Sulfur isotope study of Phanerozoic carbonate associated sulfate

显生宙碳酸盐伴生硫酸盐的硫同位素研究

• 批准号: 0918382
• 负责人: James Farquhar
• 金额: $ 14.83万
• 依托单位: University of Maryland, College Park
• 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: 2009-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0918382&HistoricalAwards=false
• 关键词: Sulfur; isotope; study; Phanerozoic; carbonate

This award is funded under the American Recovery and Reinvestment Actof 2009 (Public Law 111-5). This proposal requests funds to support research by a Ph.D. student, who is working to establish a record of sulfur isotope ratios (involving all four sulfur isotopes) using carbonate associated sulfate as a proxy of seawater sulfate and using this record to test a developing hypothesis about the evolution of the sulfur cycle. Specifically, we hypothesize that there was a change in the magnitude of the fractionation between sulfate and buried pyrite that occurred in the middle Phanerozoic, and that points to a change in the biological pathways involved in sulfur cycling. We aim to test this hypothesis and to explore its implications for and connections with the sulfur cycle as well as to elucidate the mechanisms behind the change if such change is confirmed. Preliminary results of analyses and of model calculations form the basis for the hypotheses that are to be tested and are described in more detail in the body of this proposal. This proposal requests funds to support the second two years of research and includes a request for a graduate stipend, standard benefits, tuition, analytical costs and travel to two meetings where results will be presented. No funds are requested to support the PI, but funds are requested to support an undergraduate researcher. This is done as part of a laboratory policy to involve undergraduates, which we believe carries benefits for them by integrating them in high-level research projects, and for the postdoctoral student's professional development by placing him in the role of mentor as well as researcher. In the past these projects have resulted in new ideas being developed and independent projects that may form the basis for University of Maryland senior thesis projects. Other broader impacts include the ncorporation of research results and the research model in public presentations and other professional activities by the PI.

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。该提案请求资金支持博士的研究。学生正在努力使用碳酸盐相关硫酸盐作为海水硫酸盐的替代物来建立硫同位素比率记录（涉及所有四种硫同位素），并使用该记录来测试有关硫循环演化的发展假设。具体来说，我们假设显生宙中期发生的硫酸盐和埋藏黄铁矿之间的分馏程度发生了变化，这表明参与硫循环的生物途径发生了变化。我们的目的是检验这一假设，探索其对硫循环的影响和联系，并在这种变化得到证实的情况下阐明变化背后的机制。分析和模型计算的初步结果构成了要测试的假设的基础，并在本提案的正文中进行了更详细的描述。该提案要求提供资金支持后两年的研究，包括研究生津贴、标准福利、学费、分析费用以及参加两次会议的差旅费，在会议上将介绍结果。不需要资金来支持 PI，但需要资金来支持本科研究员。 这是作为实验室政策的一部分，让本科生参与进来，我们相信，通过将本科生融入高水平的研究项目，这会给他们带来好处，并通过让博士后学生担任导师和研究员的角色，为他们的专业发展带来好处。过去，这些项目产生了新的想法和独立项目，这些项目可能构成马里兰大学高级论文项目的基础。其他更广泛的影响包括 PI 将研究成果和研究模型纳入公开演讲和其他专业活动中。