| Geological relics can record and reflect the evolution of the earth,such as geological environment change,sea-land change and biological evolution,etc.It is not only an integral part of the ecological environment,but also an important part of non-renewable natural heritage.It has great scientific value.The establishment and development of geological park depends on geological heritage landscapes.The grade and scale of geological parks is also directly determined by characteristics of the geological heritage landscapes.Therefore,the investigation and evaluation of geological relics is of great significance to the construction and development of geological parks in the construction of geological parks.Zhashui Cave National Geopark is located in Zhashui County,southern Shaanxi Province.The park includes Jiutianshan Scenic Area,Karst Cave Scenic Area,East-West Gangou Scenic Area and Devonian Section Scenic Area.It is a geological park featuring geological relics such as Stratigraphic Lithofacies Profile of Qinling Orogenic Belt,structural features and karst landscape.This paper introduces the natural geographical environment,geological background and social and economic conditions ofthe park.By sorting out the existing classification criteria of geological relics,the types of geological relics in the park are divided into four major categories,seven categories and eight subcategories.Among them,the four major categories conclude geological profile,geological structure,water landscape and geomorphologic landscape.Through investigation,Devonian lithofacies profile and karst landscape are established as core geological relics of the park and the main body of the National Geological Park of the Zhashui Cave.Through field investigation and comprehensive analysis of literatures,the characteristics and geological value of Devonian lithofacies profile and karst geomorphic geological relics,core geological relics of the park,are discussed.The characteristics of Devonian lithofacies profiles are analyzed from 8 stratigraphic units and 14 geological sites.The geological value ofDevonian lithofacies profiles is systematically expounded based on the three sedimentary environment changes of Devonian.This paper studies the karst geomorphological and geological relics from the characteristics of peak cluster,karst cave group and cave sediment types,and discusses its geographic value from the perspective of the genesis of park karst geomorphology.In this paper,we use analytic hierarchy process and Delphi method to make analysis.Based on the attributes of geological relics and the characteristics of their development and utilization,a comprehensive evaluation system of geological heritage resources is constructed,the weights of each evaluation factor are calculated,and the scoring data of each evaluation factor are collected by selecting two first-level indicators of resource value and exploitation and utilization conditions of geological relics,six second-level indicators of resource condition,scientific value,ornamental value,location condition,development condition and protection condition,and 21 three-level indicators of the abundance,scale,combination and integrity,science popularization and scientific research of geological relics resources,etc.According to the classification criteria of geological heritage grade in the Classification,Investigation and Evaluation of Tourism Resources(GB/T18972-2003),quantitative evaluation of the three core geological heritage resources of the park,i.e.section,karst cave and peak cluster,are completed.The result shows that the Devonian section of the park belongs to the world-class geological heritage resources,the karst cave group belongs to the national geological heritage resources,and the peak clusters reach the provincial level.Finally,based on the current situation of Park geological heritage resources and main factors that affect the protection of geological heritage,and combined with the quantitative evaluation results,some suggestions for protecting Park core geological heritage resources are put forward,including grading and dividing protected areas and increasing investment to improve infrastructures. |
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