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.

硅藻中保存的海洋Ge:Si记录显示了随时间的变化，反映了海洋Si周期的变化。这种变化可能受到风化与热液输入比值的变化、蛋白石与非蛋白石相中Ge去除相对速率的变化或海洋中Si内部循环的变化以及硅藻对Ge:Si的分馏的变化的影响。出于这个原因，俄勒冈州立大学和南加州大学的一名科学家将研究锗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，分别评估在低温风化、高温地热系统、成岩作用和硅藻吸收过程中是否存在Ge同位素分馏。预计本研究结果将表明，Ge同位素可用于区分风化和热液流动的相对速率。