主要观点总结
本文研究了纳米比亚泥带沿两条横贯线路的铁氧化还原穿梭和吸收情况,探讨了不同地理和季节条件下铁的吸收机制。
关键观点总结
关键观点1: 海洋沉积物中的铁氧化还原穿梭对海洋中铁的生物可利用性具有重要意义。
在缺氧的底部水域与含铁表层沉积物接触的地方,观察到最高的沉积铁流量。
关键观点2: 在缺氧至硫化氢的南部夏季,纳米比亚泥带铁穿梭吸收显著,表现出较大的铁流量。
铁源区域与铁汇区域有明显的区分,显示出铁氧化还原穿梭与反应铁耗尽和富集之间的横向模式。
关键观点3: 沉积铁的吸收与粘土矿物的形成有关。
研究表明,频繁的红氧化合振荡和沉积物混合有助于粘土矿物对铁的吸收,防止硫化亚铁矿物的保存,并促进铁和钾在粘土矿物中的固定。
文章预览
不太好翻译,直接用英文吧,强调了粘土矿物对活性铁的吸收。 Title : Iron redox shuttling and uptake by silicate minerals on the Namibian mud belt Journal : Geochimica et Cosmochimica Acta Authors : Paul Vosteen, Michael Kossack, Christoph Vogt, Chloe H. Andersen, Sonja Geilert, Matthias Zabel, Florian Scholz Abstract : Anoxic marine sediments represent an important source of bioavailable iron (Fe) to the ocean. The highest sedimentary Fe fluxes are observed in open-marine oxygen minimum zones where anoxic bottom waters are in contact with ferruginous surface sediments. Here, sedimentary Fe release, transport and re-deposition (i.e., Fe shuttling) may generate a lateral pattern of sedimentary Fe enrichment and depletion, which can be used to trace redox-related Fe mobility in the paleo-record. However, depending on the balance between terrigenous and authigenic (i.e., shuttle-related) Fe flux, the stability of bottom water redox conditions as well as post-deposi
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