SA01 – A Proposed Zircon Reference Material for Microbeam U‐Pb Age and Hf‐O Isotopic Determination,Geostandards and Geoanalytical Research

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SA01 – A Proposed Zircon Reference Material for Microbeam U‐Pb Age and Hf‐O Isotopic Determination
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2019-12-26 , DOI: 10.1111/ggr.12307
Chao Huang _{1,

2} , Hao Wang _{1,

2} , Jin‐Hui Yang _{1,

2} , Jahandar Ramezani ₃ , Chuan Yang ₄ , Shao‐Bing Zhang ₅ , Yue‐Heng Yang _{1,

2} , Xiao‐Ping Xia ₆ , Lian‐Jun Feng _{2,

7} , Jie Lin ₈ , Tian‐Tian Wang ₉ , Qian Ma _{1,

10} , Huai‐Yu He _{1,

2} , Lie‐Wen Xie _{1,

2} , Shi‐Tou Wu _{1,

2}

Affiliation

State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China
Innovation Academy for Earth Science Chinese Academy of Sciences Beijing 100029 China
Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology 77 Massachusetts Ave. Cambridge MA 02139 USA
NERC Isotope Geosciences Laboratory British Geological Survey Keyworth NG12 5GG UK
CAS Key Laboratory of Crust‐Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China
State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China
Key Laboratory of Cenozoic Geology and Environment Chinese Academy of Sciences Beijing 100029 China
State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China
State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Beijing 100083China
State Key Laboratory of Geological Processes and Mineral Resources School of Earth Science and Resources China University of Geosciences Beijing 100083China

A new natural zircon reference material SA01 is introduced for U‐Pb geochronology as well as O and Hf isotope geochemistry by microbeam techniques. The zircon megacryst is homogeneous with respect to U‐Pb, O and Hf isotopes based on a large number of measurements by laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) and secondary ion mass spectrometry (SIMS). Chemical abrasion isotope dilution thermal ionisation mass spectrometry (CA‐ID‐TIMS) U‐Pb isotopic analyses produced a mean ²⁰⁶Pb/²³⁸U age of 535.08 ± 0.32 Ma (2s, n = 10). Results of SIMS and LA‐ICP‐MS analyses on individual shards are consistent with the TIMS ages within uncertainty. The δ¹⁸O value determined by laser fluorination is 6.16 ± 0.26‰ (2s, n = 14), and the mean ¹⁷⁶Hf/¹⁷⁷Hf ratio determined by solution MC‐ICP‐MS is 0.282293 ± 0.000007 (2s, n = 30), which are in good agreement with the statistical mean of microbeam analyses. The megacryst is characterised by significant localised variations in Th/U ratio (0.328–4.269) and Li isotopic ratio (−5.5 to +7.9‰); the latter makes it unsuitable as a lithium isotope reference material.

中文翻译：

SA01 –用于微束U-Pb年龄和Hf-O同位素测定的拟议锆石参考材料

通过微束技术，引入了一种新的天然锆石参考材料SA01，用于U-Pb地球年代学以及O和Hf同位素地球化学。基于大量的激光烧蚀-电感耦合等离子体质谱法（LA-ICP-MS）和二次离子质谱（SIMS）测量，锆石大晶在U-Pb，O和Hf同位素方面是均质的。化学磨损同位素稀释热电离质谱法（CA‐ID‐TIMS）U-Pb同位素分析得出的平均²⁰⁶ Pb / ²³⁸ U年龄为535.08±0.32 Ma（2 s，n = 10）。SIMS和LA‐ICP‐MS对单个碎片的分析结果与TIMS年龄在不确定性范围内一致。该δ ¹⁸通过激光氟化确定的O值为6.16±0.26‰（2 s，n = 14），通过溶液MC-ICP-MS确定的平均¹⁷⁶ Hf / ¹⁷⁷ Hf比为0.282293±0.000007（2 s，n = 30），与微束分析的统计平均值非常吻合。巨晶的特征在于Th / U比（0.328-4.269）和Li同位素比（-5.5至+ 7.9‰）存在明显的局部变化。后者使其不适合用作锂同位素参考材料。

更新日期：2019-12-26

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