华北克拉通中部广泛发育中元古代镁铁质岩墙群。这些岩墙群未变形和未变质 ,侵位于先存破裂中 ,成为恢复华北克拉通中部中元古代构造应力场的显著标志。克拉通北部地块的镁铁质岩墙群为张剪性 ,而中部和南部地块为张性。根据华北克拉通中部中元古代镁铁质岩墙群的分布和成因机制分析 ,来恢复模拟中元古代的构造应力场。数值模拟结果表明镁铁质岩墙群在中元古代形成于伸展的大地构造背景 ,与横穿华北克拉通中部的燕辽—中条拗拉槽系的伸展作用有一定的联系。 The Middle Proterozoic mafic dyke swarms are widely developed in the central North China Craton. These dykes are not deformed and are not metamorphosed, and they invade in the pre-existing rupture and become a significant symbol of the restoration of the Mesoproterozoic tectonic stress field in the central part of the North China Craton. The mafic dikes in the northern craton are shear-thinning while the central and southern plots are extensional. According to the distribution and genetic mechanism analysis of the Mesoproterozoic mafic dikes in the middle part of the North China Craton, the tectonic stress field in the Mesoproterozoic is simulated. The numerical simulation results show that the mafic dikes formed in the extensional tectonic setting during the Mesoproterozoic, which is related to the extension of the Yanliao-Zhongdu Aulao Channel traversing the central part of the North China Craton.