论文部分内容阅读
通过对重庆市芙蓉洞内两处滴水和两处池水长期定点观测,现场测试pH、温度和HCO3-浓度等指标,并采集适量水样带回实验室利用ICP—OES和离子色谱仪测试主要离子的浓度,计算CO2分压(PCO2)和方解石饱和指数(SIc),探讨了芙蓉洞内次生碳酸盐的沉积情况及与当地降水的关系。结果显示:四个观测点洞穴水在大部分时间相对于方解石为过饱和水,且正在沉积碳酸盐,可见芙蓉洞地区大部分时间具有洞穴碳酸盐沉积的温度和降水条件;不饱和出现在较大降水量之后的1～2个月内,是降水对岩溶水的稀释作用导致的。因此,降水量的变化是洞穴水呈现过饱和与不饱和交替的出现主要原因,最终导致碳酸盐沉积的季节变化,降水量过大时不利于碳酸盐的沉积。
Through the long-time fixed point observation of two drips and two ponds in Furong Cave in Chongqing, the pH, temperature and HCO3-concentration were measured in the field, and the appropriate amount of water was taken back to the laboratory to test the main ions using ICP-OES and ion chromatography The partial pressure of CO2 (PCO2) and the saturation index of calcite (SIc) were calculated. The sedimentation of secondary carbonate in Furong Cave and the relationship with the local precipitation were discussed. The results show that most of the water in the four observation sites is supersaturated with calcite and carbonates are being deposited. Therefore, most of the time in Furongdong has the temperature and precipitation conditions for cave carbonate deposition. Unsaturated Within 1 ~ 2 months after the larger precipitation, it is caused by the diluting effect of precipitation on karst water. Therefore, the change of precipitation is the main reason that the cave water appears the supersaturation and unsaturated alternation, which eventually leads to the seasonal change of carbonate deposition. When the precipitation is too large, it is not conducive to the deposition of carbonate.