In:
Geostandards and Geoanalytical Research, Wiley
Abstract:
Solution MC‐ICP‐MS is an established technique for high precision boron isotope measurement results (δ 11 B SRM 951 ) in carbonates, yet its application to silicate rocks has been limited. Impediments include volatilisation during silicate dissolution and contamination during chemical purification. To address this, we present a low‐blank sample preparation procedure that couples hydrofluoric acid‐digestion and low‐temperature evaporation (mannitol‐free), to an established MC‐ICP‐MS measurement procedure following chemical purification using B‐specific Amberlite IRA 743 resin. We obtain accurate δ 11 B SRM 951 values (intermediate precision ±0.2‰) for boric acid (BAM ERM‐AE121 19.65 ± 0.14‰) and carbonate (NIST RM 8301 (Coral) 24.24 ± 0.11‰) reference materials. For silicate reference materials covering mafic to felsic compositions we obtain δ 11 B SRM 951 with intermediate precision 〈 ±0.6‰ (2 s ), namely JB‐2 6.9 ± 0.4‰; IAEA‐B‐5 ‐6.0 ± 0.6‰; IAEA‐B‐6 ‐3.9 ± 0.5‰ (2 s ). Furthermore, splits of these same reference materials were processed by an alternative fusion and purification procedure. We find excellent agreement between δ 11 B SRM 951 measurement results by MC‐ICP‐MS of the reference materials using both sample processing techniques. These measurement results show that our sample processing and MC‐ICP‐MS methods provide consistent δ 11 B SRM 951 values for low B‐mass fraction samples. We present new data from Mid Ocean Ridge Basalt (MORB) glass, documenting a range in δ 11 B SRM 951 from ‐5.6 ± 0.3‰ to ‐8.8 ± 0.5‰ (2 s ), implying some upper mantle δ 11 B SRM 951 heterogeneity.
Type of Medium:
Online Resource
ISSN:
1639-4488
,
1751-908X
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2276474-4
detail.hit.zdb_id:
2595219-5
detail.hit.zdb_id:
2134777-3
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