Boron Isotope Paleoceanography

硼同位素古海洋学

• 批准号: 9501530
• 负责人: Arthur Spivack
• 金额: $ 11.32万
• 依托单位: University of North Carolina at Wilmington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9501530&HistoricalAwards=false
• 关键词: Boron; Isotope; Paleoceanography

9501530 Spivack It has been argued that the boron isotopic composition of foraminifera test are a function of both the isotopic composition of seawater and pH. Initial data indicates that the B isotopic composition of seawater has been nearly constant over the past 20 Myr while fossil foraminifera tests exhibit a decreasing trend between 7.5 and 20 Ma. This data has been used to infer changes in surface ocean pH, approximately constant between 7.5 Ma and the present and with an increasing trend form 20 Ma (pH 7.4 4 + 0.2) to 7.5 Ma. Investigators on this project will: 1. Conduct a systematic intercomparison of the &11B of common planktonic species isolated form recent sediments, 2. systematically examine the foraminifera 11B.

有孔虫试验的硼同位素组成是海水同位素组成和ph的函数。初步数据表明，在过去的20 Myr中，海水的硼同位素组成几乎是恒定的，而化石有孔虫试验在7.5 - 20 Ma之间呈下降趋势。这些数据被用来推断海洋表面pH值的变化，从7.5 Ma到现在大致恒定，从20 Ma （pH 7.4 4 + 0.2）到7.5 Ma有增加的趋势。该项目的研究人员将：对从近期沉积物中分离出来的常见浮游生物物种进行系统的相互比较。系统地检查有孔虫11B。