兴文侵蚀型天坑的形成演化过程研究

Research on Formational and Evolutional Processes of Xingwen's Erosive Karst Tiankeng

通过对兴文世界地质公园的实地考察研究,发现兴文喀斯特天坑除了大小岩湾等塌陷型天坑外,在僰王山景区内还有飞雾洞、道洞、沧水岩峡谷、楠星天坑等喀斯特地貌。它们可以作为兴文地质公园内喀斯特侵蚀型天坑的形成遗迹,它们分别代表了兴文喀斯特侵蚀型天坑的侵蚀演化过程,即竖井状落水洞阶段逐步溶蚀、侵蚀到天坑形成,到最后退化成大型峡谷或者大型漏斗。这些特殊的侵蚀型喀斯特地形的形成除了以流水侵蚀作用为主外,同时塌陷也起着十分重要的作用。

According to the first-hand investigation and study on Xingwen Global Geopark,the results and the data show that apart from Dayanwan and Xiaoyanwan collapsed karst Tiankeng,there are other karst landforms in Bowang Mount scenic spot such us Feiwu Cave,Dao Cave,Cangshuiyan Gorge,Nanxing TanKeng and so on.These typical karst landforms could be regarded as different vestiges of erosive karst Tiankeng of Xingwen Global Geopark,which stand for the evolutional processes of erosive karst Tiankeng separately.Moreover,the evolutional processes of erosive karst Tiankeng could be divided into the following continuous processes:an erosive karst Tiankeng develops from the processes of eroding and dissolving & extending of silo Sinkhole,and subsequently degrades to a large gorge or doline.It is worth pointing out that except for erosion of flowing water,at the same time,collapse's effect has been playing extremely important role in the forming processes of these special erosive landforms.