Sedimentation of Reduced Sulfur in the Black Sea

黑海中还原硫的沉积

• 批准号: 8614462
• 负责人: John Cisne
• 金额: $ 5万
• 依托单位: Cornell University
• 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: 1987-11-15 至 1990-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8614462&HistoricalAwards=false
• 关键词: Sedimentation; Reduced; Sulfur; Black; Sea

This award focuses on the processes of sedimentation of reduced sulfur compounds in the Black Sea, with particular emphasis on determining whether a significant flux of particulate reduced sulfur and iron compounds is occurring in the present-day anoxic water column. This work is part of the 1987 Black Sea Cruise. The objectives are as follows: 1) Compare the relative sizes of the "reservoirs" of different particulate reduced-sulfur compounds such as pyrite, iron monosulfides, and elemental sulfur; 2) Determine where different sulfur phases occur in the Black Sea--at the oxic- anoxic interface, in the anoxic water column, the sediment- water interface, and in bottom sediments; 3) Compare spatial and temporal changes in sulfur and iron flux to such variation in other sedimentary flux components; 4) Determine whether metal adsorption onto particles such as clays or cellular matter occurs, whether sulfides form on such particles in the anoxic zone, and whether their contribution to the flux is significant; 5) Search for other trace metals or metal sulfides which may form in anoxic water. This work will involve analyses of sediment trap material, sediment cores, and suspended particulate matter from water samples, using techniques developed for determining the kinds and amounts of reduced sulfur and iron compounds present, as well as determining whether these are associated with fluxes of other particulate materials. The results of this study will contribute to understanding the processes of metal sulfide formation, transport and sedimentation in anoxic environments.

该奖项的重点是黑海还原硫化合物的沉积过程，特别强调确定当今缺氧水柱中是否存在大量还原硫和铁化合物颗粒。 该作品是1987年黑海巡航的一部分。 目标如下： 1) 比较不同颗粒状还原硫化合物（例如黄铁矿、一硫化铁和元素硫）的“储库”的相对大小； 2) 确定黑海中不同硫相出现的位置——缺氧-缺氧界面、缺氧水体、沉积物-水界面以及底部沉积物； 3）将硫和铁通量的空间和时间变化与其他沉积通量成分的变化进行比较； 4) 确定是否发生金属吸附到粘土或细胞物质等颗粒上，缺氧区中这些颗粒上是否形成硫化物，以及它们对通量的贡献是否显着； 5) 寻找缺氧水中可能形成的其他微量金属或金属硫化物。 这项工作将涉及对水样中的沉积物捕集材料、沉积物核心和悬浮颗粒物进行分析，使用为确定存在的还原硫和铁化合物的种类和数量而开发的技术，以及确定这些是否与其他颗粒材料的通量相关。 这项研究的结果将有助于了解缺氧环境中金属硫化物的形成、运输和沉积过程。