Variations in 14 C Reservoir Ages of Black Sea Waters and Sedimentary Organic Carbon During Anoxic Periods: Influence of Photosynthetic Versus Chemoautotrophic Production - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Radiocarbon Année : 2009

Variations in 14 C Reservoir Ages of Black Sea Waters and Sedimentary Organic Carbon During Anoxic Periods: Influence of Photosynthetic Versus Chemoautotrophic Production

Résumé

Radiocarbon activity of dissolved inorganic carbon has been measured in the northwestern Black Sea. Both continental shelf and open-sea profiles show that surface waters are in equilibrium with the atmosphere. The observed distribution of 14 C activity shows a weak contribution of the deep 14 C-depleted CO 2 to the photic zone. Such a distribution of 14 C within the water column is unable to explain the aging of sedimentary organic matter and reservoir ages greater than 500 yr. A contribution of production by chemoautotrophic bacteria feeding on 14 C-depleted methane at the boundary of the oxic and anoxic zones is a realistic hypothesis. Also, a contribution to sedimentary organic carbon estimated at <15% of the photosyn-thetic primary production could explain 14 C reservoir ages greater than 1300 yr.
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Dates et versions

hal-02473350 , version 1 (30-10-2020)

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Michel Fontugne, François Guichard, Ilham Bentaleb, Claudia Strechie, Gilles Lericolais. Variations in 14 C Reservoir Ages of Black Sea Waters and Sedimentary Organic Carbon During Anoxic Periods: Influence of Photosynthetic Versus Chemoautotrophic Production. Radiocarbon, 2009, 51 (3), pp.969-976. ⟨10.1017/S0033822200034044⟩. ⟨hal-02473350⟩
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