U-Pb Geochronology in Marine Carbonates: A New Approach for Age Dating in Paleoclimate Reconstruction

海洋碳酸盐中的 U-Pb 地质年代学：古气候重建中年龄测定的新方法

• 批准号: 9617595
• 负责人: Stephen Getty
• 金额: $ 15.24万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-02-15 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9617595&HistoricalAwards=false
• 关键词: Pb; Geochronology; Marine; Carbonates; New

9617595 Getty This project will attempt to develop U-Pb dating for shallow marine carbonates (corals) between 1-10 million years old. Current dating methods are inadequate in this time range; successful development of the method will permit studies of carbonate bank evolution and eustatic sealevel change under different climate conditions than those of the present. Preliminary data on samples from the Pinecrest Formation of Florida indicate large U/Pb ratios, rapid production of 206Pb and age estimate accurate to about+ 100,000 years. The project will first examine a relatively young coral using both the standard U.-series and the U-Pb techniques to evaluate U-Pb initial conditions. Corals and molluscs from the Pinecrest Formation will then be analyzed to test applicability further.

小行星9617595 该项目将尝试对100万至1000万年前的浅海碳酸盐（珊瑚）进行U-Pb测年。目前的测年方法在这一时间范围内是不够的;该方法的成功发展将允许在不同的气候条件下比现在的碳酸盐岩银行的演变和海平面变化的研究。来自佛罗里达Pinecrest地层样品的初步数据表明，铀/铅比值大，206铅生成迅速，年龄估计精确到约10万年。该项目将首先使用标准的美国-系列和U-Pb技术来评价U-Pb初始条件。然后将分析松顶组的珊瑚和软体动物，以进一步测试适用性。