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An Analysis on Formation of the Karst Fengcong Depressions in China

机译：中国喀斯特凤岗洼地形成分析

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摘要

The karst fengcong depressions in China, known as the most typical symbole of karst landforms in the world , are distributed in the humid and hot karst areas north to the Qinling Mountain. The geomorphological structure is characterized by very orderly polygon networks on a plane which consist of steep peaks and deep dolines. Hard and horizontal old strata, thick and pure massive limestones, upland and deficient autogenic water are the basic conditions for the development of the fengcong depressions . The monsoon climate results in the evident differential solution processes in different geomorephologic positions-i.e,there is the highest solution rate on the bottom of depression, the second highest in the saddle between peaks.the third highest on the top of peaks and the lowest on the slope of peaks. The evident differential solution can rapidly form the relief of landforms. Therefore, the climate is the key factor responsible for the marvelous landforms.ln addition, the paleoenviromental history played an important role in their formation. Generally, the development of the fengcong depressions has gone through three important processes,epikarstification, concentrated solution and differential solution.
机译：中国的喀斯特凤岗凹陷，被称为世界上最典型的喀斯特地貌撒上的歌剧，分布在北陵山上的潮湿和热的喀斯特地区。地貌结构的特点是在平面上具有非常有序的多边形网络，其由陡峭的峰和深含量组成。艰难和横向旧地层，厚度和纯净的大型石灰岩，高地和缺乏的动力水是凤岗凹陷的发展的基本条件。季风气候导致不同地理位理位置的明显差异溶液过程 - 即，抑郁症底部存在最高的溶液率，峰之间的马鞍中的第二高。峰顶的第三高，最低山峰的斜率。明显的差动解决方案可以迅速形成地貌的浮雕。因此，气候是负责奇妙地地实事的关键因素。此外，古生病史在其形成中发挥了重要作用。一般来说，凤岗凹陷的发展经历了三个重要的过程，锥形化，浓缩溶液和差动溶液。

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