摘要
锆石微区原位U-Pb定年时,测定位置的选择至关重要,直接影响锆石测年结果。锆石内部结构研究是锆石测定位置选择的重要依据,本文结合不同成因锆石的内部结构特征及其年代学意义,总结了岩浆锆石、变质锆石、热液锆石以及蜕晶化锆石的测定位置选择方法,认为组成单一的岩浆锆石是理想的U-Pb定年对象,对于成因复杂的锆石尽量选取单一成因的颗粒或晶域,避免跨晶域选择测定位置。对于跨晶域选择测定位置测定得到的年龄结果必须做适当的(如不一致线的方法)校正,才可以用于地质成因的解释,否则得到的是没有地质意义的混合年龄。
Choosing the target points in the testing zircons is very important as it directly affects the zircon dating results during the in-situ zircon U-Pb dating. In this paper, the methods of choosing target points were summa- rized for magmatic zircons, metamorphic zircon, hydrothermal zircon and metamictization zircons based on their internal structure and the Geochronology. The conclusion is that magmatic zircons with simple composition are ideal minerals for zircon U-Pb dating. The simple genetic zircon grains or crystal domains are chosen for the com- plex zircon. The results abtained from across-domains can only be used after correction by inconsistent line, oth- erwise, it is meaningless.
出处
《地质调查与研究》
2015年第3期233-238,共6页
Geological Survey and Research
基金
中国地质调查"锆石
磷灰石微区原位U-Pb同位素测试方法研究(12120114001701)"
