Pleistocene Sea Level Reconstruction

更新世海平面重建

• 批准号: 0727696
• 负责人: Richard Fairbanks
• 金额: $ 19.01万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0727696&HistoricalAwards=false
• 关键词: Pleistocene; Sea; Level; Reconstruction

U/Th dating of fossil corals provides the fundamental timescale needed to evaluate the timing and rates of change of past sea level fluctuations during the Late Pleistocene. Research conducted as part of this project challenges the use of open system dating techniques and proposes to locate closed system aragonite in fossil Acropora palmata corals using novel microscopic screening and laser ablation techniques for fine-scale sampling. Fine scale analyses will attempt to better understand the magnitude and possible causes for the heterogeneities of U, Th and Pa observed within fossil coral specimens. The project will also sample fossil corals to reconstruct sea level variability during MIS 3 using material from Araki Island and Barbados, as well as to explore marine isotope stage 5 sea level estimates using the extensive archive of fossil corals that was previously collected by the PI.

化石珊瑚的U/Th测年提供了评估晚更新世期间过去海平面波动的时间和变化率所需的基本时间尺度。作为这一项目的一部分进行的研究对开放系统测年技术的使用提出了挑战，并建议使用新的显微镜筛选和激光烧蚀技术进行精细取样，以确定Acropora palmata珊瑚化石中封闭系统文石的位置。精细尺度的分析将试图更好地了解的规模和可能的原因，在化石珊瑚标本中观察到的U，Th和Pa的异质性。该项目还将对珊瑚化石进行采样，利用荒木岛和巴巴多斯的材料重建MIS 3期间的海平面变化，并利用PI先前收集的大量珊瑚化石档案探索海洋同位素第5阶段海平面估计。