摘要:
为掌握新田县地下水锶富集环境及来源,对新田县富锶地下水及对相应地质剖面岩样进行采样分析.结果表明,富锶地下水赋存于泥盆系佘田桥组地层中,地下水锶元素含量具有泥盆系佘田桥组(D3 s)>石炭系岩关阶(C1 y)>泥盆系锡矿山组下段(D3 x 1)>泥盆系棋子桥组(D2 q)的规律;下降泉、机井中锶元素含量平均值分别为376.57μg·L-1、2756.87μg·L-1,分别是饮用天然矿泉水锶含量最低限值的1.88倍、13.78倍,机井锶元素平均含量远高于下降泉,是其7.32倍;佘田桥组地层岩性为中薄层浅灰色泥灰岩夹灰岩、页岩,岩石中锶含量普遍大于300 mg·kg-1,最高含量为838 mg·kg-1,是地下水中锶元素主要来源.地层平缓的产状、低的降水入渗系数、面状补给、分散渗流为富锶地下水的形成提供了水文地质基础.
Abstract:
This work attempts to better understanding the enrichment environment and sources of strontium in groundwater in Xintian county,Hunan Province.Groundwater and rocks on geological profiles were sam-pled and analyzed.The results showed that,(1)Rich-strontium groundwater is present in the strata of D3 s , with contents in order for strata,D3 s >C1 y >D3 x 1 >D2 q ;(2)The average contents of strontium element of springs and shafts are 376.57μg·L-1 and 2,756.87 μg·L-1 ,respectively,1.88 times and 13.78 times the natural mineral water,respectively.Strontium element contents of shafts are much higher than that of de-scending springs,7.32 times the descending spring;(3)The lithology of D3 s is medium-thick or thin layers of light grey marls,intercalated with limestone and shale,in which strontium contents are generally more than 300 mg · kg-1 ,with the highest was 838 mg · kg-1 ,which is the primary source of strontium in groundwater;(4)Many conditions have contributed to the formation of rich strontium in groundwater,such as gentle strata,the low coefficient of precipitation infiltration,planar supplies,and scattered seepage.
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