Combined 230Th and 231Pa Dating: Establishing the Absolute Timing of late Quaternary Climate Changes and Calibrating the 14 C Timescale

230Th 和 231Pa 组合测年：确定晚第四纪气候变化的绝对时间并校准 14 C 时间尺度

• 批准号: 9814211
• 负责人: Warren Beck
• 金额: $ 7万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814211&HistoricalAwards=false
• 关键词: Combined; 230Th; 231Pa; Dating; Establishing

The ESH award will support a team of investigators to address three separate projects, each combining the use of radiochemical datinge techniques (14C, 230Th and 231Pa) with stable isotope and trace element analysis of corals and speleothems. Projects include: (1) Calibration of the radiocarbon time scale between 10,000 and 48,000 years BP using previously-collected corals from Papua New Guinea and speleothems from the Bahamas; (2) Establish a high-resolution climate record for the mid-continent of North America from Missouri speleothems; (3) Determine the age and sea-level history for the penultimate deglaciation (Termination II) using coral outcrops in Barbados.

ESH奖将支持一个调查人员团队解决三个单独的项目，每个项目都结合了放射化学日期技术（14C，230和231PA）的使用，并与稳定的同位素以及珊瑚和Speleothems的痕量元素分析。 项目包括：（1）使用巴布亚新几内亚的先前收集的珊瑚和巴哈马的speleothems对放射性碳时间量表的校准； （2）从密苏里州的speleothems为北美中部地区建立高分辨率的气候记录； （3）确定使用巴巴多斯的珊瑚露头倒数第二次脱水的年龄和海平面历史。