摘要
麻山群和黑龙江群是佳木斯地块前寒武纪基底的重要组成。同位素地质年代学,是研究两群地质演化的一个重要手段。前人曾做了大量同位素年龄测定工作。通过资料收集整理,并分析了一些年龄值,认为这些年龄值分别是变质年龄、岩浆侵入年龄、混合岩化年龄及区域交代作用年龄等,却没有原岩年龄。因此解决两群时代归属纷争,应该是今后同位素年龄测定工作的重点。
The Mashan group and Heilongjiang group are major components of the base of Precambrian Jiamusi block. The isotopic geochronology is an important way for researching the geologic development of these two groups. Much work of isotopic age determinaton has been done before. On the basis of sorting out and analysing the gathering data, it is considered that these isotopic ages are not the age of protolith, but ages of metamorphism, magma intrusion, migmatization and regionel metasomatism. Hence, it will become the focal point in the later isotopic age deter mination to settle the dispute that on where the two groups belong to.
关键词
麻山群
同位素
地质年代学
地块
Mashan group, Heilongjiang group, Isotopic geochronology, Jiamusi block
