冰作为地球化学反应器

Freezing redirects the fate of iron in Earth’s cryosphere Kevin M. Rosso I ron is one of the most abundant elements in Earth’s crust and an essential metal for most organisms. Weathering breaks down rocks and releases iron, which then forms secondary iron min- erals by reacting with oxygen and water. These iron oxides are broadly distributed on land as rust-red coatings on rocks and fine particles in soils, in aquatic environments, and in the atmosphere. Iron cycling on Earth’s surface is critical for the mineral uptake into living systems. Moreover, the isotopic composition of some iron- containing minerals has long been regarded as a proxy for reconstruct- ing climatic and oxygenation conditions present in Earth’s early history. …