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过去20亿年里岛弧锶同位素与海水化学的时间协变关系。

Temporal covariation of island arc Sr isotopes and seawater chemistry over the past 2 billion years.

作者信息

Bednarick Amanda L, Bucholz Claire E, DePaolo Donald J, Stolper Daniel A

机构信息

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.

Department of Earth and Planetary Science, University of California, Berkeley, CA 94720.

出版信息

Proc Natl Acad Sci U S A. 2024 Oct 22;121(43):e2401832121. doi: 10.1073/pnas.2401832121. Epub 2024 Oct 15.

DOI:10.1073/pnas.2401832121
PMID:39405350
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11513961/
Abstract

The chemical compositions of island arc basalts (IAB) reflect contributions from the mantle as well as fluids and melts from the subducting slab. Addition of radiogenic seawater Sr to oceanic crust through hydrothermal alteration and subsequent subduction is often invoked to explain elevated Sr/Sr signatures in modern IAB. However, changes in the Sr/Sr of island arc magmatic rocks through time has not been investigated, limiting our understanding of the factors influencing the Sr budgets of arcs throughout Earth's history. To address this, we compiled Sr/Sr values from island arc magmatic rocks ranging in age from modern to Paleoproterozoic, only including data from island arc localities that best preserve initial magmatic Sr/Sr. Median initial Sr/Sr values are consistently elevated compared to depleted mantle Sr/Sr over this period, indicating persistent enrichment in radiogenic Sr in island arcs. Moreover, the elevation in island arc Sr/Sr relative to the depleted mantle is variable. A notable rise in island arc Sr/Sr during the late Neoproterozoic coincides with a steep increase in seawater Sr/Sr and Sr concentration. To investigate this potential connectivity, we modeled the Sr/Sr of island arc magmas between 0 and 830 Ma with inputs of depleted mantle Sr/Sr, seawater Sr/Sr, and seawater Sr concentration. The model reproduces the overall trajectory of the compiled data. We interpret the observed temporal variation in island arc Sr/Sr values and its close association with fluctuations in seawater chemistry as evidence that changes in marine geochemistry have strongly influenced the Sr isotopic record of island arc magmas over time.

摘要

岛弧玄武岩（IAB）的化学成分反映了地幔以及俯冲板块中的流体和熔体的贡献。通过热液蚀变将放射性海水锶添加到洋壳中，随后发生俯冲，这一过程常被用来解释现代IAB中锶/锶比值升高的现象。然而，岛弧岩浆岩的锶/锶比值随时间的变化尚未得到研究，这限制了我们对地球历史上影响岛弧锶预算的因素的理解。为了解决这个问题，我们汇编了从现代到古元古代不同年龄的岛弧岩浆岩的锶/锶值，只包括来自最能保留初始岩浆锶/锶值的岛弧地区的数据。在此期间，与亏损地幔的锶/锶值相比，初始锶/锶值的中位数持续升高，表明岛弧中放射性锶持续富集。此外，岛弧锶/锶相对于亏损地幔的升高是可变的。新元古代晚期岛弧锶/锶值的显著上升与海水锶/锶值和锶浓度的急剧增加相吻合。为了研究这种潜在的联系，我们用亏损地幔锶/锶值、海水锶/锶值和海水锶浓度作为输入，模拟了0至830 Ma之间岛弧岩浆的锶/锶值。该模型再现了汇编数据的总体轨迹。我们将观察到的岛弧锶/锶值的时间变化及其与海水化学波动的密切关联解释为海洋地球化学变化随时间强烈影响岛弧岩浆锶同位素记录的证据。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/992672d1cc7a/pnas.2401832121fig05.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/adf768045583/pnas.2401832121fig01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/51d14e857aa9/pnas.2401832121fig02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/de285e76f5d6/pnas.2401832121fig03.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/83a535ebed52/pnas.2401832121fig04.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/992672d1cc7a/pnas.2401832121fig05.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/adf768045583/pnas.2401832121fig01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/51d14e857aa9/pnas.2401832121fig02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/de285e76f5d6/pnas.2401832121fig03.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/83a535ebed52/pnas.2401832121fig04.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2232/11513961/992672d1cc7a/pnas.2401832121fig05.jpg

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本文引用的文献

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An alternative to the igneous crust fluid + sediment melt paradigm for arc lava geochemistry.一种替代火成岩地壳流体+沉积物熔体范式的弧岩浆地球化学观点。
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