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Zircon water content: Reference material development and simultaneous measurement with oxygen isotope by SIMS

Abstract

Zircon water content, an important physicochemical parameter for many geological processes, yet its measurement by secondary ion mass spectrometer (SIMS) technique is hampered by the lack of suitable reference materials and high water background, especially if large-geometry (LG)-SIMS is used. Here we described a suite of newly developed reference materials for SIMS zircon water content analysis, and a modified micro-analytical technique (using CAMECA IMS 1280-HR SIMS) that can simultaneously measure the zircon water content and oxygen isotopes. A total of 20 natural zircon grains/sherds were analyzed via Fourier Transform Infra-Red spectroscopy (FTIR), among which 8 (with good water content result reproducibility) were further SIMS analyzed. Before the SIMS analyses, the FTIR analyzed sample block were mounted with Sn-based alloy to minimize degassing and background water. As in routine SIMS oxygen isotope measurement, 16O- and 18O- were collected by two Faraday Cups, and in addition 16O1H- was simultaneously measured by an electron multiplier. The measured 16O1H/6O ratio was converted into water content, using a calibration line established based on SIMS 16O1H-/16O- ratios vs. FTIR water content. Both the internal and external precisions of corrected δ18O are <0.4 permil (2se or 2sd). Internal precision of 16O1H-/16O- ratios follows the Poisson error theoretical trend, and generally better than 0.3%. External precision (reproducibility) of 16O1H-/16O- ratios on is better than 5% (2SD) for homogenous samples, and uncertainty of the calibrated water content is ~10%.

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Supplementary files

Publication details

The article was received on 25 Feb 2019, accepted on 29 Mar 2019 and first published on 01 Apr 2019


Article type: Paper
DOI: 10.1039/C9JA00073A
Citation: J. Anal. At. Spectrom., 2019, Accepted Manuscript

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    Zircon water content: Reference material development and simultaneous measurement with oxygen isotope by SIMS

    X. XIA, Z. Cui, W. Li, W. zhang, Q. Yang, H. Hui and C. Lai, J. Anal. At. Spectrom., 2019, Accepted Manuscript , DOI: 10.1039/C9JA00073A

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