydrogeological and environmental geological survey,” two projects in Guizhou Province to help the Anzhe Dangang River area preliminary delineation of selenium-rich soil The area is about 80 km2. Based on the 1: 50000 geological survey of hydrogeological environment, the project team selected 13 soil sampling points in Anxi Township, Kedong River Basin in a targeted manner. All the samples were collected from near surface tillage. The results showed that the content of selenium in the sample was 0.3-1.31 mg / kg with an average value of 0.56 mg / kg, of which 8 were higher than the median of the world soil (0.4 mg / kg), with an average value of 0.72 mg / kg, indicating that there is high-quality Se-enriched soil in the survey area. According to the survey and analysis, the selenium content of the residual sediments and slope sediments in the Permian Longtan Formation stratigraphic distribution is the highest, followed by the residual sediment and slope pluviation in the Lower Triassic Lower Carboniferous strata Soil selenium content higher. Accordingly, the initial delineation of selenium-rich soil area of about 80 km2, the next step will be carried out in-depth work to define the distribution of selenium-rich soil and identify its development mechanism.