Characterization of the potential reference material SA02 for micro-beam U–Pb geochronology and Hf–O isotopic composition analysis of zircon,Journal of Analytical Atomic Spectrometry

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Characterization of the potential reference material SA02 for micro-beam U–Pb geochronology and Hf–O isotopic composition analysis of zircon
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-12-7 , DOI: 10.1039/d0ja00409j
Chao Huang _{1,

2,

3,

4,

5} , Hao Wang _{1,

2,

3,

4,

5} , Jinhui Yang _{1,

2,

3,

4,

5} , Chuan Yang _{6,

7,

8,

9} , Zhenxin Li _{5,

10,

11,

12,

13} , Yueheng Yang _{1,

2,

3,

4,

5} , Lianjun Feng _{1,

2,

3,

4,

5} , Liewen Xie _{1,

2,

3,

4,

5} , Shitou Wu _{1,

2,

3,

4,

5}

Affiliation

In the present work, a natural zircon megacryst SA02 (the exact provenance unknown) is investigated as a new potential reference material for U–Pb geochronology and Hf–O isotopic composition analysis via micro-beam methods. The precise and accurate U–Pb age is determined by the chemical abrasion isotope dilution thermal ionization mass-spectrometry (CA-ID-TIMS) method. The resultant mean ²⁰⁶Pb/²³⁸U date is 535.10 ± 0.24 Ma (2s, n = 2), interpreted as the crystallization age of the zircon megacryst. The mean ID-TIMS ²⁰⁶Pb/²³⁸U date of 533.7 ± 3.7 Ma (2s, n = 8) is recommended as the working value for micro-beam analyses when using untreated SA02 zircon grains as the primary reference material. ²⁰⁶Pb/²³⁸U dates of 533.0 ± 6.2 Ma (2s, n = 57) and 534 ± 8 Ma (2s, n = 101) obtained by secondary ion mass spectrometry (SIMS) and laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) respectively are reproducible and in agreement with the results of ID-TIMS within < 0.3% relative analytical errors. Solution data of Hf isotope compositions measured by multi-collector ICP-MS (MC-ICP-MS) from SA02 zircon yield a mean ¹⁷⁶Hf/¹⁷⁷Hf of 0.282287 ± 0.000016 (2s, n = 31), which is recommended as a reference value for microbeam analysis. Hf isotope analyses by LA-MC-ICP-MS yield homogeneous Hf isotopic compositions with a mean ¹⁷⁶Hf/¹⁷⁷Hf of 0.282289 ± 0.000033 (2s, n = 142) identical to the solution value. The mean δ¹⁸O value measured by laser fluorination is 6.03 ± 0.28‰ (2s, n = 13), which is consistent with the result of SIMS analysis.

中文翻译：

锆石微束U–Pb地质年代学和Hf–O同位素组成分析的潜在参考材料SA02的表征

在目前的工作中，天然锆石大晶SA02（确切出处未知）被研究为通过微束方法进行U–Pb年代学和Hf–O同位素组成分析的新的潜在参考材料。精确的U–Pb年龄是由化学磨损同位素稀释热电离质谱（CA-ID-TIMS）方法确定的。所得的平均²⁰⁶ Pb / ²³⁸ U日期为535.10±0.24 Ma（2 s，n = 2），被解释为锆石大晶体的结晶年龄。ID-TIMS ²⁰⁶ Pb / ²³⁸ U的平均日期为533.7±3.7 Ma（2 s，n当使用未经处理的SA02锆石晶粒作为主要参考材料时，建议将= = 8）用作微束分析的工作值。通过二次离子质谱（SIMS）和激光烧蚀-电感耦合等离子体质谱法获得的²⁰⁶ Pb / ²³⁸ U数据为533.0±6.2 Ma（2 s，n = 57）和534±8 Ma（2 s，n = 101）（LA-ICP-MS）分别是可重现的，并且与ID-TIMS的结果相符，相对分析误差在0.3％以内。通过多收集器ICP-MS（MC-ICP-MS）从SA02锆石测量的Hf同位素组成的溶液数据得出的平均¹⁷⁶ Hf / ¹⁷⁷ Hf为0.282287±0.000016（2 s，n = 31），建议将其作为微束分析的参考值。通过LA-MC-ICP-MS进行的Hf同位素分析得出均质的Hf同位素组成，其平均¹⁷⁶ Hf / ¹⁷⁷ Hf为0.282289±0.000033（2 s，n = 142），与溶液值相同。均值δ ¹⁸通过激光测量氟化O值是6.03±0.28‰（2级小号，Ñ = 13），这与SIMS分析的结果是一致的。

更新日期：2020-12-22

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