Abstract The concentrations and isotopic compositions of rhenium are presented from seawater samples obtained from the primary station for the Bermuda Atlantic Time Series Study in the North Atlantic Ocean and from the 40oS UK GEOTRACES expedition in the South Atlantic Ocean. Salinity-normalized Re concentrations in both locations range between ∼6.8–7.7 ppt between 50–5000 m depth, consistent with previously published concentration data from the North Atlantic and North Pacific Oceans. Rhenium isotope values (expressed as δ187/185Re relative to NIST 3143) exhibit minimal variation around an average value of −0.17 ± 0.12‰ (n = 12, 2 S.D.), irrespective of water depth or water mass. These results confirm that the isotopic composition of perrhenate (ReO4−) in seawater is uniform. The new data establish a baseline for evaluating the isotopic mass balance of Re, and for future assessments of whether this global cycle can be disturbed by changes in seafloor redox and/or global weathering rates.

中文翻译：

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大西洋海水的铼同位素组成

摘要 铼的浓度和同位素组成是从北大西洋百慕大大西洋时间序列研究初级站和南大西洋 40 oS UK GEOTRACES 探险队获得的海水样品中呈现的。两个位置的盐度归一化 Re 浓度范围在 50-5000 米深度之间约 6.8-7.7 ppt 之间，与先前公布的北大西洋和北太平洋的浓度数据一致。铼同位素值（相对于 NIST 3143 表示为 δ187/185Re）在平均值 -0.17 ± 0.12‰ (n = 12, 2 SD) 附近的变化很小，与水深或水质量无关。这些结果证实海水中高铼酸盐 (ReO4−) 的同位素组成是均匀的。