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Proposal for an International Molybdenum Isotope Measurement Standard and Data Representation
Author(s) -
Nägler Thomas F.,
Anbar Ariel D.,
Archer Corey,
Goldberg Tatiana,
Gordon Gwyneth W.,
Greber Nicolas D.,
Siebert Christopher,
Sohrin Yoshiki,
Vance Derek
Publication year - 2014
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2013.00275.x
Subject(s) - nist , seawater , isotope , molybdenum , homogeneous , environmental science , geology , chemistry , computer science , oceanography , physics , inorganic chemistry , quantum mechanics , natural language processing , thermodynamics
Molybdenum isotopes are increasingly widely applied in Earth Sciences. They are primarily used to investigate the oxygenation of Earth's ocean and atmosphere. However, more and more fields of application are being developed, such as magmatic and hydrothermal processes, planetary sciences or the tracking of environmental pollution. Here, we present a proposal for a unifying presentation of Mo isotope ratios in the studies of mass‐dependent isotope fractionation. We suggest that the δ 98/95 Mo of the NIST SRM 3134 be defined as +0.25‰. The rationale is that the vast majority of published data are presented relative to reference materials that are similar, but not identical, and that are all slightly lighter than NIST SRM 3134. Our proposed data presentation allows a direct first‐order comparison of almost all old data with future work while referring to an international measurement standard. In particular, canonical δ 98/95 Mo values such as +2.3‰ for seawater and −0.7‰ for marine Fe–Mn precipitates can be kept for discussion. As recent publications show that the ocean molybdenum isotope signature is homogeneous, the IAPSO ocean water standard or any other open ocean water sample is suggested as a secondary measurement standard, with a defined δ 98/95 Mo value of +2.34 ± 0.10‰ (2 s ).