Xuefengshan-Miaoershan area is an carbonaceous-siliceous-argillaceous type uranium mineralization cluster with a lot of deposits,occurrences and anomalies.By systematically comparing the known deposits they can be devided into four types by the dominant genesis,they are sedimental-hydrothermalinfiltration type,sedimental-diagenetic type,sedimental-epigenetic type,and sedimental-hydrotherm superimposed type.Further,the regional geological environment were analyzed and four uranium metallogenic stages were identified by expounding the uranium mineralizing feature of each stage.By studying the relationship between uranium mineralization and regional metallogenesis,sedimentary facies,tectonics,downfaulted red basin,and plutons,the writers summarized the spatial and temporal distribution of uranium ore-formation in the region,and set up the regional uranium ore-forming model and mineralized pedigree.%雪峰山-苗儿山成矿带是碳硅泥岩型铀矿床产出集中区,已发现大量的铀矿床、矿点和异常点.笔者对已有的铀矿床进行系统对比分析,按主导成因将矿床划分为4种类型,分别是沉积-成岩型、沉积-外生改造型、沉积-热液-淋积型和沉积-热液叠加改造型.在此基础上,分析了区域成矿地质环境,划分了4个成矿演化阶段,并分别阐述了各阶段的铀成矿特征.通过分析区域成矿作用、沉积相、构造、断陷红盆、侵入岩体等与铀成矿的关系,总结出区域铀成矿的时空分布规律,建立了区域铀成矿模式.
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