Oxygen Isotope Geochemistry of Marine Sulfate

在重晶石三角洲18O分析的基础上，PI开发了一种硫酸盐三角洲18O的分析技术。这项研究的主要重点将是利用重晶石的18O三角洲作为海水硫酸盐D18O的记录器，特别注意白垩纪中期的缺氧事件，另外还注意二叠系-三叠系的界线。还将致力于两个相关项目：研究现代孔隙水中溶解硫酸盐的三角洲18O，以更好地了解控制硫酸盐三角洲18O的因素，以及比较重晶石和生物成因碳酸盐中微量硫酸盐的三角洲18O值。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的相互作用的理解。这项研究有可能扩大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。这项工作还将成为哈佛大学地球化学家和微生物学家之间建立更强互动的基础。

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.