Collaborative Research: Experimental controls on Clumped Isotope Signatures of Methane in Deep-Sea Vents

合作研究：深海喷口甲烷聚集同位素特征的实验控制

• 批准号: 2308388
• 负责人: James Farquhar
• 金额: $ 27.48万
• 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: 2023
• 资助国家: 美国
• 起止时间: 2023-05-15 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2308388&HistoricalAwards=false
• 关键词: Collaborative; Research; Experimental; controls; Clumped

The project will study the controls on the chemical characteristics of methane gas in ocean hydrothermal systems. This project will use laboratory experiments to explore the isotopic composition of methane gas and carbon dioxide. Those lab data will enable future studies of CH4 and CO2 in seafloor vents. The study will inform studies of the cycling of carbon between the Earth’s interior and oceans. It is also relevant to life in extreme environments and the origin of life. Project broader impacts include research opportunities for graduate and undergraduate students and high-school summer interns. Graduate students from California State University, San Bernardino (a minority-serving institution) will spend time at the University of Maryland and the Carnegie Institution of Washington. There they will gain experience with state-of-the-art isotope geochemistry.Deep-sea hydrothermal vent systems affect the cycling of carbon between the Earth’s interior and oceans by introducing organic compounds of thermogenic, abiotic and microbial origin to the overlying water column. Vent fluids from both basalt and ultramafic-hosted hydrothermal systems contain abundant CH4 in addition to other organic species. This project aims to explore the origin and evolution of CH4 in deep-sea vents by employing the use of double-substituted and doubly-deuterated isotopologues (13CH3D, 12CH2D2). In a series of hydrothermal experiments involving organic matter decomposition. CO2 reduction and non-equilibrated CH4 gases in the presence of mineral catalysts, the distribution of rare methane isotopologue will be assessed by the use of a high-mass-resolution gas-source multiple collector mass spectrometer (Panorama, UMD). Experiments will assess the equilibrium relationships in the 12CH2D2-13CH3D-12CH3D-12CH4-13CH4-HD-HDO-H2O system and describe isotope effects associated with the impact of mineral phases and H2O H isotope composition on the abiotic and thermogenic formation mechanisms. This study aims to be a comprehensive study of Delta-12CH2D2 and Delta-13CH3D evolution applied to subseafloor hydrothermal systems and water/rock interactions deeper in the oceanic crust.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.

该项目将研究海洋水热系统中甲烷气体的化学特征的控制。该项目将使用实验室实验来探索甲烷气和二氧化碳的同位素组成。这些实验室数据将在海底通风口中对CH4和CO2的未来研究。该研究将为碳内部和海洋之间的碳循环循环提供信息。它在极端环境和生活的起源中也与生活有关。项目更广泛的影响包括研究生和本科生以及高中暑期实习生的研究机会。来自加利福尼亚州立大学的圣贝纳迪诺（San Bernardino）的研究生（少数派服务机构）将在马里兰州大学和华盛顿卡内基大学度过时光。他们将在那里获得最先进的同位素地球化学的经验。深入的热液排气系统通过将热，非生物和微生物起源的有机化合物引入上层水柱，从而影响地球内部和海洋之间碳的循环。除其他有机物种外，玄武岩和超托管水热系统的排气流体都含有丰富的CH4。该项目旨在通过使用双重取代和双层的同位素学（13CH3D，12CH2D2）来探索深海通风口中CH4的起源和演变。在一系列涉及有机物分解的水热实验中。在存在矿物催化剂的情况下，CO2还原和未平衡的CH4气体，将通过使用高质量分辨率的气体源多收集器质谱仪（Panorama，UMD）来评估稀有甲烷同位素学的分布。实验将评估12CH2D2D2-13D-12CH3D-12CH3D-12CH4-13CH4-13CH4-HD-HDO-HDDO-H2O系统中的平衡关系，并描述与矿物相和H2O H同位素组成对非生物和热形成形成机制的影响相关的同位素效应。这项研究旨在是对Delta-12CH2D2和Delta-13CH3D进化的全面研究，适用于海底水热系统和水/岩石相互作用在Oceanic Crust中更深入的水/岩石相互作用。该奖项反映了NSF的法定任务，并通过使用基金会的知识优点和广泛的影响来评估NSF的法定任务。