摘要
本文运用岩溶动力学理论和方法对玄武岩和第三系盖层下石林的岩溶动力学特征进行了对比研究。结果表明 ,玄武岩盖层下空气的CO2 浓度具有双向变化梯度与明显的季节变化 ,而第三系盖层下随深度递减且季节变化不显著 ;玄武岩水在雨季和旱季对碳酸盐岩都具有侵蚀性 ,而第三系水在旱季已饱和 ;玄武岩裂隙最大渗透张量比第三系大 ,而最大主轴倾角则比第三系小 ;玄武岩盖层下石灰岩的百日溶蚀量是第三系的 14～ 2 2倍。上述特征说明玄武岩盖层下的石林发育好 。
Using karst dynamics theory and methods, the authors made a comparative investigation on karst dynamics features of Stone Forests under basaltic and Tertiary covers in Shilin area, Yunnan Province. The results demonstrate that CO 2 concentration in air under the basaltic cover shows obvious seasonal variation and a two way variation gradient, while in air under the Tertiary cover, the concentration decreases with depth without obvious seasonal variations. The water in the basalt is erosive to carbonate in rainy and dry seasons, whereas the water in the Tertiary cover is saturated in dry season. The biggest fissure permeability tensor of the basalt is larger than that of the Tertiary, while the largest dip angle of the main axis of the basaltic fracture is smaller. The solution amount of limestone per one hundred days in the basaltic cover is 14～22 times that in the Tertiary cover. All these characteristics suggest the frequent development of Stone Forests under the basaltic cover and account for the frequent spatial association of Stone Forests with basalts.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2004年第1期59-62,共4页
Acta Geoscientica Sinica
基金
石林研究基金"路南石林非可溶岩盖层下的岩溶动力学研究"
国土资源部岩溶动力学开放研究实验室资助
关键词
岩溶动力学
玄武岩
第三系
盖层
basaltic cover Tertiary cover karst dynamics
