The Fate of Molybdenum and Its Isotopes in Deep Marine, Oxide-Rich Sediments: Implications for the Mo Isotope Paleoproxy

深海富含氧化物沉积物中钼及其同位素的命运：对钼同位素古代理的影响

• 批准号: 1234778
• 负责人: Natascha Riedinger
• 金额: $ 17.96万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1234778&HistoricalAwards=false
• 关键词: Fate; Molybdenum; Its; Isotopes; Deep

Molybdenum (Mo) isotopes have the potential to act as tracers of past ocean anoxia. However, to validate the application of Mo as a proxy, a better understanding of the diagenetic processes affecting its isotopic composition in deep marine sediments is necessary. This research will examine the coupled cycling of Mo and manganese with sulfur, carbon, and iron in sediments underlying deep oxic waters, the effect of which on Mo isotope composition (and thus its validity as a proxy) is currently unknown. Major and trace elements in a set of modern sediment samples and associated pore waters will be analyzed to investigate potential Mo sinks, diagenetic pathways, and mechanisms for release into the overlying seawater. The outcome of this work will have important implications for the reliability of Mo as a tool for understanding past ocean conditions. Funding will support a female beginning investigator at the University of California- Riverside. A German doctoral student from the Alfred Wegner Institute will join the project for two months, strengthening international collaborative ties. Two undergraduates from UCR will also be trained. Results will be shared with industry collaborators in Uruguay through a series of lectures.

钼（Mo）同位素有可能作为过去海洋缺氧的示踪剂。然而，为了验证Mo作为代用物的应用，有必要更好地了解深海沉积物中影响其同位素组成的成岩过程。本研究将研究深氧水域下沉积物中Mo和锰与硫、碳和铁的耦合循环，其对Mo同位素组成的影响（因此其作为代理的有效性）目前尚不清楚。本文将分析一系列现代沉积物样品和相关孔隙水中的主要元素和微量元素，以研究潜在的Mo汇、成岩途径和释放到上覆海水中的机制。这项工作的结果将对Mo作为了解过去海洋条件的工具的可靠性具有重要意义。资金将支持加州大学河滨分校的一名女性初级研究员。阿尔弗雷德·韦格纳研究所的一名德国博士生将加入该项目，为期两个月，加强国际合作关系。UCR的两名本科生也将接受培训。结果将通过一系列讲座与乌拉圭的工业合作者分享。