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封面故事：冀北钼矿找矿勘查显示区内存在的两种类型钼矿石。一种在成因上与燕山期酸性岩体关系密切, 金属矿物以高温形成的辉钼矿为主, 矿化与岩体侵位时代接近, 成矿流体以高温、高盐度为特征, 矿产品以钼精粉为主; 另一种仅在空间上与燕山期酸性岩体分布紧密伴生, 矿物以低温胶硫钼矿为主, 由于缺少合适的定年矿物, 胶硫钼矿形成时代目前存在较大争议, 已有资料显示胶硫钼与岩体侵位时代相差较大, 胶硫钼矿多与铀矿伴生, 成矿流体以低温、低盐度为特征, 矿产品以钼氨酸为主。这项由河北地质大学李随民教授和河北省地矿局韩玉丑教授级高工合作取得的研究成果, 详见本期第967-982页。（图片提供：李随民）
Cover Story：There are two types of molybdenum ores in northern Hebei Province. One is closely related to the acidic rock mass of the Yanshanian epoch. The metal-bearing mineral is mostly molybdenite, the ore-forming fluid was characterized by high tem-perature and salinity, and molybdenum concen-trate powder is the main mineral product. The other is closely spatially associated with the distri-bution of Yanshanian acid rock and consists of jordisite as its main molybdenum-bearing min-eral. Due to the lack of suitable minerals for dating, the formation age of the jordisite remains unclear. Existing data indicate that the formation age of the jordisite and the age of emplacement of the rock mass are different. The jordisite is mostly associat-ed with uranium ore, the ore-forming fluid was characterized by low temperature and salinity, and the main mineral product is molybdic acid. This research was led by Professor LI Sui-min of He-bei GEO University and Professor HAN Yu-chou of the Hebei Provincial Bureau of Geology and Mineral Resources. For details, see pp. 967-982 of this issue. (Photo by LI Sui-min)
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