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

黑海是唯一现存的、相对较大的、含有大量厌氧深水的海洋盆地。沉积物沉积在较深的水域，可能在过去的5-7天，腐泥到细层状和钙质。1988年在黑海的R/V Knorr号的21天航次将对沉积物中的地球化学记录进行检查，以确定深水缺氧发生和扩展的时间。这将通过对多达30个站点的箱形岩心和大直径重力岩心进行综合研究来完成，这些站点广泛覆盖盆地深处。精心收集和保存的岩心将使用各种摄影方法、核磁共振成像（NMRI）、微密度测定法、放射性碳定年法，为全新世晚期黑海序列提供一个可变校准的时间尺度。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，以及随气候和海平面变化而发生的生产力和积累率的变化；对阀门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。所有这些推论对解释古代层状、富有机碳地层都很重要。

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.