陕西南郑小南海天坑群与广西乐业大石围天坑群对比研究

通过对比分析南北典型岩溶地质遗迹大石围天坑群和小南海天坑群,加深了对汉中天坑群的认识。从自然地理背景、地质条件、地质遗迹类型与特征、天坑群发育演化模式等方面,与广西乐业大石围天坑群进行对比,陕西南郑小南海天坑群分布于湿润热带-亚热带最北端,发育于扬子地台区北缘的岩溶台原区。境内天坑、溶洞、竖井、断崖、峡谷、峰丛、洼地、地下河及化学沉积物等地质遗迹集中发育且组合丰富,形成一个由非可溶岩系、地表分水岭组成隔水边界的相对独立的岩溶系统,呈现内源水窗式天坑演化特点,具有很高的学术研究价值和景观价值。

A Comparative Study of Xiaonanhai Tiankeng in Nanzheng,Shaanxi Province and Dashiwei Tiankeng Group in Leye,Guangxi province

The typical karst geological relics of Dashiwei Tiankeng group in the South of China and Xiaonanhai Tiankeng group in the North of China are comparatively analyzed to helpfully deepen the understanding of the Tiankeng group in Hanzhong,Shaanxi province.Compared with Dashiwei Tiankeng group in Leye,Guangxi,from aspects of geographical background,geological conditions,geological relics and characteristics,evolution model,Xiaonanhai Tiankeng group in Nanzheng of Shaanxi is distributed in the most northern part of humid tropical-subtropical zone and developed in the karst platform area in the northern margin of the Yangtze platform.Geological relics such as Tiankeng,karst cave,shaft,cliff,canyon,peak cluster,depression,underground river,and chemical sediment,are intensively developed and combined,forming a relatively independent karst groundwater system with impervious boundary of non soluble rock series and surface watershed,showing the evolution characteristic of water-window-like endogenous sinkholes,having a high value in academic research and in landscape.