Ancient Buried Hill Karst Rock and Its Geochemistry Characteristics in Qianmiqiao Area
千米桥古潜山岩溶岩及其地球化学特征

There are various kinds of ancient karst rocks in Qianmiqiao area. According to the trigonometric classification of the foreign karst breccias and the classifying method of karst rocks in Ordos basin, this paper divides those rocks into eight types, including karst residual rock, karst colluviation rock, karst aggradation rock, karst deposition rock, karst ablation breccias, karst alternation rock, karst alleviation rock, karst tension crack rock. On the base of the classification, through the analysis of microelement, carbon oxygen isotope and fluid inclusion, the process of karst formation is very complicated. There are three periods, including the weathering crust karst during the exposed period, the hot fluid karst in the deep buried period and the compaction released water period.