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国际标样Fish Canyon Tuff锆石的(U-Th)/He年龄测定
(U-TH)/HE DATING OF INTERNATIONAL STANDARD FISH CANYON TUFF ZIRCON

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王英 1   郑德文 2   李又娟 1   武颖 1  
文摘 锆石是(U-Th)/He测年体系中最常用的富含U、Th的副矿物之一。相对于磷灰石而言,锆石的He封闭温度较高(约190℃),在解决沉积盆地物源和热史恢复方面更具优势。但锆石晶体内的U、Th分带普遍发育,浓度差异明显,即使是国际普遍使用的(U-Th)/He测年标样FCT(Fish Canyon Tuff)的年龄值分散度也可约达10%。文中依托中国地震局地质研究所新建立的(U-Th)/He年代学实验室,利用配备的Alphachron He同位素质谱仪对一批FCT锆石单颗粒采用激光加热萃取后进行~4He含量测定,并应用自动进样的安捷伦7900 ICP-MS和同位素稀释剂法测定母体同位素U、 Th的含量,得到FCT锆石的年龄范围为26.61~ 31.91Ma,加权平均年龄为(28.8±3.1)Ma(2SD,n = 10),该年龄值与国际上多个实验室所获得的平均年龄((28.3±3.1)Ma,2σ,n = 127;(28.29±2.6)Ma,2σ外部误差,9.3%,n = 114)在误差范围内一致; Th/U比值范围是0.52 ~ 0.67,与国际报道值一致,说明本实验室所建立的锆石单颗粒(U-Th)/He测年实验流程可靠。
其他语种文摘 Zircon is one of the most commonly used accessory minerals rich in U and Th for(U-Th)/He dating system. Compared with apatite,zircon has a higher He closure temperature(~190℃),which gives it more advantages in solving the problem of source material and thermal history reconstruction in sedimentary basins. However,the crystals of zircons often have U and Th zoning development,with obvious differences in concentration. Even the standard sample of FCT(Fish Canyon Tuff)zircon which is widely used in(U-Th)/He dating has an average age dispersion of about 10%. In this study,the Alphachron He isotope mass spectrometer is used for laser melting of a batch of single grains of FCT zircon(11 grains)to determine their ~4He content. The contents of U and Th of parent isotopes are accurately determined by automatic injection of Agilent 7900 ICP-MS and isotope diluent method. The Th/U ratios of the 10 FCT zircons calculated with(U-Th)/He average age in this paper range from 0.52 to 0.67,which are consistent with the Th/U ratios of 186 reported so far. According to the Th/U ratios of 189 FCT zircons published in the statistical literature,we found that only three of them had high Th/U ratios,namely,1.12,1.16 and 1.5,the other 186 FCT zircons(occupy >98%)had a Th/U ratio less than 1. Based on previous results and the 10 Th/U ratios measured in this paper,196 FCT zircons have a normal Th/U ratio ranging from 0.27 to 1.00,with an average ratio of 0.56(n = 196). Excluding one abnormally old age,the(U-Th)/He ages of the remaining FCT zircons in this study range from 26.61 to 31.91Ma,with a weighted mean age of(28.8±3.1)Ma(2SD,n = 10),which is consistent with the mean age((28.3±3.1)Ma,2σ,n = 127)or(28.29± 2.6)Ma(2σ external error,9.3%,n = 114)obtained by several other international laboratories. This indicates that the zircon single particle(U-Th)/He dating process established by our laboratory is reliable. For the zircon samples with U,Th banding and concentration differences prevailing,determining the distribution of U,Th elements in the crystal prior to the(U-Th)/He experiment is essential for understanding effects of geometry and elemental zoning on nuclear recoil and diffusion and the interpretation of(U-Th)/He age data.
来源 地震地质 ,2019,41(5):1302-1315 【核心库】
DOI 10.3969/j.issn.0253-4967.2019.05.016
关键词 (U-Th)/He定年 ; FCT锆石 ; 激光熔融法 ; 同位素稀释剂法
地址

1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京, 100029  

2. 中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 0253-4967
学科 地质学
基金 中国地震局地质研究所基本科研业务专项
文献收藏号 CSCD:6624298

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引证文献 2 篇

1 周敖日格勒 冈底斯斑岩铜矿带东段早中新世剥蚀作用及对渐新世-中新世斑岩矿床时空分布的影响 西北地质,2022,55(3):286-296
被引 1 次

2 喻顺 Fish Canyon Tuff榍石He扩散及(U-Th)/He年代学研究 地质学报,2023,97(1):278-290
被引 0 次

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