Collaborative Research: Unlocking the Cenozoic/Cretaceous seawater sulfate record via inclusion of 17O in marine barite

合作研究：通过海洋重晶石中的 17O 来解锁新生代/白垩纪海水硫酸盐记录

• 批准号: 1946137
• 负责人: David Johnston
• 金额: $ 41.34万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-01-15 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1946137&HistoricalAwards=false
• 关键词: Collaborative; Research; Unlocking; Cenozoic; Cretaceous; Collaborative; Research; Unlocking; Cenozoic; Cretaceous

The PIs will measure a never-before-analyzed chemical property of ocean sediments – variations in two trace isotopes of oxygen in barium sulfate particles. These data will provide a record of changes in ocean chemistry over the last 125 million years, changes that are driven by variations in the Earth’s carbon, oxygen and sulfur cycles. Understanding the history of the global cycles of these elements (carbon, oxygen, and sulfur) will help us understand the links between geological processes, natural climate change, and biological processes on land and in the ocean. Activities also include public outreach (via cartoon modules described the science), and the project will support training of a graduate student.This project will build a record of the 17O in sulfate from marine barite over the last 125 million years, using a recently-developed method that enables high-precision analysis of 17O in barite. The chemistry of marine sediments stands as one of the central catalogs of climatic evolution and earth surface change on geological timescales. The sulfur and oxygen isotopic composition of marine sulfate (as captured in barite) are two key records ocean chemistry over the last 125 million years. They are important because sulfate serves as an energy source for microbial life that is roughly 10 times larger than atmospheric oxygen, and that integrates across a wide range of biogeochemical processes and cycles, including those of carbon and iron. Recently, a new hypothesis was generated involving the influence of large igneous province formation on the sulfur isotope record. The new data proposed here – 17O in barite – will be used to test this hypothesis, and more broadly, to better understand the C, S, and O cycles through the Cretaceous and Cenozoic.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

PI将测量海洋沉积物的无分析化学特性 - 硫酸钡颗粒中氧的两个痕量同位素的变化。这些数据将在过去的1.25亿年中提供海洋化学变化的记录，这是由于地球，氧气和硫循环的变化所驱动的。了解这些元素的全球周期的历史（碳，氧气和硫）将有助于我们了解地质过程，自然气候变化以及土地和海洋中的生物过程之间的联系。活动还包括公共宣传（通过卡通模块描述了科学），该项目将支持研究生的培训。在过去的1.25亿年中，该项目将使用最近开发的方法在过去的1.25亿年中创建17O的硫酸盐中的记录，该方法能够对Barite进行高精度分析。海洋沉积物的化学是气候进化的中心目录之一，地质时间尺度上的地面变化。在过去的1.25亿年中，海洋硫酸盐的硫和氧同位素组成是海洋化学的两个关键记录。它们很重要，因为硫酸盐是微生物寿命的能源，大约比大气中的氧气大10倍，并且在各种生物地球化学过程和周期中都集成了大气中的氧气，包括碳和铁的生物地球化学过程和周期。最近，产生了一个新的假设，涉及大火成岩地层对硫同位素记录的影响。此处提出的新数据（17o in Barite）将用于检验这一假设，更广泛地通过白垩纪和新生代更好地理解C，S和O周期。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子的智力和广泛影响来评估Criteia的评估。