Phosphorous Diagenesis and Burial in Marine Sediments

海洋沉积物中磷的成岩作用和埋藏

• 批准号: 9101495
• 负责人: Kathleen Ruttenberg
• 金额: $ 18.51万
• 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: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9101495&HistoricalAwards=false
• 关键词: Phosphorous; Diagenesis; Burial; Marine; Sediments

Phosphorus is an essential nutrient for biological production in the ocean. Diagenetic processing and burial efficiency of P in marine sediments exert a major control on marine biogeochemical cycles. Over geologic time, the level of P in the ocean will be controlled to a large extent by its rate of burial in marine sediments. This is crucial to the development of realistic, predictive, biogeochemical models and to the interpretation of the sedimentary record. Detailed solid-phase p data, generated using a new selective sequential extraction (SEDEX) technique, will be collected for a diverse suite of typical marine environments and one river-estuary-delta system (the Mississippi). Phase s responsible for P retention by marine sediments will be identified by examining solid-phase P redistribution with depth in sediments in conjunction with pore water and other solid-phase data. This approach provides insight into the early diagenetic chemical reactions responsible for formation and preservation of these phases. Diagenetic modeling will be used to test interpretations made on the basis of solid-phase and pore water data and to draw further conclusions as to rates of the chemical processes inferred. Comparison of the quantity and chemical nature of solid-phase P to pore water gradients over fine-scale (mm) depth intervals near the sediment-water interface will permit quantification and characterization of P cycling and burial efficiency near this interface. The extent of biogeochemical processing of particulate P during transit across a particular continent-ocean interface will be quantified by comparing solid-phase P speciation in Mississippi River/Estuary suspended matter with that in associated deltaic sediments. Depositional environmental controls on P burial will be generated from which to construct a global marine P budget.

磷是生物生产所必需的营养元素 在海洋里 P的成岩作用和埋藏效率 在海洋沉积物中， 地球化学循环 在地质时期， 海洋将在很大程度上受到其流速的控制 埋藏在海洋沉积物中。 这对发展至关重要。 现实的，可预测的，地球化学模型， 沉积记录的解释。 详细固相 p数据，使用新的选择性顺序提取生成 （SEDEX）技术，将收集一套不同的 典型的海洋环境和一个河流-河口-三角洲系统 (the密西西比）。 负责P保留的阶段 海洋沉积物将通过检查固相P 沉积物中孔隙随深度的再分布 水和其他固相数据。 这种方法提供 对早期成岩化学反应的认识 负责这些阶段的形成和保存。 成岩建模将被用来测试解释 根据固相和孔隙水数据， 关于化学过程速率的进一步结论 推断。 化学性质的比较 细尺度（mm）上的固相P-孔隙水梯度 沉积物-水界面附近的深度间隔将允许 磷循环和埋藏的定量和表征 这个界面附近的效率。 地球化学的程度 在穿过特定的 大陆-海洋界面将通过比较 密西西比河/河口悬浮态固相磷形态 与相关三角洲沉积物中的物质有关。 沉积 将产生对P埋藏的环境控制， 构建全球海洋磷预算。