Collaborative Studies (USC and UM): Fractionation of Ge and Si during Diagenesis, and its Implications for Regulating the Oceanic Ge/Si Ratio

合作研究（南加州大学和密歇根大学）：成岩过程中 Ge 和 Si 的分馏及其对调节海洋 Ge/Si 比率的影响

• 批准号: 9911608
• 负责人: Douglas Hammond
• 金额: $ 17.6万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-01 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911608&HistoricalAwards=false
• 关键词: Collaborative; Studies; USC; UM; Fractionation

To understand how the earth's climate might change in response to anthropogenic influence, such as the burning of fossil fuel, it is necessary to understand the natural variability of climate over glacial/interglacial times. One method of studying this variability is through investigation of the deep-sea sedimentary record, which contains chemical, fossil and mineralogic evidence of past climatic conditions. A potentially important signal in the sediments is the ratio of Ge to Si in opal, which varies in response to changing ocean conditions. To derive the maximum use of this tool, its chemical behavior in the sea floor must be fully understood. Therefore, this work will study the fractionation of Ge and Si in ocean sediments by laboratory experiments that would create a controlled diagenetic setting to determine the incorporation of Ge and Si into iron oxyhydroxices and sulfides. Additionally, existing pore water samples will be analyzed to investigate the behavior of Ge in different ocean settings. Field Studies in the California borderland will be carried out to collect additional pore waters and to deploy in-situ benthic chambers to measure the fractionation Ge and Si in different environments.

要了解地球气候如何随着人为影响的响应而发生变化，例如燃烧化石燃料，有必要了解气候在冰川/冰川间时期的自然变化。研究这种变异性的一种方法是研究深海沉积记录，该记录包含过去气候条件的化学，化石和矿物学证据。沉积物中潜在的重要信号是蛋白石中GE与Si的比率，随着海洋条件的变化而变化。为了最大程度地使用该工具，必须完全了解其在海底中的化学行为。因此，这项工作将通过实验室实验研究海洋沉积物中GE和SI的分馏，该实验将创建受控的成岩成分环境，以确定将GE和SI掺入氧化氧化物和硫化物中。 此外，将分析现有的孔隙水样品，以研究GE在不同海洋环境中的行为。 将在加利福尼亚州边境地区进行现场研究，以收集额外的孔隙水，并部署原地底栖动物室，以测量不同环境中的分馏GE和SI。