d30Si and d29Si determinations on USGS BHVO-1 and BHVO-2 reference materials with a new configuration on a Nu Plasma multi-collector ICP-MS
Abraham, K.; Opfergelt, S.; Fripiat, F.; Cavagna, A.-J.; de Jong, J.T.M.; Foley, S.F.; André, L.; Cardinal, D. (2008). d30Si and d29Si determinations on USGS BHVO-1 and BHVO-2 reference materials with a new configuration on a Nu Plasma multi-collector ICP-MS. Geostand. Geoanal. Res. 32(2): 193-202. dx.doi.org/10.1111/j.1751-908X.2008.00879.x
In: Geostandards and Geoanalytical Research. International Association of Geoanalysts/Wiley: Vandoeuvre-lès-Nancy. ISSN 1639-4488; e-ISSN 1751-908X
We report silicon isotopic determinations for USGS rock reference materials BHVO-1 and BHVO-2 using a Nu Plasma multi-collector (MC)-ICP-MS, upgraded with a new adjustable entrance slit, to obtain medium resolution, as well as a stronger primary pump and newly designed sampler and skimmer cones (“B” cones). These settings, combined with the use of collector slits, allowed a resolution to be reached that was sufficient to overcome the 14N16O and 14N2 interferences overlying the 30Si and the 28Si peaks, respectively, in an earlier set-up. This enabled accurate measurement of both d30Si and d29Si. The d value is expressed in per mil variation relative to the NBS 28 quartz reference material. Based on data acquired from numerous sessions spread over a period of six months, we propose a recommended average d30Si of -0.33 ± 0.05‰ and -0.29 ± 0.11‰ (2se) for BHVO-1 and BHVO-2, respectively. Our BHVO grand mean silicon isotope composition (d30Si =-0.31 ± 0.06‰) is significantly more negative than the only published value for BHVO-2, but is in very good agreement with the recently established average value of ocean island basalts (OIB), confirming the conclusion that the OIB reservoir has a distinct isotopic composition from the solar reservoir as sampled by chondrites.
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