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华北地台北缘的燕辽和南缘的东秦岭两个钼矿带闻名遐迩。本文用同位素稀释－等离子体质谱法，直接测定了燕辽钼矿带中兰家沟钼矿床的Ｒｅ－Ｏｓ等时线年龄为（１８６．５±０．７）×１０６ａ，杨家杖子和肖家营子钼矿床的Ｒｅ－Ｏｓ模式年龄为（１８７±２）×１０６～（１９１±６）×１０６ａ和（１７７±５）×１０６ａ，小寺沟和寿王坟铜（钼）矿床的Ｒｅ－Ｏｓ模式年龄为（１３４±３）×１０６ａ和（１４８±４）×１０６ａ，大湾和大庄科钼矿床的Ｒｅ－Ｏｓ模式年龄为（１４４．４±７．４）×１０６ａ和（１４４．７±１０．７）×１０６～（１４７．１±６．６）×１０６ａ。结合东秦岭钼矿带内钼矿床的Ｒｅ－Ｏｓ年龄，证明华北地台内有早元古代钼矿化，两个钼矿带中的钼或铜（钼）矿床的成矿时代主要为印支期和燕山早期或中—晚期。Ｒｅ－Ｏｓ法不仅是直接测定钼（铜）硫化物矿床成矿年龄的一种新手段，而且所获结果为研究区域成矿演化提供了确实的依据。
The northern margin of the North China Yan Liao and the southern margin of the East Qinling two molybdenum belt known. In this paper, isotope dilution-mass spectrometry was used to directly determine the Re-Os isochron age of the Zhongjiagou molybdenum deposit in Yanliao molybdenum belt (186.5 ± 0.7) × 106a. Yang and Zhang The Re-Os mode age of the Yingyingzi molybdenum deposit is (187 ± 2) × 106-191 ± 6 × 106a and (177 ± 5) × 106a. The Re-Os ages of the Xiaosigou and Shouwangfen copper- (134 ± 3) × 106a and (148 ± 4) × 106a. The Re-Os model ages of the Dawan and Dazhuangke molybdenum deposits were (144.4 ± 7.4) × 106a and (144.7 ± 10.7) × 106 ~ (147.1 ± 6.6) × 106a. Based on the Re-Os ages of molybdenum deposits in eastern Qinling molybdenum belt, it is proved that there are early Proterozoic molybdenum mineralization in the North China platform. The mineralization age of the molybdenum or copper (molybdenum) deposits in the two molybdenum belts is mainly the Indo-China Period and Yanshan early or middle - late. The Re-Os method is not only a new method to directly determine the metallogenic age of molybdenum (copper) sulfide deposits, but also the results provide a solid basis for studying the regional metallogenetic evolution.