高精度铅同位素~(207)pb-~(204)pb双稀释剂TIMS测试方法
Highly precise Pb isotope analysis by ~(207)Pb-~(204)Pb double spike method using TIMS
查看参考文献35篇
|
文摘
|
利用热电离质谱(TIMS)和~(207)-pb-~(204)pb双稀释法测定低含量Pb岩石样品的同位素比值,可以有效校正由质谱分析造成的同位素分馏效应,提高铅同位素比值测定的精度和准确度。本文利用中国科学院广州地球化学研究所Triton TIMS,建立了~(207)-pb-~(204)pb双稀释剂测试方法,并对Pb含量为5~20 ng的国际标样SRM981进行3个月的TIMS仪器测定,双稀释剂法外部校正后得到的~(206)Pb/~(204)Pb、~(207)Pb/~(204)Pb和~(208)Pb/~(204)Pb外部精度分别为±0.0034、±0.0046和±0.0100(2sd,n=28)。达到或优于其他国际高水平TIMS实验室双稀释剂法测定精度。同时,运用新方法对国际岩石标样AGV-2和BCR-2进行测定,得到的比值分别为:~(206)Pb/~(204)Pb=18.870±0.006、~(207)Pb/~(204)Pb=15.619±0.003、~(208)Pb/~(204)Pb=38.546±0.012和~(206)Pb/~(204)Pb=18.752±0.011、~(207)Pb/~(204)Pb=15.619±0.005、~(208)Pb/~(204)Pb=38.723±0.020,与国际同类实验室测定结果和精度一致,表明该新建方法是可靠的。运用~(207)Pb-~(204)Pb双稀释剂法对岩石样品进行测定,可获得高精度铅同位素比值,尤其对低含量Pb的基性、超基性地质样品测定有很大的优势。 |
|
其他语种文摘
|
~(207)Pb-~(204)Pb double spike method has been developed at Guangzhou Institute of Geochemistry in order to obtain high quality Pb isotope ratio. This method could effectively correct the mass fractionation effects for Pb isotopic analysis of samples with low Pb concentration by thermal ionization mass spectrometry (TIMS). The minimum amount of Pb per load can be as low as 5x10~(-9)-20x10~(-9) g, and the analysis method could effectively improve precision and accuracy. In this study, we determined Pb isotopic composition of SRM 981 using ~(207)Pb-~(204)Pb double spike, the external precisions of ~(206)Pb/~(204)Pb, ~(207)Pb/~(204)Pb and ~(208)Pb/~(204)Pb are±0.0034,±0.0046 and ±0.0100 (2xsd, n = 28, t = 3 months). Meanwhile we have analyzed standard reference rocks of USGS: AGV-2 and BCR-2 by using the same procedure, the isotopic ratios for AGV-2 and BCR-2 are ~(206)Pb/~(204)Pb = 18.870±0.006, ~(207)Pb/~(204)Pb = 15.619±0.003, ~(208)Pb/~(204)Pb = 38.546±0.012 and ~(206)Pb/~(204)Pb = 18.752±0.011, ~(207)Pb/~(204)Pb = 15.619±0.005, ~(208)Pb/~(204)Pb = 38.723±0.020, respectively. These values are identical to published data within uncertainty, independent of minor variations in loading and run parameters. Specially, this method is superb for precise and accurate isotope analyses of geological samples such as mafic and ultramafic rocks with low level Pb concentration, and will be a powerful tool in the future. |
|
来源
|
地球化学
,2013,42(2):103-115 【核心库】
|
|
关键词
|
铅同位素
;
双稀释剂法
;
热电离质谱
;
地质样品
|
|
地址
|
1.
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;;广西隐伏金属矿产勘查重点实验室, 广东, 广州, 510640
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, 广东, 广州, 510640
3.
Scripps Institution of Oceanography, UCSD, USA, La Jolla, 92093
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0379-1726 |
|
学科
|
地质学 |
|
基金
|
广西自然科学基金
;
国家973计划
;
中国科学院广州地球化学研究所公共技术资助项目
;
国家自然科学重点基金
|
|
文献收藏号
|
CSCD:4794117
|
参考文献 共
35
共2页
|
|
1.
Woodhead J D. Application of the 'double spike' technique to Pb-isotope geochronology.
Chem Geol,1997,138(3/4):311-321
|
被引
7
次
|
|
|
|
|
2.
Todt W. ~(202)Pb-~(205)Pb double spike for high-precision lead isotopic analyses.
Earth Processes: Reading the Isotopic Code (Geophysical Monograph, vol.95),1996:429-437
|
被引
10
次
|
|
|
|
|
3.
Woodhead J. Routine lead isotope determinations using a lead-207-lead-204 double spike: A long-term assessment of analytical precision and accuracy.
Analyst,1995,120(1):35-39
|
被引
7
次
|
|
|
|
|
4.
Hamelin B. Precise lead isotope measurements by the double spike technique: A reconsideration.
Geochim Cosmochim Acta,1985,49(1):173-182
|
被引
7
次
|
|
|
|
|
5.
Amelin Y. Isotopic analysis of lead in sub-nanogram quantities by TIMS using a ~(202)Pb-~(205)Pb spike.
J Anal At Spectrom,2006,21(10):1053-1061
|
被引
3
次
|
|
|
|
|
6.
Dodson M H. Simplified equations for double-spiked isotopic analyses.
Geochim Cosmochim Acta,1970,34(11):1241-1244
|
被引
4
次
|
|
|
|
|
7.
Thirlwall M F. Inter-laboratory and other errors in Pb isotope analyses investigated using a ~(207)Pb-~(204)Pb double spike.
Chem Geol,2000,163(1/4):299-322
|
被引
5
次
|
|
|
|
|
8.
Thirlwall M F. Multicollector ICP-MS analysis of Pb isotopes using a ~(207)Pb-~(204)Pb double spike demonstrates up to 400 ppm/amu systematic errors in Tl-normalization.
Chem Geol,2002,184(3/4):255-279
|
被引
14
次
|
|
|
|
|
9.
Woodhead J. A simple method for obtaining highly accurate Pb isotope data by MC-ICP-MS.
J Anal At Spectrom,2002,17(10):1381-1385
|
被引
11
次
|
|
|
|
|
10.
Woodhead J D. Pb-isotope analyses of USGS reference materials.
Geostand Geoanal Res,2000,24(1):33-38
|
被引
8
次
|
|
|
|
|
11.
Dodson M H. A theoretical study of the use of internal standards for precise isotopic analysis by the surface ionization technique Part II: Error relationships.
J Phys E,1969,2(6):490-498
|
被引
1
次
|
|
|
|
|
12.
Compston W. Lead Isotopic Analysis Using a Double Spike.
J Geophys Res,1969,74(17):4338-4348
|
被引
8
次
|
|
|
|
|
13.
Kuritani T. Highly precise and accurate isotopic analysis of small amounts of Pb using ~(205)Pb-~(204)Pb and ~(207)Pb-~(204)Pb,two double spikes.
J Anal Atom Spectrom,2003,18(12):1464-1470
|
被引
4
次
|
|
|
|
|
14.
Kuritani T. Precise isotope analysis of nanogram-level Pb for natural rock samples without use of double spikes.
Chem Geol,2002,186(1/2):31-43
|
被引
7
次
|
|
|
|
|
15.
Makishima A. Precise determination of Pb isotope ratios by simple double spike MC-ICP-MS technique without Tl addition.
J Anal At Spectrom,2007,22(4):407-410
|
被引
2
次
|
|
|
|
|
16.
Kuritani T. Accurate isotopic and concentration analyses of small amounts of Pb using isotope dilution coupled with the double spike technique.
Geostand Geoanal Res,2006,30(3):209-220
|
被引
1
次
|
|
|
|
|
17.
Thirlwall M F. Mantle components in Iceland and adjacent ridges investigated using double-spike Pb isotope ratios.
Geochim Cosmochim Acta,2004,68(2):361-386
|
被引
4
次
|
|
|
|
|
18.
常向阳. 铅同位素研究新进展--"双稀释剂"测定方法和"AGSO-CSIRO"模式年龄.
地质地球化学,1999,27(2):93-98
|
被引
6
次
|
|
|
|
|
19.
郭庆军. 铅同位素“双稀释剂”同位素定年法计算方法研究.
矿物岩石地球化学通报,2000,19(3):193-196
|
被引
2
次
|
|
|
|
|
20.
王林森. 用双稀释法测定地质样品中的铅同位素组成.
矿物岩石,2003,23(2):44-48
|
被引
4
次
|
|
|
|
|
了解气象卫星更多信息，请访问