赣南地区地下水氟含量区域分布特征及成因分析

Regional distribution characteristics and genesis analysis of fluorine content in groundwater in South Jiangxi

以江西赣南地区某地区为研究对象,对地下水中的氟分布含量特征及成因进行了调查分析。结果表明:不同岩类孔隙水中的地下水氟含量主要以低氟水为主,这与研究区地下水呈酸性、低矿化度、低钙离子和碳酸氢根离子等特征有关;松散岩类孔隙水中的低氟水、中氟水以及高氟水占比分别为94.3%、4.6和1.1%;碎屑岩类孔隙裂隙水中各含量分级占比分比为97.7%、0%和2.3%;花岗岩类裂隙水中各含量分级占比分比为93.2%、4.1%和2.7%;变质岩类裂隙水中各含量分级占比分比为96.4%、3.6%和0%。不同地层地下水氟含量大小依次为花岗岩类孔隙水>松散岩类孔隙水>碎屑岩类孔隙水>变质岩类孔隙水。研究区的水氟主要来源于氟矿物的溶解,同时受水动力、水化学以及地层岩性等的影响,不同地区的水氟含量有所差异。

Taking a certain area in the south of Jiangxi Province as the research object,the distribution of fluorine content in groundwater and genesis are investigated and analyzed.The result shows that the fluorine content of groundwater in pore water of different rocks is mainly low fluorine water,which is related to the groundwater characteristics of acidity,low mineralization,low calcium ion and bicarbonate ion in the study area.The percentages of low fluorine water,medium fluorine water and high fluorine water in pore water of loose rocks are 94.3%,4.6% and 1.1%respectively.The percentages of various contents in clastic rock pore fissure water are 97.7%,0% and 2.3% respectively.The percentages of various contents in granite fissure water are 93.2%,4.1% and 2.7% respectively.The percentages of various contents in metamorphic rock fissure water are 96.4%,3.6% and 0%respectively.The average fluorine content of groundwater in different water bearing rocks is granite pore water>loose rock pore water>clastic rock pore water>metamorphic rock pore water.The water fluorine in the study area mainly comes from the dissolution of fluorine minerals,at the same time,affected by hydrodynamic,hydrochemistry and stratium lithology.The water fluorine content is different in different areas.