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Chemical, Biological and Hydrological Controls on the 14C Content of Cold Seep Carbonate Crusts: Numerical Modelling and Implications for Convection at Cold Seeps

Created 16/10/2025

Updated 16/10/2025

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Understanding the hydrology of cold seep environments is crucial to perform accurate estimates of fluid and chemical fluxes at sedimentary wedges. Shallow convection processes may affect fluid flux estimates and could favor the destabilization of gas hydrate accumulations, increasing the sediment-ocean methane flux. Evidence for the occurrence of convection at cold seeps, however, is still limited. We use the concentration of 14C (D14C) in carbonate crusts formed at cold seeps of the eastern Mediterranean Sea as a tracer for convective recirculation of seawater-derived fluids. A numerical model is applied to investigate the controls on 14C incorporation in cold seep carbonates. Our simulations show that increased amounts of CH4 in the expelled fluids result in elevated crust D14C, while high Ca2+ and HCO3 concentrations produce the opposite effect. Convection is the only transport process that can significantly increase crust D14C. Advection, bioirrigation, eddy diffusion and bioturbation instead, have little effect on, or produce a decrease of, crust D14C. In addition, the presence of old or modern carbon (MC) in host sediments prior to cementation and the 14C-decay associated to the time needed to form the crust contribute in defining the D14C of carbonate crusts. We then use the model to reproduce the 14C content of the eastern Mediterranean Sea crusts to constrain the chemical and hydrological conditions that led to their formation. Some crusts contain relatively low amounts of 14C (-945.0

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Title Chemical, Biological and Hydrological Controls on the 14C Content of Cold Seep Carbonate Crusts: Numerical Modelling and Implications for Convection at Cold Seeps
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/81d63fa9-6685-4a0d-ac99-0ff442a84081
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
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      ]
    ]
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Chemical, Biological and Hydrological Controls on the 14C Content of Cold Seep Carbonate Crusts: Numerical Modelling and Implications for Convection at Cold Seeps". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/chemical-biological-and-hydrological-controls-on-the-14c-content-of-cold-seep-carbonate-crusts-