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

Varve 和全新世黑海沉积物的放射性碳年代学和地球化学：缺氧盆地的演化

• 批准号: 8712181
• 负责人: Glenn Jones
• 金额: $ 14.15万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-12-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8712181&HistoricalAwards=false
• 关键词: Varve; Radiocarbon; Chronology; Geochemistry; Holocene

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.

黑海是唯一现存的，相对较大的海洋 含有大量厌氧深水的盆地。 在过去的5-7年里， Ky为腐泥质至细层状和钙质。 21天的腿 1988年在黑海的R/V Knorr将提供一个 沉积物中地球化学记录的检验 深水阿诺亚症的发生和扩展。 这将是 通过对箱形岩心和大型岩心的综合研究， 多达30个测站的直径重力岩心， 盆地深度的覆盖范围。 精心收集和保存 核心将提供一个varve校准的时间尺度为晚 全新世黑海序列使用各种摄影方法， NMRI（核磁共振成像），显微密度测定， 放射性碳年代测定法 将与其他机构合作， 研究人员，解释缺氧的印记， 沉积物地球化学记录和生产力的变化， 随着气候和海平面的变化， 变化;纹状记录的统计处理将产生 1-1000时间尺度上的准周期变化模式 年 所有这些推论对于解释 古老的富含有机碳的层状地层