摘要
崆岭杂岩包括下部基底片麻岩和上部表壳岩两部分。作者采自下部的１３个斜长角闪岩样品获得ＳｍＮｄ等时线年龄３２９０±１７０Ｍａ（２σ），加入４个伴生灰色片麻岩样品后等时线年龄变为３１５０±７９Ｍａ（２σ）。采自上部的变粒岩和斜长角闪岩分别获得锆石Ｕ＿Ｐｂ一致曲线年龄为２４２７±４２Ｍａ（２σ）和２０３１±４Ｍａ（２σ）。基于这些新的数据和前人的工作成果，探讨了崆岭杂岩的形成和地质演化。
It is agreed that the boundary level of the Jurassic Cretaceous is put in between the Dabeigou Formation (narrowsense) and Dadianzi Formation. The ages of the volcanic rocks from the Jehol(Rehe) Group and its underlying formations in Luanping County of Hebei those have bee measured by means of 40 Ar/ 39 Ar dating .The age of Jurassic-Cretaceous boundary is aroud 140±1 Ma which is recommended in this paper.
关键词
年代学
崆岭杂岩
地质演化
杂岩
铀
铅
boundary age 40 Ar/ 39 Ar dating boundary of the Jurassic Cretaceous
