Authigenic Minerals Drive Upper-Ocean Iron Cycle

Authigenic mineral phases have been identified as a significant driver of the upper-ocean iron cycle, according to an author correction published in Nature on July 10, 2026. This research highlights the crucial role these minerals play in regulating iron availability in marine environments, which has far-reaching implications for primary productivity and the global carbon cycle.

The study, which revises previous understandings, emphasizes that the formation and dissolution of authigenic minerals directly influence the cycling of dissolved iron. Dissolved iron is a vital micronutrient for phytoplankton, the base of marine food webs, and its availability can limit primary production in large areas of the ocean, particularly in high-nutrient, low-chlorophyll (HNLC) regions. The iron cycle is therefore intrinsically linked to the ocean's capacity to absorb atmospheric carbon dioxide.

Authigenic minerals are those that precipitate directly from seawater. Their formation can sequester dissolved iron from the water column, while their subsequent dissolution can release iron back into the ocean. The correction clarifies the specific mineral phases involved and their rates of formation and degradation, providing a more accurate model of iron biogeochemistry. This detailed understanding is essential for refining climate models that incorporate oceanic processes.

The findings contribute to a more comprehensive understanding of marine biogeochemical cycles and their sensitivity to environmental changes. By pinpointing authigenic mineral phases as a key control on iron availability, scientists can better predict how changes in ocean chemistry, temperature, and circulation might affect marine ecosystems and their role in regulating Earth's climate. Further research is expected to build upon these insights to explore the broader impacts on marine biodiversity and fisheries.