Black Sea chemocline oscillations during the Holocene: molecular and isotopic studies of marginal sediments |
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| Authors: | Yongsong Huang Katherine H Freeman Richard T Wilkin Michael A Arthur A Daniel Jones |
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| Institution: | a Department of Geosciences, The Pennsylvania State University, University Park, PA 16802 USA;b Department of Geological Sciences, Brown University, Providence, RI 02912, USA;c Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | We measured δ13C values of free and sulfur-bound lipids and framboidal pyrite-size distributions in three sediment cores from the southern margins of the Black Sea. The margin cores show a marked difference in the occurrence of biomarkers from green sulfur bacteria compared with the deep-basin cores, as a result of deepening of the chemocline resulting from enhanced mixing and/or decreased light-penetration as a consequence of high turbidity and productivity in shelf waters. Quantitation of biomarkers suggests that photic-zone anoxia along the shelf margin was generally absent during the deposition of unit I, although occurred during the deposition of Unit IIb at two sites. |
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| Keywords: | Black Sea Chemocline Southern margin Photic zone anoxia |
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