Proposal for an International Molybdenum Isotope Measurement Standard and Data Representation.

Nägler, Thomas F., Anbar, Ariel D., Archer, Corey, Goldberg, Tatiana, Gordon, Gwyneth W., Greber, Nicolas D., Siebert, Christopher, Sohrin, Yoshiki and Vance, Derek (2014) Proposal for an International Molybdenum Isotope Measurement Standard and Data Representation. Geostandards and Geoanalytical Research, 38 (2). pp. 149-151. DOI 10.1111/j.1751-908X.2013.00275.x.

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Abstract

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 Mo-98/95 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 Mo-98/95 values such as +2.3 parts per thousand for seawater and -0.7 parts per thousand 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 Mo-98/95 value of +2.34 +/- 0.10 parts per thousand (2s).

Document Type: Article
Additional Information: WOS:000336210400002
Keywords: NIST SRM 3134; Mo isotope ratios; MC-ICP-MS; Mo isotope reference standard; community statement; NIST SRM 3134; rapports isotopiques du Mo; MC-ICP-MS; standard de reference des isotopes du Mo; declaration communautaire
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/j.1751-908X.2013.00275.x
ISSN: 1639-4488
Date Deposited: 24 Jun 2014 10:29
Last Modified: 21 Jul 2017 09:55
URI: http://oceanrep.geomar.de/id/eprint/24887

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