Varve and Radiocarbon Chronology and Geochemistry of the Holocene Black Sea: Evolution of an Anoxic Basin

黑海是现存的唯一一个相对较大的洋盆，其中包含大量厌氧深水。在过去的5-7Ky期间，沉积在较深水域中的沉积物是腐泥状到细碎片状的钙质沉积物。1988年黑海R/V KNORR为期21天的航程将审查沉积物中关于深水厌食症开始和扩大的时间的地球化学记录。这将通过对多达30个测站的箱形岩芯和大直径重力岩心进行综合研究来实现，这些站广泛覆盖了盆地深度。仔细收集和保存的岩心将使用各种摄影方法、核磁共振成像(NMRI)、显微密度测量、放射性碳测年等方法，为晚全新世黑海层序提供一个不同校准的时间尺度。将与其他研究人员合作综合这些结果，以解释缺氧对沉积物地球化学记录的影响以及伴随气候和海平面变化而产生的生产力和积累速率的变化；对VOLE记录的统计处理将产生1-1000年时间尺度上的准周期变化模式。所有这些推论对于解释古老的层状富含有机碳的地层都很重要。

The Black Sea is the only extant, relatively larger ocean basin that contains a substantial volume of anaerobic deep water. The sediments deposited in deeper water over perhaps the last 5-7 Ky are sapropelic to finely laminated and calcareous. 21-day leg of the R/V Knorr in the Black Sea in 1988 will provide an examination of the geochemical record in sediments of the timing of initiation and expansion of deep water anoia. This will be accomplished by an integrated study of box cores and large diameter gravity cores from as many as 30 stations with extensive coverage of the basin deeps. Carefully collected and preserved cores will provide a varve- calibrated timescale for the late Holocene Black Sea sequence using various photographic methods, NMRI (nuclear magnetic resonance imaging), microdensitometry, radiocarbon dating. The results will be synthesized, in cooperation with other researchers, for interpretation of the imprint of anoxia on the sediment geochemical record and the changes in productivity and accumulation rates that accompanied climate and sea level changes; statistical treatment of varve records will yield patterns of quasi-cyclic variations on timescales of 1-1000 years. All such inferences are important for interpretation of ancient laminated, organic-carbon rich strata.