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北岔沟门铅锌矿床是华北地台北缘中段最近发现的一个极具成矿远景的新矿床，对矿床成因和成矿规律 的研究刚刚起步。本文介绍了用同位素稀释－等离子质谱法，直接测定了矿床中辉钼矿的Ｒｅ－Ｏｓ等时线年龄，证明成 矿作用发生在燕山中晚期，其等时线年龄为（１５２ ± ３） Ｍａ。这一年龄反映了成矿与浅成花岗岩浆侵入活动有关，并为区内进一步找矿勘探提供了一定的依据。
The Beichagamen lead-zinc deposit is a newly discovered mineral deposit with a great potential for prospecting in the middle of the northern margin of North China. The study on the genesis and metallogenic regularity of the ore deposit has just started. In this paper, isotopic dilution-mass spectrometry (ICP-MS) was used to directly determine the Re-Os isochron age of the molybdenite in the deposit. It was proved that the mineralization took place in the middle and late Yanshan, with an isochron age of (152 ± 3) Ma . This age reflects the relationship between mineralization and intrusive activity of magmatic magma and provides a basis for further prospecting in the area.