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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.
In Liaoxi-northern Hebei area, the volcanic rocks in Qiangjiashan Formation are developed and their dating data are also large, however, due to the large difference in dating data, the understanding and research of related geological problems are affected. In the wild, The volcanic rocks of this group and the Tuchengzi Formation above are often exposed at the same time, and the two are in parallel and unconformity contact.Through the analysis of the typical Mesozoic basins in the area (ie, Luanping Basin in Hebei Province, Chengde Basin in Liaoning Province, Basin, Jinlingsi-Yangshan Basin), the LAZ-ICP-MS method was used to systematically sample the volcanic rocks in the Zhongjiji Lishan Formation, especially the upper strata. According to the dating results of the predecessor , The upper limit age of volcanic rocks in Qiaomishan Formation is between 156 and 153 Ma. It is concluded that the lower limit of age of volcanic rocks in Qiaomishan Formation should be around 165Ma and that of Qiaomishan Formation should be the product of Late Middle Jurassic to Late Jurassic.