Black sea chemocline oscillations during the Holocene: Molecular and isotopic studies of marginal sediments

Yongsong Huang, Katherine H. Freeman, Richard T. Wilkin, Michael A. Arthur, A. Daniel Jones

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Pages (from-to)1525-1531
Number of pages7
JournalOrganic Geochemistry
Volume31
Issue number12
DOIs
StatePublished - Dec 1 2000

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All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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