CAREER:Earth System Science Perspective on the Sulfur Cycle

Farquharmonic-0348382 PI建议使用多种硫同位素来研究地球硫循环的演变。 该研究包括元古代地质记录中质量相关硫同位素分馏的研究、金刚石中硫化物包裹体质量无关硫同位素分馏的研究以及太古代和元古代碳酸盐中质量无关硫同位素分馏的研究。 第一项调查将致力于确定是否有多种同位素证据来证明元古代的进化事件影响了硫循环的变化。 第二次调查将重点提供地球早期地幔和地壳之间硫物质转移的限制，第三次调查将寻求了解地球早期海洋硫酸盐储层的性质，大小和演变。 该提案还通过正式制定一项正在进行的计划来整合研究和教育，在该计划中，PI与指导本科生的研究生和博士后研究人员合作。 它还有助于开发一对新的课程，重点是地球系统的革命，将针对马里兰州一般核心大学的大一和大二水平的本科生，并在隔年，为马里兰州荣誉计划的大学，这将是一个新的跨学科地球系统科学课程的重要组成部分。

FarquharEAR-0348382The PI proposes to use multiple sulfur isotopes to study the evolution of Earth's sulfur cycle. The research includes investigation of mass-dependent sulfur isotope fractionations in the Proterozoic geologic record, investigation of mass-independent sulfur isotope fractionations of sulfide inclusions in diamond, and investigation of mass-independent sulfur isotope fractionations in Archean and Proterozoic carbonates. The first investigation will work to identify whether there is multiple isotope evidence for proposed evolutionary events in the Proterozoic that effected changes in the sulfur cycle. The second investigation will focus on providing constraints on material transfer of sulfur between Earth's early mantle and crust, and the third investigation will seek to understand the nature, size, and evolution of Earths early oceanic sulfate reservoirs. The proposal also integrates research and education by formalizing an ongoing program in which the PI works with graduate students and postdoctoral researchers who mentor undergraduate students. It also contributes to the development of a new pair of courses focused on Revolutions of the Earth System that will be directed toward freshman and sophomore level undergraduates in the University of Maryland general core and, in alternate years, for the University of Maryland Honors program that will be an essential part of a new interdisciplinary Earth System Science curriculum.