Boron and magnesium isotopic composition of seawater
Boron and magnesium isotopic composition of seawater
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DOI：
10.1029/2010gc003201
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发表时间：
2010-08-18
影响因子：
3.5
通讯作者：
Rae, J. W. B.
中科院分区：
文献类型：
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作者：
Foster, G. L.;Pogge von Strandmann, P. A. E.;Rae, J. W. B.
硼和镁的同位素体系正越来越多地被用作许多环境变量和过程的替代物。这两个系统的海水同位素组成在这些研究中起着核心作用，是重要的实验室间标准。鉴于这两种元素的停留时间很长(类似于10(7)年)，人们通常认为这些系统的海水是同质的，但目前还没有系统的研究。在这里，我们介绍了来自许多大洋盆地的26-28个海水样品的B和Mg同位素组成，这些盆地的盐度(32至38PSU)、温度(-0.3至+25.9摄氏度)和水深(0至1240米)都有很大的范围。我们发现，这两个系统的长驻留时间并没有显著或系统的变化。我们建议我们所报告的平均值(Delta B-11=39.61+/-0.04 ppm(2 S.E.；n=28)，Delta mg-25=-0.43+/-0.01‰(2 S.E.；n=26)，Delta mg-26=-0.82+/-0.01 pp.(2 S.E.；n=26))用于未来有关镁和B同位素的研究。
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 (similar to 10(7) 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 degrees 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 (delta B-11 = 39.61 +/- 0.04 parts per thousand (2 s.e.; n = 28), delta Mg-25 = -0.43 +/- 0.01 parts per thousand (2 s.e.; n = 26), delta Mg-26 = -0.82 +/- 0.01 parts per thousand (2 s.e.; n = 26)) be used in future studies involving Mg and B isotopes.