Geopolymerization threatens the persistence of organic carbon associated with iron in anoxic environments

Cheng Zhao, Yingxun Du, Hongwei Wang, Wenjie Zhou, Fan Xun, Shun Liu, Biao Li, Xiancai Lu, Qinglong L. Wu, Ke-Qing Xiao () and Peng Xing ()
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Cheng Zhao: Chinese Academy of Sciences
Yingxun Du: Chinese Academy of Sciences
Hongwei Wang: Chinese Academy of Sciences
Wenjie Zhou: Chinese Academy of Sciences
Fan Xun: Chinese Academy of Sciences
Shun Liu: Lanzhou University
Biao Li: Chinese Academy of Sciences
Xiancai Lu: Nanjing University
Qinglong L. Wu: Chinese Academy of Sciences
Ke-Qing Xiao: University of Chinese Academy of Sciences
Peng Xing: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The sequestration of organic carbon (OC) through mineral association in soils and sediments is a crucial process that regulates carbon sink dynamics and the global carbon cycle. However, minerals can participate in both abiotic and biotic OC transformations, altering the persistence of mineral-associated OC under anoxic conditions. In this work, we report that synergistic interactions among metal (oxyhydr)oxides, such as iron (Fe), manganese (Mn), and aluminum (Al) drive the polymerization of simple organic molecules into macromolecular geopolymers, increasing their electron transfer capacity by 52–115%. These geopolymers function as electron shuttles, enhancing OC decomposition through microbial dissimilatory iron reduction. This reduces the mean retention time (MRT) of OC bound to active and inert Fe minerals by 51.4 ± 15.6% and 74.1 ± 13.7%, respectively. Future carbon turnover models should explicitly account for the mineral composition, redox fluctuations, and microbial metabolic pathways to advance the understanding of the Earth’s carbon sink.

Date: 2025
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DOI: 10.1038/s41467-025-62016-1

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