Collapse is a common geomorphic process in karst areas,especially on the Yunnan-Guizhou Plateau,which has a tectonic background of integral uplift.The frequent occurrence of collapse processes in karst underground cav...Collapse is a common geomorphic process in karst areas,especially on the Yunnan-Guizhou Plateau,which has a tectonic background of integral uplift.The frequent occurrence of collapse processes in karst underground caves and canyons indicates that collapses play an important role in the formation of canyons.Through an analysis of the morphology of a semicircular cliff in the Huajiang Grand Canyon and an investigation of sediments at the bottom of the cliff,a large-scale collapse event was found to have occurred.U-series dating of secondary calcium carbonate cement in the collapse breccias indicates that collapse processes occurred approximately 200 ka.According to the geomorphological evolution of the Huajiang Grand Canyon,the following geomorphic evolutionary process is proposed:underground river-cave hall-collapse of a tiankeng-tiankeng degradation-canyon formation.These findings also show that the dating of collapsed breccia cement can be effectively used to determine the development times of karst canyons and the formation ages of tiankengs.展开更多
Based on researches done by other scholars,this paper summarized tiankeng's landscape characteristics and analyzed them.By referring to the methods and standards of tourism resources evaluation,tiankeng landscape ...Based on researches done by other scholars,this paper summarized tiankeng's landscape characteristics and analyzed them.By referring to the methods and standards of tourism resources evaluation,tiankeng landscape evaluation model has been built.The evaluation index system was built in terms of the model and tiankeng's characters.After the evaluating factors and index were established,the weights of them have been figured out by AHP method.For the first time tiankeng has been studied from the view of landscape.However,this primary study about tiankeng landscape evaluation will offer reference for its tourism development and protection.It also lays the foundation for the construction of a better system.展开更多
Chinese scholars Zhu xuewen put forward Tiankeng and defined it as a collapse feature which was diffe rent from the ordinary doline and developed in large-scale underground river channel.This paper analyzed the sasic ...Chinese scholars Zhu xuewen put forward Tiankeng and defined it as a collapse feature which was diffe rent from the ordinary doline and developed in large-scale underground river channel.This paper analyzed the sasic conditions of Xiaoyanwan Tiankeng formation,such as sedimentary environment,climatic and hydrological conditions and so on;and deeply discussed the development course of Xiaoyanwan Tiankeng on this basis.The research result showed that Xiaoyanwan Tiankeng was completely accord with Tiankeng' definition,and was a well-developed and especially big Tiankeng in the maturation stages.展开更多
末次冰期全球气候波动频繁,影响了哺乳动物的演化和迁移历史。汉中天坑群丰富的地质生物记录是重要的古气候、古环境研究材料,并使用石笋重建了秦巴地区末次冰期的季风演化历史。汉中天坑群考察过程中发现的东方剑齿象化石也为认识晚第...末次冰期全球气候波动频繁,影响了哺乳动物的演化和迁移历史。汉中天坑群丰富的地质生物记录是重要的古气候、古环境研究材料,并使用石笋重建了秦巴地区末次冰期的季风演化历史。汉中天坑群考察过程中发现的东方剑齿象化石也为认识晚第四纪古生物演化历史和生态环境响应提供了重要的参考资料。文章对东方剑齿象样品进行铀系(U-Th)和碳十四(14C)测年,并参考化石上结晶的碳酸钙铀系年龄,判断汉中天坑群天星岩东方剑齿象的生存时代约为27.5kyr BP(kyr=千年;BP=Before the present, present定义为1950年)附近MIS3阶段的DO暖事件。结合已有的石笋氧同位素序列和其他的古气候记录,推测MIS3时期汉中地区气候很可能比现代更温暖湿润,剑齿象从北方迁移到秦岭南部并演化为东方剑齿象,而且主要依靠南方广泛而稳定存在的C_(3)植被为食。到末次盛冰期,气候极端寒冷,东方剑齿象灭绝,而亚洲象因为觅食生态灵活存活至今,生存区间退缩到了西南亚热带地区。展开更多
基金funded by the National Natural Science Foundation of China(Grant Nos:42061001,41501006)The Science and Technology Foundation of Guizhou Province(Grant Nos:Qianke Jichu-ZK[2021]190)Natural science research funding project of Guizhou Provincial Department of Education(Grant No.:Qian Jiao KY[2021]036).
文摘Collapse is a common geomorphic process in karst areas,especially on the Yunnan-Guizhou Plateau,which has a tectonic background of integral uplift.The frequent occurrence of collapse processes in karst underground caves and canyons indicates that collapses play an important role in the formation of canyons.Through an analysis of the morphology of a semicircular cliff in the Huajiang Grand Canyon and an investigation of sediments at the bottom of the cliff,a large-scale collapse event was found to have occurred.U-series dating of secondary calcium carbonate cement in the collapse breccias indicates that collapse processes occurred approximately 200 ka.According to the geomorphological evolution of the Huajiang Grand Canyon,the following geomorphic evolutionary process is proposed:underground river-cave hall-collapse of a tiankeng-tiankeng degradation-canyon formation.These findings also show that the dating of collapsed breccia cement can be effectively used to determine the development times of karst canyons and the formation ages of tiankengs.
文摘Based on researches done by other scholars,this paper summarized tiankeng's landscape characteristics and analyzed them.By referring to the methods and standards of tourism resources evaluation,tiankeng landscape evaluation model has been built.The evaluation index system was built in terms of the model and tiankeng's characters.After the evaluating factors and index were established,the weights of them have been figured out by AHP method.For the first time tiankeng has been studied from the view of landscape.However,this primary study about tiankeng landscape evaluation will offer reference for its tourism development and protection.It also lays the foundation for the construction of a better system.
文摘Chinese scholars Zhu xuewen put forward Tiankeng and defined it as a collapse feature which was diffe rent from the ordinary doline and developed in large-scale underground river channel.This paper analyzed the sasic conditions of Xiaoyanwan Tiankeng formation,such as sedimentary environment,climatic and hydrological conditions and so on;and deeply discussed the development course of Xiaoyanwan Tiankeng on this basis.The research result showed that Xiaoyanwan Tiankeng was completely accord with Tiankeng' definition,and was a well-developed and especially big Tiankeng in the maturation stages.
文摘末次冰期全球气候波动频繁,影响了哺乳动物的演化和迁移历史。汉中天坑群丰富的地质生物记录是重要的古气候、古环境研究材料,并使用石笋重建了秦巴地区末次冰期的季风演化历史。汉中天坑群考察过程中发现的东方剑齿象化石也为认识晚第四纪古生物演化历史和生态环境响应提供了重要的参考资料。文章对东方剑齿象样品进行铀系(U-Th)和碳十四(14C)测年,并参考化石上结晶的碳酸钙铀系年龄,判断汉中天坑群天星岩东方剑齿象的生存时代约为27.5kyr BP(kyr=千年;BP=Before the present, present定义为1950年)附近MIS3阶段的DO暖事件。结合已有的石笋氧同位素序列和其他的古气候记录,推测MIS3时期汉中地区气候很可能比现代更温暖湿润,剑齿象从北方迁移到秦岭南部并演化为东方剑齿象,而且主要依靠南方广泛而稳定存在的C_(3)植被为食。到末次盛冰期,气候极端寒冷,东方剑齿象灭绝,而亚洲象因为觅食生态灵活存活至今,生存区间退缩到了西南亚热带地区。
