摘要
通过对桂林地区地下河系统不同类型岩溶水水样Sr2+含量和87Sr/86Sr值分析,得到如下结论:(1)桂林地区岩溶水中Sr2+含量普遍较低,流经不同岩层的地下水Sr2+含量不同,岩溶水中Sr2+含量随着Ca2+含量的增大而增大,随着Mg2+含量的增大而减小;地下河水中的Sr2+含量始终介于表层岩溶带水、饱水带裂隙水、地表坡面流和外源水(如果存在外源水补给)的最大、最小值之间。(2)流经不同岩层地下水的87Sr/86Sr值不同,流经砂岩层地下水87Sr/86Sr值较高,其次为流经白云岩层和灰岩层的地下水;地下河水87Sr/86Sr值也是介于表层岩溶带水、饱水带裂隙水、地表坡面流和外源水(如果有外源水补给)的最大、最小值之间。因此Sr2+和87Sr/86Sr能反映岩溶水形成的信息,是较理想的天然示踪剂,在岩溶水研究中具有很广阔的应用前景。
Strontium is the richest trace element in the upper lithosphere.It is inactive to most substances in natural conditions due to its stable chemical characteristics.The Sr^(2+) concentration and^(87)Sr/^(86)Sr value have obvious differences in various conditions and settings.Through analyzing the Sr^(2+) concentration and (the^(87)Sr/^(86))Sr value in different karst water samples from the underground river systems in Guilin, the following conclusions are drawn: (1) Sr^(2+) concentration of the karst water in Guilin is low. Flowing through different kind of stratum, the underground river water has different Sr^(2+) concentration. Sr^(2+) concentration of karst water increases as Ca^(2+) concentration increases and decreases as Mg^(2+) concentration increases. Sr^(2+) concentration of the underground river water is between maximal and minimal Sr^(2+) concentrations of the epi-karst water, cranny water, upper flow water and allogenic water (if allogenic water supplies underground river). (2) Flowing through different stratum, groundwater has different^(87)Sr/^(86)Sr value. Sandstone stratum water has the highest^(87)Sr/^(86)Sr value, next is dolomite stratum water and the lowest is limestone stratum water. The^(87)Sr/^(86)Sr value of underground river water is between maximal and minimal^(87)Sr/^(86)Sr values of the epi-karst water, cranny water, upper flow water and allogenic water water (if allogenic water supplies underground river). So,Sr^(2+) and^(87)Sr/^(86)Sr can provide information on how karst water comes into being. They are ideal natural tracers and may have a wide application in karst water research.
出处
《中国岩溶》
CAS
CSCD
2004年第1期37-42,共6页
Carsologica Sinica
基金
国家自然科学基金资助项目(90202006)
