摘要
以桂林尧山为基地 ,用灰岩和白云岩试片作了外源水对灰岩和白云岩的侵蚀速率的野外观测试验 ,得出外源水对灰岩的侵蚀速率在1 0 -7mmol/ cm2·s数量级 ,或约 1 0 0 0 mm/ ka;而外源水对白云岩的侵蚀速率在 1 0 -8mmol/ cm2· s数量级 ,或约 2 0 0 mm/ ka。此外 ,还发现 ,灰岩侵蚀速率对水动力条件的变化远较白云岩敏感 ,即流速增大时 ,灰岩溶解速率增加明显 ,而白云岩溶解速率仅有少量增加 ,这可能反映出两种主要的碳酸盐岩在溶解速率控制机理上存在着差异。
Allogenic water plays an important role in the development of karst geomorphology, especially in peak forest karst. This is mainly due to its lower hardness and pH value, and thus with intensive aggressiveness to carbonate rock. The author, taking Yaoshan, Guilin as an example, made a field experimental research on the corrosion kinetics of limestone and dolomite in allogenic water by weighing the lose of limestone and dolomite tablets. The results show that the corrosion rates of limestone in allogenic water is in the order of 10 -7 mmol/cm 2·s, or about 1000 mm/ka; whereas, for dolomite, in the order of 10 -8 mmol/cm 2·s,or 200 mm/ka. In addition,it was found that the corrosion rates of limestone are much more sensitive to the change of hydrodynamics than those of dolomite, i.e., with the increase of the flow rate, the corrosion rates of the limestone are greatly increased,but those of the dolomite have a little increase, which possibly reflects that there are differences in corrosion rate determining mechanisms between the two major carbonate rocks.
出处
《中国岩溶》
CAS
CSCD
2000年第1期1-4,共4页
Carsologica Sinica
基金
国家自然科学基金!(编号 :496 32 10 0和 4970 30 47)
国土资源部资助项目!(编号 :95 0 110 4和 980 6 )
关键词
外源水
灰岩
白云岩
侵蚀速率
流速
野外试验
Allogenic water
Limestone
Dolomite
Corrosion kinetics
Flow rate
Guilin
