The Effect of Organic Carbon-Iron Oxide Association on the Preservation of Sedimentary Organic Carbon in Marine Environments |
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| Authors: | Zhao Bin Yao Peng Yu Zhigang |
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| Institution: | 1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education,Qingdao 266100,China; 2.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; 3.Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory forMarine Science and Technology, Qingdao 266237, China |
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| Abstract: | Understanding the mechanisms responsible for long-term storage of organic carbon (OC) in marine environment is important for studying the marine carbon cycling and predicting how the global carbon cycle will respond to climate change. It is estimated that more than 20% of the OC in marine sediments is associated with iron oxides and thus these complexes are one of the most important factors in the long-term storage of OC. The OC-iron oxide (OC-Fe) association can be formed through either adsorption or co-precipitation, but the dominant mechanism of OC-Fe association in marine environments is co-precipitation. The combination of OC from different sources with iron oxides is selective. Iron oxides preferentially combine with marine OC in most marine environments, but in estuarine delta regions they prefer terrestrial OC. Due to large inputs of terrestrial materials, high primary production and frequent re-suspension, estuarine and marginal seas are suitable sites for OC-Fe association studies, which should be emphasized in the future. |
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| Keywords: | Sedimentary organic carbon Preservation Iron oxide Carbon cycling Complexation |
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