What are the sources and mechanisms of iron enrichments during oceanic anoxic event 2? - Evidence from iron stable isotopes

海洋缺氧事件2期间铁富集的来源和机制是什么？

• 批准号: 0929383
• 负责人: Silke Severmann
• 金额: $ 14.97万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0929383&HistoricalAwards=false
• 关键词: What; sources; mechanisms; iron; enrichments; What; sources; mechanisms; iron; enrichments

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This project will investigate the paleo-geological history of Ocean Anoxic Event II (OAEII, ~94 Ma) by iron isotopic analyses (d56Fe) of total iron in archived sediment cores from the proto North Atlantic and bordering Western Interior Seaway, including several from DSDP and ODP. OAEII sediments are characterized by concentrations of high organic carbon (OC) which might have resulted either from 1) increased preservation of OC resulting from more anoxic conditions globally, or 2) increased surface ocean productivity. The effects of iron on ocean productivity and the overall carbon cycle during OAEII is a major aim of this research. To this end, the research will investigate the relative inputs of Fe to euxinic sediments from hydrothermal inputs versus that remobilized from shelf sediments that should carry a distinctly lower d56Fe value than the hydrothermal source. The d56Fe values and FeT/Al ratios of sedimentary iron in euxinic sediments of OAEII will reflect the relative contribution from hydrothermal sources. This research will try to constrain the overall mass balance of iron in the ocean during OAEII and thus expand the use of Fe isotopic analyses for paleo-environmental assessment.Broader impacts: The research supports an undergraduate student, a postdoc, and an early career female scientist. As part of the Center for Ocean Science Education Excellence at Rutgers University, the PI will work with the Center?s Director to incorporate the research results into online educational materials directed at K-12 teachers, K -16 students, and coastal managers.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。该项目将通过铁同位素分析（D56FE）在原始的北大西洋和西部内部海道接壤的归档沉积物核中，调查海洋缺氧事件II（OAEII，〜94 MA）的古生物地质历史（OAEII，〜94 MA），包括来自DSDP和ODP的几个。 OAEII沉积物的特征是高有机碳（OC）的浓度，这可能是由于1）增加了由全球缺氧条件更大的OC保存增加，或者2）提高了表面海洋生产率。铁对OAEII期间海洋生产率和整体碳循环的影响是这项研究的主要目的。为此，研究将研究来自水热输入的Fe对e丁质沉积物的相对输入，而不是从架子沉积物中重新计算的，这些沉积物应具有明显低于水热源的D56FE值。 OAEII的euxinic型沉积物中沉积铁的D56FE值和FET/Al比率将反映出水热来源的相对贡献。这项研究将试图限制OAEII期间海洋中铁的总体质量平衡，从而扩大对古环境评估的Fe同位素分析的使用。Broader的影响：该研究支持本科生，博士后和早期职业女性科学家。作为罗格斯大学海洋科学教育中心卓越中心的一部分，PI将与该中心的主任合作，将研究结果纳入针对K -12教师，K -16学生和沿海经理的在线教育材料。