Oxygen Isotope Geochemistry of Marine Sulfate

海洋硫酸盐的氧同位素地球化学

• 批准号: 0452329
• 负责人: Daniel Schrag
• 金额: $ 30.07万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452329&HistoricalAwards=false
• 关键词: Oxygen; Isotope; Geochemistry; Marine; Sulfate

The PI has developed an analytical technique for delta 18O of sulfate, based on barite delta 18O analyses. The main focus of the study will be to use the delta 18O of barite as a recorder for the d18O of seawater sulfate through the last 100 m.y., with particular attention to anoxic events in the mid-Cretaceous, with additional attention to the Permian-Triassic boundary. Effort will also be devoted to two related projects: studies of the delta 18O of dissolved sulfate in modern pore waters to better understand the factors that control the delta 18O of sulfate, and a comparison of the delta 18O values of barite and the trace sulfate in biogenic carbonates. Together these objectives will provide an improvement in our understanding of the global sulfur cycle and its interactions with the Earth's carbon and oxygen cycles.This research has the potential to broaden our understanding of carbon and sulfur cycles over Earth's history. The research will result in training of a post-doctoral scientist and a graduate student. The work will also serve as a basis for creating stronger interactions between geochemists and microbiologists at Harvard.

PI开发了一种基于重晶石δ 18 O分析的硫酸盐δ 18 O分析技术。这项研究的主要重点是使用重晶石的δ 18 O作为过去1亿年海水硫酸盐d18 O的记录器，特别关注白垩纪中期的缺氧事件，并额外关注二叠纪-三叠纪界线。还将致力于两个相关项目：研究现代孔隙沃茨中溶解硫酸盐的δ 18 O，以更好地了解控制硫酸盐δ 18 O的因素，以及比较重晶石的δ 18 O值和生物碳酸盐中的痕量硫酸盐。这些目标将提高我们对全球硫循环及其与地球碳和氧循环相互作用的理解。这项研究有可能拓宽我们对地球历史上碳和硫循环的理解。这项研究将培养一名博士后科学家和一名研究生。这项工作也将作为在哈佛的地球化学家和微生物学家之间建立更强相互作用的基础。