History of I-129 Deposition in Marine Sediments

I-129 在海洋沉积物中沉积的历史

• 批准号: 9907024
• 负责人: Udo Fehn
• 金额: $ 4.64万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907024&HistoricalAwards=false
• 关键词: History; 129; Deposition; Marine; Sediments

ABSTRACTOCE-9907024The isotope 129I is a cosmic ray produced species with a decay half-life of 15.7 million years. If its distribution is well known, it could be applied to various geologic and paleoceanographic studies. This work will determine the 129I/I ratio and I concentrations in sixteen samples from four ODP cores in order to establish the history of I-129 deposition in marine sediments of the open ocean over the period of the last 25 million years. The cores are representative of different paleoceangraphic and sedimentological conditions from the Atlantic and Pacific Oceans. The work will incorporate micropaleontological and stable isotope studies in order to put the I-129 results into the appropriate time scale. By measuring the 129I/I ratio in independently age-dated cores, the time history of 129I deposition will be reconstructed.

同位素129 I是宇宙射线产生的物质，衰变半衰期为1570万年。如果它的分布是众所周知的，它可以应用于各种地质和古海洋学研究。这项工作将确定129 I/I的比例和I浓度在16个样品从四个ODP的核心，以建立历史的I-129沉积在海洋沉积物中的开放的海洋在过去的2500万年。 这些岩心代表了大西洋和太平洋不同的古海洋学和沉积学条件。这项工作将结合微体古生物学和稳定同位素研究，以便将I-129结果纳入适当的时间尺度。 通过测量独立定年岩心中的129 I/I比值，重建129 I沉积的时间历史。