tarium and Phosphorus Cycling in Marine Sediments: Mineral Phase Transformations and Burial in the S.E. Pacific

海洋沉积物中钍和磷的循环：东南部矿物相变和埋藏

• 批准号: 9617929
• 负责人: James McManus
• 金额: $ 24.78万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9617929&HistoricalAwards=false
• 关键词: tarium; Phosphorus; Cycling; Marine; Sediments

9617929 McManus This project will examine the effects of early diagenesis upon two elements (Ba and P) often used as tracers for past ocean production. The PIs hypothesize that Ba preservation is related to the degree of oxygen penetration into the sediment, and propose to use a redox sensitive element such as U as an independent tracer of sediment oxidation state. P preservation is hypothesized to be dependent upon both sediment oxidation and the presence of Fe oxides. The PIs will collect solid and fluid phases in sediment cores from the southeast Pacific and Chile continental margin spanning a wide range of oxidation states and sediment types. Species to be analyzed include Ba, P, U, Cd, SO4, C1, F, Mn, Fe, PO4, NH4, NO3 and O2.

小行星9617929 该项目将研究早期成岩作用对两种元素（钡和磷）的影响，这两种元素常被用作过去海洋生产的示踪剂。PI假设Ba保存与氧渗透到沉积物中的程度有关，并建议使用氧化还原敏感元素如U作为沉积物氧化态的独立示踪剂。P保存假设是依赖于沉积物氧化和铁氧化物的存在。项目研究员将收集东南太平洋和智利大陆边缘沉积物岩心中的固相和液相，涵盖各种氧化状态和沉积物类型。 待分析的物质包括Ba、P、U、Cd、SO4、Cl、F、Mn、Fe、PO4、NH4、NO3和O2。