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Iron In Earth Surface Systems, April 2011, Vol. 7, No. 2
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Iron is the fourth most abundant element at the Earth’s surface. As an essential nutrient and electron source/sink for the growth of microbial organisms, it is metabolically cycled between reduced and oxidized chemical forms.
Iron In Earth Surface Systems
April 2011, Vol. 7, No. 2
Iron is the fourth most abundant element at the Earth’s surface. As an essential nutrient and electron source/sink for the growth of microbial organisms, it is metabolically cycled between reduced and oxidized chemical forms. This flow of electrons is invariably tied to the reaction with other redox-sensitive elements, including oxygen, carbon, nitrogen, and sulfur. The end result of these interactions is that iron is intimately involved in the geochemistry, mineralogy, and petrology of modern aquatic systems and their associated sediments, particulates, and pore waters. In the geological past, vast iron sediments, the so-called banded iron formations, suggest that iron played an even greater role in marine geochemistry, and these deposits are now being used as proxies for understanding the chemical composition of the ancient oceans and atmosphere. This issue explores not only the modern expression of iron cycling but also its record in Earth’s history.
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