A baseline for the Sn isotopic composition of the upper continental crust

IF 3.4 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochemical Perspectives Letters Pub Date : 2024-05-30 DOI:10.7185/geochemlet.2422

E. Kubik, F. Moynier, J.-X. She, R.L. Rudnick

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Abstract

We report high precision Sn isotopic compositions, expressed as δ^122/118Sn relative to the NIST3161a standard, for the fine grained matrix of 24 glacial diamictite composites. The diamictites were deposited from the Mesoarchean to the Palaeozoic and sampled from four continents (Africa, Asia, North and South America). They are relatively homogeneous in δ^122/118Sn, ranging from 0.15 to 0.32 ‰ with an average δ^122/118Sn value of 0.22 ± 0.14 ‰ (2 s.d., n = 24). The Sn isotopic composition of the diamictites is not influenced by chemical weathering, depositional age, geographic setting, atmospheric oxygen content or magmatic differentiation processes in the source region. As such, the average provides a robust estimate of the Sn isotopic composition of the bulk upper continental crust (UCC). This baseline is within the range of, but isotopically lighter than, the current depleted mantle estimate (0.37 ± 0.09 ‰; 2 s.d., n = 12) and bulk silicate Earth (0.38 ± 0.11 ‰; 2 s.d., n = 9). It also overlaps with the very few available measurements made on andesites, granites, a granodiorite and a rhyolite.

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大陆上地壳锡同位素组成基线

我们报告了24种冰川二长岩复合材料细粒基质的高精度锡同位素组成，相对于NIST3161a标准，用δ122/118Sn表示。这些二长岩沉积于中生代至古生代，取样于四大洲（非洲、亚洲、北美洲和南美洲）。它们的δ122/118Sn相对均匀，范围在 0.15 至 0.32 ‰ 之间，平均δ122/118Sn 值为 0.22 ± 0.14 ‰（2 s.d.，n = 24）。二长岩的锡同位素组成不受源区化学风化、沉积年龄、地理环境、大气含氧量或岩浆分异过程的影响。因此，该平均值为大块上大陆地壳（UCC）的锡同位素组成提供了可靠的估计值。该基线在当前贫化地幔估计值（0.37 ± 0.09 ‰；2 s.d.，n = 12）和大块硅酸盐地球（0.38 ± 0.11 ‰；2 s.d.，n = 9）的范围内，但同位素含量比后者轻。它还与对安山岩、花岗岩、花岗闪长岩和流纹岩进行的极少数测量结果重叠。

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来源期刊

Geochemical Perspectives Letters Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

7.00

自引率

2.00%

发文量

审稿时长

15 weeks

期刊介绍： Geochemical Perspectives Letters is an open access, internationally peer-reviewed journal of the European Association of Geochemistry (EAG) that publishes short, highest-quality articles spanning geochemical sciences. The journal aims at rapid publication of the most novel research in geochemistry with a focus on outstanding quality, international importance, originality, and stimulating new developments across the vast array of geochemical disciplines.