铁同位素揭示了大洋缺氧事件 2(OAE 2 ∼ 94 Ma)期间的火山生成输入量

IF 4.5 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Lucien Nana Yobo, Helen M. Williams, Alan D. Brandon, Chris Holmden, Kimberly V. Lau, Steven C. Bergman, James S. Eldrett, Daniel Minisini
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引用次数: 0

摘要

在大洋缺氧事件 2(OAE 2)期间沉积的海洋碳酸盐中记录了异常高的金属浓度,包括铁富集。这些金属富集被归因于一个或多个大型火成岩带形成过程中的大规模海底喷发(热液假说),或归因于 OAE 2 期间暂时冷却期间以前缺氧的海洋沉积物重新氧化释放出的金属(沉积物释放假说)。在这里,我们利用铁稳定同位素来帮助区分这两种假说,即德克萨斯州西内海道 Iona-1 岩芯中 OAE 2 期间的痕量金属富集区间。我们的结果显示,在 OAE 2 期间出现了两级负偏移,这与在同一岩芯中测量到的锇同位素火山代用指标相吻合,负值峰值集中在痕量金属富集区间。在对研究环境中的碎屑铁和本地提供的铁进行校正后,远程提供的铁δ56Fe值为-0.28 ± 0.05 ‰,处于现代热液羽流中观察到的铁δ56Fe值范围(-0.1 至 -0.5‰)内,因此支持热液假说,即研究岩心在 OAE 2 期间富集的铁和其他相关痕量金属的来源。相比之下,沉积物释放假说预测的δ56Fe值要低得多,在-1.0‰至-3.3‰之间,预测底栖供应的铁来自缺氧海洋沉积物上覆的复氧底层水。这项研究表明,将铁与环境变化的其他代用指标(尤其是海底火山活动)结合起来,可以将热液提供的铁与尘埃、河流和陆架沉积物提供的铁区分开来,尽管铁的循环很复杂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Iron Isotopes reveal volcanogenic input during Oceanic Anoxic Event 2 (OAE 2 ∼ 94 Ma)
Anomalously high metal concentrations including iron enrichments are recorded in marine carbonates deposited during Ocean Anoxic Event 2 (OAE 2). These metal enrichments have been attributed to massive submarine eruptions during the formation of one or more large igneous provinces, the proposed trigger for OAE 2 (hydrothermal hypothesis), or to the release of metals from the reoxidation of formerly anoxic marine sediment during a period of temporary cooling during OAE 2 (sediment release hypothesis). Here we use iron stable isotopes to help distinguish between the two hypotheses for a trace metal enriched interval during OAE 2 in the Iona-1 core in the Western Interior Seaway, Texas. Our results show a two-step negative excursion during OAE 2 that is coincident with osmium isotope volcanic proxies measured in the same core, with peak negative values centered on a trace metal-enriched interval. After corrections for detrital and locally supplied iron to the study setting, the δ56Fe value of the remotely supplied iron is –0.28 ± 0.05 ‰, falling in the range of iron δ56Fe values observed in modern hydrothermal plumes (–0.1 to –0.5 ‰), thus supporting the hydrothermal hypothesis as the source of iron and other associated trace metals enriched in the study core during OAE 2. By contrast, the sediment release hypothesis predicts much lower δ56Fe values, between –1.0 ‰ to –3.3 ‰ predicted for benthic supplies of iron from anoxic marine sediment overlying re-oxygenated bottom waters. This study shows that combining iron with other proxies for environmental change, particularly submarine volcanism, can distinguish hydrothermally supplied iron from dust, rivers, and shelf sediment supplies of iron despite iron’s reputation for complicated cycling.
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来源期刊
Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta 地学-地球化学与地球物理
CiteScore
9.60
自引率
14.00%
发文量
437
审稿时长
6 months
期刊介绍: Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.
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