地质力学学报2025，Vol.31Issue(2)：278-286,9.DOI:10.12090/j.issn.1006-6616.2024136
河北兴隆国家地质公园溶洞的成因及时代探讨
The genesis and age of karst caves in Xinglong National Geopark,Hebei Province
摘要
Abstract
[Objective]Karst caves,as an essential part of the Earth's Critical Zone,hold significant scientific and scenic value.However,previous studies have largely overlooked the tectonic factors influencing cave formation,and quantitative constraints on the age of cave formation remain scarce.This study aims to investigate the genesis and chronology of the Xinglong Karst Cave in the Taojiatai area of Hebei Province,elucidating the controlling factors and temporal constraints of cave development.[Methods]A comprehensive investigation of cave morphology,stratigraphic attitude,and tectonic characteristics was conducted,supplemented by mineralogical analysis using X-ray diffraction and geochemical element analysis.The study analyzed the relationship between cave formation and fault activity,while the geochemical composition of red clay deposits inside the cave was compared with external weathering crusts to constrain the formation age of the cave.[Results]The cave developed within Middle Proterozoic dolomitic limestone containing flint nodules,influenced by two major faults that facilitated differential dissolution along fault planes.The red clay deposits inside the cave share geochemical characteristics with external weathering crusts,indicating an exogenous origin.The enrichment of iron in red stalactites suggests leaching from surface water,further confirming the post-weathering deposition of the red clay.Regional comparisons reveal that the residual red clay outside the cave corresponds to the Tangxian planation period(3.1-3.7 Ma),indicating that the cave must have formed after this period.[Conclusion]This study provides new insights into the fault-controlled genesis of the Xinglong Karst Cave and establishes a minimum formation age of 3.7 Ma,significantly younger than the Middle Proterozoic age of the host rock.The findings correct the previous misconception that the cave formed during the Proterozoic and highlight the crucial role of tectonic activity in cave development.[Significance]This research enhances our understanding of the tectonic control and chronological constraints of karst cave formation,providing valuable references for the study of karst landscapes in other regions.关键词
溶洞/构造/古土壤/地球化学/国家地质公园/兴隆县Key words
karst cave/tectonics/paleosoil/geochemistry/National Geopark/Xinglong County分类
地质学引用本文复制引用
张皓月,姜群鸥,张绪教,王姗..河北兴隆国家地质公园溶洞的成因及时代探讨[J].地质力学学报,2025,31(2):278-286,9.基金项目
国家自然科学基金项目(42301094) （42301094）
中央高校基本科研业务费专项资金项目(BLX202313)This research is financially supported by the National Natural Science Foundation of China(Grant No.42301094)and the Fundamental Research Fund for the Central Universities(Grant No.BLX202313). （BLX202313）
