摘要
钡是岩石圈上部最丰富的微量元素之一,与镁、钙、锶同属碱土金属族元素,它们的化学性质比较接近,但在不同的岩石中它们的含量却有显著区别,所以不同类型岩溶水Ba2+含量有较大差别。对桂林地区不同类型岩溶水Ba2+含量分析,可以发现如下一些特点:桂林地区各种岩溶水中的Ba2+浓度普遍不高,其浓度介于4.08×10-6～28.12×10-6g/l之间。Ba2+浓度随着Sr2+和Ca2+浓度增大而减小,随着Mg2+浓度增大而增大。不同岩层地下水的Ba2+浓度有明显差别,灰岩表层岩溶带水中Ba2+浓度明显低于白云岩表层岩溶带水中的Ba2+浓度;三条地下河中,毛村地下河的Ba2+浓度最高,其次为浪石地下河,最后是丫吉地下河。可见,钡在河水中的含量与其补给径流区的岩石组分有关,是较好的天然示踪剂。
As one of the richest elements in the upper lithosphere, barium is similar to other alkaline-earth metals as Mg, Ca, Sr. But the content of barium is quite different in different kind of rocks, leading to obvious difference in the concentration of Ba^(2+). The following features are discovered through analysis on the Ba^(2+) concentration in different types of karst water in Guilin: (1) The concentration of Ba^(2+), low in all types of karst water in Guilin, ranges from 4.08×10^(-6) to 28.12×10^(-6)g/l. The concentration of Ba^(2+) decreases with the increase in Sr^(2+) and Ca^(2+) concentration, but increases with the increase in Mg^(2+) concentration. (2) There is obvious difference in the concentration of Ba^(2+) in groundwater from different strata. The Ba^(2+) concentration of epi-karst water from limestone is obviously lower than that from dolomite. Among the three underground rivers, the Maocun underground river has the highest Ba^(2+) concentration, the Langshi underground river the second and the Yaji underground river the lowest. Because the barium concentration in rivers is relevant to the component of rocks in the runoff and recharge areas, so it can reflect the information of the karst water's formation and is a better natural tracer.
出处
《中国岩溶》
CAS
CSCD
2004年第4期317-321,共5页
Carsologica Sinica
基金
国家自然科学基金资助项目(90202006)
