Geological Expedition and Analysis on Formation and Evolvement of Erosive Karst Tiankeng: A Case Study of Xingwen World Geopark

Erosive Karst Tiankeng has been a new type of Tiankeng Since the Collapsed Karst Tiankeng was found and primarily research by Zhu Xuewen, a famous geologist. But, how the Erosive Karst Tiankeng evolved and developed? How can we find the proofs on formation and evolutional processes of Erosive Karst Tiankeng? Few scholar focused on this new field. According to the first-hand datum by geological Expedition and study in Xingwen World Geopark, the results and datum show that apart from Dayanwan and Xiaoyanwan collapsed karst Tiankeng, there are other karst landforms in Bowang Mount scenic spot of Xingwen World Geopark 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 World 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.