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

Published online by Cambridge University Press:  18 July 2016

Michel Fontugne ,
François Guichard ,
Ilham Bentaleb ,
Claudia Strechie  and
Gilles Lericolais
Michel Fontugne*
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement (UMR1572 CNRS/CEA/UVSQ), Domaine du CNRS, 91198 Gif sur Yvette cedex, France
François Guichard
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement (UMR1572 CNRS/CEA/UVSQ), Domaine du CNRS, 91198 Gif sur Yvette cedex, France
Ilham Bentaleb
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement (UMR1572 CNRS/CEA/UVSQ), Domaine du CNRS, 91198 Gif sur Yvette cedex, France Institut des Sciences de l'Evolution - Montpellier (I.S.E.-M.)
Claudia Strechie
Affiliation:
GeoEcoMar, National Institute for Marine Geology and Geo-ecology, Str. D. Onciul nr. 23–25, 024053 Bucharest, Romania
Gilles Lericolais
Affiliation:
IFREMER, Centre de Brest, DCB/GM - BP 70, F-29280 Plouzané cedex, France
*
Corresponding author. Email: [email protected]
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Abstract

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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 14C activity shows a weak contribution of the deep 14C-depleted CO2 to the photic zone. Such a distribution of 14C 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 14C-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 photosynthetic primary production could explain 14C reservoir ages greater than 1300 yr.

Type
Marine Studies
Information
Radiocarbon , Volume 51 , Issue 3 , 2009 , pp. 969 - 976
Copyright
Copyright © 2009 by the Arizona Board of Regents on behalf of the University of Arizona 

References

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