Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf

Jaewoo Jung, Kyu-Cheul Yoo, Brad E. Rosenheim, Tim M. Conway, Jae Il Lee, Ho Il Yoon, Chung Yeon Hwang, Kiho Yang, Christina Subt and Jinwook Kim ()
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Jaewoo Jung: Yonsei University
Kyu-Cheul Yoo: Korea Polar Research Institute
Brad E. Rosenheim: University of South Florida
Tim M. Conway: University of South Florida
Jae Il Lee: Korea Polar Research Institute
Ho Il Yoon: Korea Polar Research Institute
Chung Yeon Hwang: Korea Polar Research Institute
Kiho Yang: Yonsei University
Christina Subt: University of South Florida
Jinwook Kim: Yonsei University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe2+ to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When sediments are underneath the ice shelf, Fe2+ from microbial reductive dissolution of illite/Fe-oxides may be exported to the water column. However, the initiation of an oxygenated, bioturbated sediment under receding ice shelves may oxidize Fe within surface porewaters, decreasing dissolved Fe2+ export to the ocean. Thus, we identify another ice-sheet feedback intimately tied to iron biogeochemistry during climate transitions. Further constraints on the geographical extent of this process will impact our understanding of iron-carbon feedbacks during major deglaciations.

Date: 2019
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DOI: 10.1038/s41467-019-13741-x

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