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中文摘要：
在辽西-冀北地区，髫髻山组火山岩发育，同时它的测年数据也较多，但是，由于测年数据的差别较大，因而影响了相关地质问题的认识和研究．在野外，髫髻山组火山岩与之上的土城子组常常同时出露，两者是平行不整合接触．通过对该地区典型的中生代盆地（即冀北的滦平盆地、承德盆地，辽西的凌源三十家子盆地、金岭寺．羊山盆地）中髫髻山组火山岩的系统采样，尤其对上部层位进行了系统的采样，应用LA-ICP-MS方法进行了测年，并结合前人的测年结果，得出了髫髻山组火山岩的上限年龄在156～153Ma之间，并认为髫髻山组火山岩的下限年龄应该在165Ma附近，髫髻山组应该是中侏罗世晚期到晚侏罗世的产物．
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