The Subduction Margin Carbon Cycle: A Preliminary Assessment of the Distribution Patterns of Multicycle Carbon

俯冲边缘碳循环：多循环碳分布模式的初步评估

• 批准号: 1144483
• 负责人: Neal Blair
• 金额: $ 26.45万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1144483&HistoricalAwards=false
• 关键词: Subduction; Margin; Carbon; Cycle; Preliminary

The role of recycled fossil C in elemental budgets and organic C behavior on active margins is not known beyond the mid-slope. Fossil C would be expected to persist longer in surface environments than younger materials because of its low reactivity. Its persistence would influence the global C and O2-cycles, product formation during deep burial, and the interpretation of sedimentary organic geochemical records. This exploratory study of the three GeoPRISMS Subduction Cycles and Deformation (SCD) primary focus sites, the Alaskan, Cascadia and Hikurangi Margins, has the specific objective of developing a preliminary assessment of the distribution of multicycle C at the sites. Samples will come primarily from archives held by the National Institute of Water and Atmospheric Research of New Zealand and the Deep Sea Drilling Project/Ocean Drilling Project repositories in the US. In addition, sample collection and analysis is proposed for the planned Integrated Ocean Drilling Program expedition to the Alaskan margin in 2013. Analyses of samples will include Raman and FTIR microscopy, stable carbon and radiocarbon isotopic measurements, and elemental (H/C) determinations. The survey to be generated by this project will be a first look at multicycle C across several active margin environments beyond the mid-slope. The baseline information will be used to plan future C-cycling and paleoenvironmental studies.Broader Impacts: This project and participation in the GeoPRISMS program will be valuable educational and professional experiences for the graduate student involved. Supplemental REU funding will be sought to engage an undergraduate in the research. A GIS-based education tool for the high school study of the global C-cycle will be developed in collaboration with Northwestern?s Office of STEM Education Partnerships.

循环化石碳的作用，在元素收支和有机碳行为的活动边缘是不知道超越中坡。由于化石C的低反应性，预计其在地表环境中的持续时间比较新的材料更长。它的持续性将影响全球C和O2-循环，深埋过程中的产品形成，以及沉积有机地球化学记录的解释。这项对GeoPRISMS俯冲旋回和变形（SCD）三个主要焦点地点（阿拉斯加边缘、卡斯卡迪亚边缘和希库朗吉边缘）的探索性研究的具体目标是对这些地点的多旋回C分布进行初步评估。样本将主要来自新西兰国家水和大气研究所和美国深海钻探项目/海洋钻探项目储存库的档案。此外，还提议为计划于2013年在阿拉斯加边缘进行的综合大洋钻探方案考察收集和分析样本。样品分析将包括拉曼和FTIR显微镜、稳定碳和放射性碳同位素测量以及元素（H/C）测定。该项目将进行的调查将是对中坡以外几个活跃边缘环境中的多晶C的第一次考察。基线信息将用于规划未来的碳循环和古环境研究。更广泛的影响：这个项目和参与GeoPRISMS计划将是宝贵的教育和专业经验的研究生参与。补充REU资金将寻求从事本科生的研究。一个基于GIS的教育工具的高中研究的全球C-循环将开发与西北合作？STEM教育合作伙伴办公室。