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    Boron and magnesium isotopic composition of seawater

    Foster, G.L. and Pogge von Strandmann, Philip A.E. and Rae, J.W.B. (2010) Boron and magnesium isotopic composition of seawater. Geochemistry Geophysics Geosystems 11 (8), ISSN 1525-2027.

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    Abstract

    The isotopic systems of boron and magnesium are increasingly being used as proxies for a number of environmental variables and processes. The isotopic composition of seawater for both systems plays a central role in these studies and is an important interlaboratory standard. Given the long residence times of both elements (∼107 years) it is commonly assumed that seawater is isotopically homogenous for these systems, yet no systematic studies currently exist. Here we present the B and Mg isotopic composition of 26–28 seawater samples from a number of ocean basins that encompass a significant range in salinity (32 to 38 psu), temperature (−0.3 to +25.9°C) and water depth (0 to 1240 m). We find no significant or systematic variation for either system in accordance with their long residence times. We recommend that the mean values we report (δ11B = 39.61 ± 0.04 ‰ (2 s.e.; n = 28), δ25Mg = −0.43 ± 0.01 ‰ (2 s.e.; n = 26), δ26Mg = −0.82 ± 0.01 ‰ (2 s.e.; n = 26)) be used in future studies involving Mg and B isotopes.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): seawater, boron isotopes, magnesium isotopes, MC-ICPMS
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 07 Jan 2014 14:04
    Last Modified: 28 Sep 2017 05:46
    URI: http://eprints.bbk.ac.uk/id/eprint/8294

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