摘要
通过对奎屯河流域包气带土壤和地下潜水取样分析,发现从山前洪积砾质倾斜平原到冲洪积平原,氟质量浓度的迁移分布明显具有淋溶-径流、径流-淋溶蒸发、溶滤-强烈蒸发浓缩3个水文地球化学分带。氟质量浓度在细粒粘土粉土层中相对较高,而在砂层中相对较低,无论属于哪种岩性结构在地下潜水位附近氟含量都相对较高。该流域内3条河流氟质量浓度均为上游低下游高,且在流域上游增幅相对较小而在下游增幅相对较大。环河道由近河岸到远河岸水土中氟质量浓度也逐渐增加。初步分析认为,该内陆平原地区氟的富集是以蒸发浓缩作用为主。运用热力学理论进行了验证,水土中氟的水平分布规律是一致的,并可相互转化。
Through analyzing the fluorine contents in the shallow groundwater in unsaturated soils of Kuitun river basin, the following conclusions are drawn： （a） From the deluvial gravel plain in front of the mountains to the aggraded flood plain, the migration and distribution of the Fluorine behaves three geochemical zones, i, e, , leachdrain, drain-leach evaporating, lixiviation-violent evaporating concentration; （b） Content of fluorine is relatively high in the fine clay soil and silt layer, but relatively low in the sand layer; and relatively high near the groundwater level in the soils no matter unsaturated soils belong to what kinds of rock structure; （c） Content of fluorine of the three rivers in the river basin is lower in upper stream than in down stream, and the magnitude of increase of fluorine content is relatively small in the upper stream but relatively big in the down stream, the along river lane, fluorine content in water and soil increases gradually from near river shore to off-shore. It is thought that the concentration of fluorine in the region is dominated by evaporating. Thermodynamic theory verification indicates that the distribution regularity of fluorine in water and soil are same and may interchange.
出处
《地球科学与环境学报》
CAS
2006年第4期64-68,共5页
Journal of Earth Sciences and Environment
基金
中国地质调查局专项基础项目(2003100400012)
关键词
奎屯河流域
氟
分布规律
形成因素
新疆
Kuitun river basin
fluorine
regularity of distribution, formative factors, Xinjiang
