关键词: 沉积—改造型萤石矿, 火山岩型铀矿, 成矿模式, 层间断裂, 找矿意义

Abstract: Fluorite mineralization is closely related to volcanic type uranium deposits.In order to analyze the potential relevance between fluorite mineralization and volcanic type uranium metallogenic model，through field geological mapping and regional metallogenic data analysis，the metallogenic model of fluorite deposits in Siwangziqi is discussed.The study results show that:①fluorite deposits in Siziwangqi are mainly distributed in the interlayer fracture zone of rhyolite，rhyolite tuff and phyllitic slate and schist of Dashizhai Formation of Lower Permian Series，orebodies are mainly controlled by the regional Xilimiao Syncline，distribution direction of the south wing of the fold is NEE，and the distribution direction of the north wing of the fold is NNE，the fluorite metallogenic temperature and materials are provided by Yanshanian biotite granitic magmatic intrusion；②fluorite metallogenic stage can be divided into three stages，the formation period of initial ore source strata in Early Permian，large-scale metallogenic enrichment period of Early Yanshanian and superimposed metallogenic period of Late Yanshanian；③the fluorite orebodies are controlled by strata，structures and magmatic activities，the large-scale metallogenic activities are completely controlled by interlayer faults，the deposit belongs to sedimentary-modified fluorite deposit，besides that，the above three metallogenic stages of fluorite deposits in Siziwangqi are coupled with the migration，enrichment and precipitation processes of regional uranium metallogenic materials，therefore，the metallogenic model of fluorite deposits in Siziwangqi has good prospecting significance for volcanic type uranium deposits.

Key words: Sedimentary-modified fluorite deposit, Volcanic type uranium deposit, Metallogenic model, Interlayer fault, Prospecting significance