摘要
介绍了金红石U-Pb定年方法,并对影响本底的各方面因素、同位素分馏效应、干扰峰影响等环节做了分析和讨论,提出了相关的流程改进措施,并利用改进的方法对大别山超高压榴辉岩中的金红石做了测定,获得了218.2±1.2Ma的高精度金红石U-Pb年龄。
The futile U-Pb dating methodology established at the Isotope Laboratory of Tianjin Institute of Geology and Mineral Resources is reported in this paper. Some key problems as various factors affecting U and Pb blanks, the isotopic fractionation effect and the interference isotopic peaks are discussed in detail in this paper, with some measures for improvement of the experimental methodology put forward. Rutiles separated from the ultra-high-pressure metamorphic eclogite in the Dabie Mountain was dated using the improved method, and a precise, accurate and geologically significant age of 218.2 ± 1.2 Ma was obtained.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2008年第1期77-80,共4页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目(49973020)
