华北煤田南缘表生岩溶发育特征及演化过程

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中图分类号：P642.4 文献标志码：A 文章编号：1672-1098（2025）01-0001-10

Abstract：Objective Toinvestigatethemechanismthatepigene karst not only improves the permeabilityand conectivity of carbonate rock formations，but also provides storage sitesand channels for groundwater storage and transport，especially in controlling the formation ofkarst water hazards toour coalfield.Methods The development characteristics of epikarst and its evolution process were analyzed systematically，bytakingthe Cambrian karst strata of the Shangyao area in Huainan，situatedon the southern edge of the north China coalfield，as theobject，with such methodsas field geological survey，profile survey，statistical analysisand thin section identification，combined with regional sedimentary history and structural history.Results Theepikarst mainly developed in the hanging wallof the nappe block，Mantou Formationand Maozhuang Formation carbonate strata in the syncline core，and Houjiashan Formation strata in two wingsof the syncline.Epikarst，mainly existing in the form of fissures，dissolved cracks and pores，developed along the vertical direction，inthe orientations of NE，NW，NNE and NNW，butsomeoffissures and dissolved cracksdid along the bedding plane.Thelithologyand rock structures，squeezing-stretching and wide synclines，faults，and fractures were the maincontroling factors of thedevelopment of epikarst.Besides，the vegetation and runoff accelerated the development processof epikarst.Conclusion The evolution process of epikarst has gone throughthe early stages of sedimentationand compresson，and the late stagesof tension，dissolution and networking.The research results provide theoretical basis for the study of karst water occurrence mechanism in the covered areas of Huainan coalfield and the prevention and control of karst water hazards.

Key words： nappe structure;epigenetic karst;karst formation and evolution;Shangyao area

关于表生岩溶，国内外学者主要围绕发育特征以及控制因素展开了一系列相关研究，其中，影响表生岩溶发育的因素包括地质构造、生态环境、水文地质条件[1-2]，以及识别标志、油气储存以及成岩作用等[3]。（剩余8104字）