Combined Sr isotope and trace element analysis of melt inclusions at sub-ng levels using micro-milling, TIMS and ICPMS

This paper describes a technique, which allows precise and accurate Sr isotope measurement combined with trace element analysis of individual melt inclusions, of sample sizes ≪1 ng of Sr. The technique involves sampling by micro-milling, chemical dissolution, micro Sr column chemistry, TIMS, and ICP...

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Bibliographic Details
Published in:Chemical geology 2009-03, Vol.260 (3-4), p.254-268
Main Authors: Harlou, R., Pearson, D.G., Nowell, G.M., Ottley, C.J., Davidson, J.P.
Format: Article
Language:English
Subjects:
ICPMS
Melt inclusion
Micro-milling
Sr isotope
Sub-ng Sr
TIMS
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Summary:This paper describes a technique, which allows precise and accurate Sr isotope measurement combined with trace element analysis of individual melt inclusions, of sample sizes ≪1 ng of Sr. The technique involves sampling by micro-milling, chemical dissolution, micro Sr column chemistry, TIMS, and ICPMS analyses. A 10% aliquot of each sample solution is used for trace element analysis by double focusing magnetic sector field ICPMS, while Sr is chemically separated from the remaining 90% and used for 87Sr/86Sr determinations by TIMS. During the development of the technique outlined above, we documented in detail the potential sources of blank contributions and their magnitude. The average size and Sr isotope composition of our laboratory total procedural blank during this study was 5.4 pg±0.3 pg Sr (n=21) with an 87Sr/86Sr of 0.7111±0.0002 (2SE, n=3). The total procedural Rb blank was 1.9±0.7 pg (n=21). The total procedural blank was found to have minimal effect (
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2008.12.020