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本文通过对安徽北部两个奥陶系剖面豹皮灰岩(俗称豹斑)的宏观、微观及地球化学特征研究,认为豹皮灰岩的形成与奥陶纪灰岩沉积过程中的古岩溶作用及其后生改造密切相关。其形成演化模式可概括为4个阶段:①碳酸盐岩沉积间断暴露地表发育裂隙;②各种裂隙淋滤溶蚀形成沉积岩溶洞穴体系;③海侵导致海相沉积物充填岩溶洞穴;④回流渗透或混合作用使充填物白云石化而形成“斑”。
In this paper, macroscopic, microscopic and geochemical characteristics of leopard limestone (commonly known as leopard spot) of two Ordovician sections in northern Anhui are considered. It is considered that the formation of leopard skin limestone and the paleokarst karstification during the Ordovician limestone deposition And its subsequent transformation is closely related. Its formation and evolution pattern can be summarized into four stages: ① intermittent exposure of carbonate rocks to reveal the development of surface fissures; ② various types of fissure leaching and dissolution to form sedimentary karst caves; ③ transgression resulting in marine sediment filling karst caves; ④ return flow Permeation or mixing causes dolomitization of the filling to form a “spot.”