Discussion
Low concentration of Fe in surface ocean waters after the Late Archaean may be linked to :
Answer: C
Low dissolved iron after the Late Archaean is linked to the Great oxidation event.
In the oxygen-poor Archaean ocean, iron stayed dissolved as ferrous iron (Fe2+). When free oxygen built up in the atmosphere and surface ocean during the Great Oxidation Event, about 2.4-2.3 billion years ago, ferrous iron was oxidised to insoluble ferric iron (Fe3+) and precipitated, contributing to the great banded iron formations and leaving surface waters poor in iron ever since.
Less volcanism or slower spreading would reduce the iron supply only modestly and do not explain the global change, and there is no recognised 'great carbon event' tied to it.
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