拱王山风化壳的发育特征及其环境和构造意义

风化壳的化学、粘粒矿物及磁化率等实验分析表明 ,云南东川拱王山地区碳酸盐岩风化壳的红土化程度较低 ,处于Ca、Mg淋失阶段的后期或SiO2 淋失、Fe、Mn富积的早期。该地区风化壳在不同程度上存在与现代环境的不相容性。它们是在古风化壳基础上发育的继承性风化壳。在不同海拔高度的山前剥蚀面上 ,风化壳红土化程度的差异 ,是不同时期风化作用的产物。除山顶残留古夷平面上的风化壳之外 ,随海拔高度的增加 ,风化壳的风化程度存在逐渐增强的趋势 ,这一现象反映了该区新构造运动的间歇性抬升特征。

The Weathering Profiles and Its Environmental and Tectonic Significance in the Gongwangshan Mountain,Yunnan Province

In the Gongwangshan Mountain of Yunnan Province,the features of chemistry,clay minerals and susceptibility etc. about weathering profiles of carbonatite had been researched. The results indicated that the laterization degree of weathering profiles is lower. They belong to the latter phase of Ca?Mg eluviation or the early phase of SiO2 loss and Fe?Mn richer. In varying degrees,the weathering profiles are not consistent with environment today. They developed successively on the palaeo-weathering crusts. On the denudation surfaces with varying elevation,the difference among weathering profiles is result of different laterization processes. Except for the weathering profile on the relict paleo-plantation surface of mountain summit,the laterization degree of weathering profiles showed the increasing trend along with the elevation increasing. This phenomenon indicated that the neotectonics of research region is intermittent uplift.