PRECISE BORON ISOTOPIC ANALYSIS OF COMPLEX SILICATE (ROCK) SAMPLES USING ALKALI CARBONATE FUSION AND ION-EXCHANGE SEPARATION
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dc.contributor.author | Tonarini S. | |
dc.contributor.author | Pennisi M. | |
dc.contributor.author | Leeman W.P. | |
dc.date.accessioned | 2020-12-14T08:35:35Z | |
dc.date.available | 2020-12-14T08:35:35Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=263280 | |
dc.identifier.citation | Chemical Geology, 1997, , 1, 129-137 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20757 | |
dc.description.abstract | We describe a technique for determining the boron isotopic composition of low-B silicate rocks which until recently have been difficult to analyze. The method involves an alkali carbonate fusion for sample dissolution, ion-exchange chromatography for boron purification, and PTIMS analysis using Cs2BO+2. Our procedure combines several previously published methods in a unique manner to simultaneously (1) achieve state-of-the-art precision and accuracy, and (2) expedite analysis with respect to competing methods. Because isotopic fractionation corrections typically are based on concurrent analyses of the SRM-951 boric acid reference standard, these data do not provide a true measure of analytical accuracy or interlaboratory biases. In this study, analytical precision and accuracy were evaluated independently through replicate analyses of the JB-2 basalt reference standard, with completely independent chemical extractions of boron in each case. The average corrected 11B10B ratio obtained is 4.0728 +/- 0.0019 (2σ external uncertainty), which corresponds to a δ11B value of +7.23 +/- 0.47%%. This result agrees closely with data obtained by Nakamura et al. [Nakamura, E., Ishikawa, T., Birck, J.L., Allegre, C., 1992. Precise boron isotopic analysis of natural rock samples using a boron-mannitol complex. Chem. Geol. 94, 193-204.] using the HF digestion method. We strongly recommend that JB-2 be analyzed routinely in future boron isotopic studies to facilitate assessment of analytical uncertainties and interlaboratory biases. | |
dc.subject | BORON | |
dc.subject | ISOTOPES | |
dc.subject | GEOCHEMISTRY | |
dc.subject | MASS SPECTROMETRY | |
dc.subject | STANDARDS | |
dc.title | PRECISE BORON ISOTOPIC ANALYSIS OF COMPLEX SILICATE (ROCK) SAMPLES USING ALKALI CARBONATE FUSION AND ION-EXCHANGE SEPARATION | |
dc.type | Статья |
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