Collaborative Research (OSU and USC): Evaluating the Utility of Germanium Isotopes as a Paleoproxy

合作研究（俄勒冈州立大学和南加州大学）：评估锗同位素作为古代理的效用

• 批准号: 0326575
• 负责人: Douglas Hammond
• 金额: $ 3.44万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0326575&HistoricalAwards=false
• 关键词: Collaborative; Research; OSU; USC; Evaluating

ABSTRACTOCE-0326574OCE-0326575Records of oceanic Ge:Si preserved in diatoms show temporal variations that reflect changes in the marine Si cycle through time. The variations may be influenced by changes in the ratio of weathering to hydrothermal inputs, changes in the relative rates of Ge removal in opal versus non-opal phases or by changes in the internal cycling of Si in the ocean and the fractionation of Ge:Si by diatoms. For this reason, a scientist from Oregon State University and the University of Southern California will investigate the utility of germanium isotopes as a geochemical tracer. To attain this goal, the PIs plan to analyze samples from rivers, geothermal fluids, sediment pore waters and diatoms to assess whether there is Ge isotope fractionation during low-temperature weathering, in high-temperature geothermal systems, during diagenesis and during diatom uptake, respectively. It is anticipated that results from this study will show that Ge isotopes can be used to distinguish the relative rates of weathering and hydrothermal fluid flow.

Abstractoce-0326574OCE-0326575海洋GE的记录：保存在硅藻中的Si显示出时间变化，反映了随着时间的推移，海洋SI周期的变化。 这种变化可能受风化与热液输入的比率的变化，蛋白石中GE去除的相对去除速率的变化，或者是非开放阶段的变化，或者是海洋中SI内部循环的变化以及diotoms的GE：Si的分馏。 因此，俄勒冈州立大学和南加州大学的一位科学家将调查同位素作为地球化学示踪剂的效用。 为了实现这一目标，PIS计划分析来自河流，地热流体，沉积物孔隙水和硅藻的样品，以评估在低温风化期间，在高温地热系统中，分散和在DioTomptake期间分别有GE同位素分馏。 可以预料，这项研究的结果将表明，GE同位素可用于区分风化和热液流体流量的相对速率。