Abstract
Early diagenesis affects the distribution of solutes and minerals in unconsolidated sediments. The investigation of diagenesis is critical to understanding the geochemical transformation and benthic fluxes of elements. During the cruise mission SO-177 in 2004, gravity coring samples were recovered in the Haiyang 4 Area of the northern slope of the South China Sea (SCS). The geochemical concentrations in interstitial water were determined onboard. The 1D C.CANDI reactive transport software was used to model the early diagenesis processes at four sites: 56-GC-3, 70-GC-9, 94-GC-11, and 118-GC-13. All of the simulations reproduced concentration profiles that matched the measurements with the implemented geochemical reactions. The degradation of organic carbon and anaerobic oxidation of methane (AOM) primarily determine the distribution of solutes in the working area. The degradation is active in the top 150 cm, and AOM is vigorous at depths below 200 cm. The local advective flux, sediment rate, and kinetic reaction constants of organic matter, methane and sulfate were calibrated based on the existing concentrations of pore water solutes. Geochemical reactions in this area occur in considerably deeper layers compared to depths cited in the literature. The model results provide evidence for the existence of deep hydrocarbon reservoirs that provide methane to the upper sediments.
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Acknowledgements
This work has been financially supported by the National Natural Science Foundation of China (General Program No.41376076). Authors are grateful for the Natural Science Foundation of Guangdong Province (2015A030313718) and the External Cooperation Program of the Chinese Academy of Sciences (GJHZ1404) is also acknowledged.
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Liu, L., Luff, R., Shao, H. et al. Numerical modeling of early diagenetic processes in Haiyang 4 Area in the northern slope of the South China Sea. Environ Earth Sci 76, 453 (2017). https://doi.org/10.1007/s12665-017-6784-5
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DOI: https://doi.org/10.1007/s12665-017-6784-5