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

Huang, Chao; Wang, Hao; Yang, Jinhui; Yang, Chuan; Li, Zhenxin; Yang, Yueheng; Feng, Lianjun; Xie, Liewen; Wu, Shitou. 2021 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, 36 (2). 368-374. 10.1039/D0JA00409J

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Official URL: http://dx.doi.org/10.1039/D0JA00409J

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1039/D0JA00409J
ISSN:	0267-9477
Date made live:	23 Mar 2021 12:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529936

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1039/D0JA00409J

ISSN:

0267-9477

Date made live:

23 Mar 2021 12:26 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/529936