胶东西北部地区同位素地质年代学研究

一、前言对于胶东西北部地区的太古代胶东群变质杂岩,前人测得其K-Ar同位素地质年龄值仅有1664Ma;玲珑花岗杂岩体的同位素地质年龄值变化在46—476Ma之间。笔者认为上述同位素地质年龄值与它们所代表的地质体的地质特征不相一致。经笔者研究认为:胶东群和玲珑花岗杂岩均遭受了较强烈的硅、碱质交代作用。这种交代作用是发生在埋深、高温条件

STUDY ON THE ISOTOPE CHRONOLOGY OF THE ROCKS IN THE NORTHWESTERN JIAODONG DISTRICT, SHANDONG PROVINCE

It is known from the regional geological surveying recently in Northwestern Jiaodong that the oldest isotopic age value of the Archaeozoic Jiaodong Group, a metamorphic complex, is only 1664 Ma and that the isotopic age value of the Linglong granite complex varies from 46 to 476 Ma. Obviously, these age values are not consistent with the geological characters of the corresponding geological bodies. The author s study indicates that both the Jiaodong Group and the Linglong granite complex were metamorphosed ...