Journal
NATURE COMMUNICATIONS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms3143
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Funding
- UK Natural Environment Research Council [NE/F017197/1, NE/H004394/1]
- US National Science Foundation [OCE-1131387]
- Natural Environment Research Council [NE/H004394/1, NE/F017197/1, NE/K009532/1] Funding Source: researchfish
- NERC [NE/F017197/1, NE/H004394/1, NE/K009532/1] Funding Source: UKRI
- Division Of Ocean Sciences
- Directorate For Geosciences [1131387] Funding Source: National Science Foundation
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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.
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