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封面故事：内蒙古二连盆地卫镜岩体风化外貌及蚀变花岗岩单偏光照片。围绕着二连盆地西缘隆起区的卫境岩体, 发育了众多的砂岩型铀矿床。该岩体不仅体量大而且铀含量高。但铀的丢失量也很惊人, 达–45.47%。研究表明, 卫境岩体不仅为这些铀矿床提供了沉积物源, 而更重要的是提供了铀源。基于对我国北方砂岩型铀矿成矿理论与技术勘查的研究, 提出了砂岩型铀矿形成的五大控制因素(即构造、砂体、铀源、氧化带、还原剂)及其相互制约关系, 这为不断发现同类型铀矿, 提供了科学依据和理论基础。这项由东华理工大学聂逢君 研究团队取得的研究成果, 详见本期616-632页。（图片提供：聂逢君）
Cover Story：The cover photos show the weathering morphol-ogy and microscopic alteration under plane-polarized light of the Weijing granite, Inner Mongolia, China. Numerous sandstone-type ura-nium deposits (SUD) are distributed surrounding the granite and located in the western marginal uplift of the Erlian Basin. This granite is not only huge in volume, but high in uranium content and loss of uranium (–45.47%). The Weijing granite has played an important role in sedimentary source supply for both host rocks and uranium for deposit mineralization. Based on the uranium metallogenic theory and prospecting technology for SUD in North China, five key mineralization factors (tectonic, sandbody, uranium source, ox-idation zone and reductant agent) controlling SUD formation have been proposed. This pro-vides a scientific theoretical basis for the discov-ery of similar uranium deposit. The research achievement was led by Professor NIE Feng-jun, East China University of Technology. For details, see pp. 616-632 of this issue. (Photo by NIE Feng-jun)
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