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-depositional processes of mineral alteration, the sedimentary fingerprint of an Fe redox shuttle may be obscured and difficult to identify.

中文翻译：

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纳米比亚泥浆带上硅酸盐矿物的铁氧化还原穿梭和吸收


缺氧海洋沉积物是海洋生物可利用铁 （Fe） 的重要来源。在缺氧的底层水与含铁表面沉积物接触的开阔海洋最低氧区观察到最高的沉积铁通量。在这里，沉积铁的释放、传输和再沉积（即铁穿梭）可能产生沉积铁富集和耗竭的横向模式，可用于追踪古记录中与氧化还原相关的铁迁移率。然而，根据陆源和自生（即与穿梭相关）Fe 通量之间的平衡、底层水氧化还原条件的稳定性以及矿物蚀变的沉积后过程，Fe 氧化还原穿梭的沉积指纹可能被模糊且难以识别。