Distinct iron isotopic signatures and supply from marine sediment dissolution.
Distinct iron isotopic signatures and supply from marine sediment dissolution.
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DOI：
10.1038/ncomms3143
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发表时间：
2013
影响因子：
16.6
通讯作者：
Mills, Rachel A.
中科院分区：
文献类型：
--
作者：
Homoky, William B.;John, Seth G.;Conway, Tim M.;Mills, Rachel A.
必须对海洋铁投入进行追踪和量化，以了解它们如何影响初级生产力和气候。大陆边缘沉积物中铁的化学还原为海洋提供了大量的溶解通量，其同位素比地壳轻，因此海水中的铁可能与其他来源区分开来，如风吹来的粉尘。然而，在海水中测量到的重铁同位素最近导致了另一种溶解铁来源的命题，即大陆边缘的非还原溶解。在这里，我们提供了来自被动构造和半干旱海洋边缘(南非)的第一个孔隙水铁同位素数据，它揭示了与活动构造和缺氧大陆边缘相比，进入海水的溶解铁通量更小，同位素更重。这些数据提供了大陆边缘非还原铁溶解的现场证据，并进一步表明地质和水文气候因素可能影响进入海洋的铁的数量和同位素组成。海洋边缘沉积物中铁的溶解可能会刺激光合作用，缓和全球气候。这项研究揭示了边缘沉积物如何在不同地区之间以不同的数量和不同的机制提供铁，这可能是由于地质特征和陆地上的水文控制。
Oceanic iron inputs must be traced and quantified to learn how they affect primary productivity and climate. Chemical reduction of iron in continental margin sediments provides a substantial dissolved flux to the oceans, which is isotopically lighter than the crust, and so may be distinguished in seawater from other sources, such as wind-blown dust. However, heavy iron isotopes measured in seawater have recently led to the proposition of another source of dissolved iron from ‘non-reductive’ dissolution of continental margins. Here we present the first pore water iron isotope data from a passive-tectonic and semi-arid ocean margin (South Africa), which reveals a smaller and isotopically heavier flux of dissolved iron to seawater than active-tectonic and dysoxic continental margins. These data provide in situ evidence of non-reductive iron dissolution from a continental margin, and further show that geological and hydro-climatic factors may affect the amount and isotopic composition of iron entering the ocean. The dissolution of iron from sediments along ocean margins may stimulate photosynthesis and moderate global climate. This study shows how margin sediments supply iron in varying amounts between regions, and by distinct mechanisms, which may be due to geological characteristics and hydrological controls on land.
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影响因子：
5.3
作者：
Bergquist, B. A.;Boyle, E. A.
通讯作者：
Boyle, E. A.
影响因子：
5.3
作者：
Lacan, F;Jeandel, C
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作者：
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影响因子：
3.4
作者：
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通讯作者：
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