Abstract Paleocave play a crucial role in the storage and transport of karst groundwater in the covered area,and the exploration and identification of their morphological and internal structural characteristics are of certain guidance for understanding the formation process of karst in covered coal fields and the prevention and control of karst water inrush damage in mines. In recent years,through a detailed geological investigation of the Ordovician karst outcrops in the Shungeng mountain in Huainan,Anhui Province,on the southern edge of the North China Plate,a typical paleokarst cave was found at the Ordovician formations. This study analyzes the morphological features and internal structures of the paleocave using field observations,microstructural identification,paleohydrology,and paleotectonics. The cave developed along the sedimentary interfaces between the Majiagou and Xiaoxian formations,exhibiting varying widths—wider on the west side and narrower on the east. The maximum vertical height between layers reached 9.8 meters,and the cave extended over a length of 125 meters. Evidence of paleowater erosion and corrosion is preserved on the cave ceiling,and gravity-induced collapses have resulted in various fill types,including debris collapse fill,chemical fill,and mixed fill,primarily consisting of limestone and dolomite,with minerals such as calcite,dolomite,and cryptocrystalline silica. Combined with the regional geological and tectonic evolution,paleocave formation experienced four stages: the fissure development,interlayer karst formation,,interlayer cave growth,and collapse filling and compaction,which are mainly controlled by layer fissure,erosive fluid and vertical karst zoning. The results can provide useful reference for prevention and treatment of deap karst water inrush in Huainan and other North China coalfields.
Fund:Financially supported by the National Natural Science Foundation of China(No.42172279)
Corresponding Authors:
XU Guangquan,born in 1967,Ph.D.,professor, is mainly engaged in research on hydrogeology. E-mail: gqxu67@163.com.
About author: YANG Tingting,born in 1993,a Ph.D. candidate in Anhui University of Science & Technology,is mainly engaged in researches on hydrogeology and karst hydrology. E-mail: ahaqytt@126.com.
Cite this article:
YANG Tingting,XU Guangquan,HE Yupeng et al. Developmental characteristics and formation of the Ordovician paleocaves in Shungeng mountain,Huainan of Anhui Province,China[J]. JOPC, 2024, 26(3): 620-631.
YANG Tingting,XU Guangquan,HE Yupeng et al. Developmental characteristics and formation of the Ordovician paleocaves in Shungeng mountain,Huainan of Anhui Province,China[J]. JOPC, 2024, 26(3): 620-631.
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