Thermoluminescence Dating Studies of Lake Cores from Alaska

阿拉斯加湖芯的热释光测年研究

• 批准号: 9224361
• 负责人: Glenn Berger
• 金额: $ 4.26万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224361&HistoricalAwards=false
• 关键词: Thermoluminescence; Dating; Studies; Lake; Cores

This award is in support of one element of paleoclimatology from Arctic Lakes and Estuaries (PALE). Arctic lakes are recognized as valuable repositories of paleoenvironmental proxy information (e.g. fossil pollen, sediment chemistry) that is important for paleoclimatological studies. However, beyond the usual 30-40 ka limit of radiocarbon dating, dating control needed form the interpretation of such fossil pollen records is presently unavailable. Preliminary, single-analysis thermoluminescence (TL dating results have been obtained for one Arctic lake core (Squirrel Lake) to test the capability of TL dating for such Arctic sediments, but some results are ambiguous. This award outlines TL dating and other tests(e.g. measurement of TL emission spectra) designed to assess the cause of these ambiguous, preliminary results for some samples for the Squirrel Lake core. The proposed dating experiments will refine the limitations and usefulness of TL sediment dating procedures for Arctic lake sediments, provide the first "radiometrically" dated record beyond 30-40 ka for Arctic lakes, and provide a firmer basis for future application of TL dating to long-core (0-200 ka) sediment records for circumpolar Arctic lakes.

这个奖项是为了支持古气候学的一个要素 北极湖泊和河口（PALE） 北极湖泊是 被认为是古环境代用品的宝贵宝库 信息（例如化石花粉，沉积物化学）， 对古气候学研究很重要 然而，除了 放射性碳测年的一般极限为30-40 ka，需要进行测年控制 目前对这些化石花粉记录的解释是 不可用. 初步，单分析热释光（TL 对一个北极湖芯的测年结果已获得 （松鼠湖），以测试热释光测年的能力， 沉积物，但有些结果是模棱两可的。 该奖项概述了TL 测年和其他测试（例如TL发射光谱的测量） 旨在评估这些模棱两可的原因，初步 松鼠湖岩心的一些样本的结果 拟议 测年实验将进一步完善热释光的局限性和实用性 北极湖泊沉积物的沉积物测年程序，提供了 北极地区首次超过30-40 ka的“辐射测量”定年记录 为今后TL的应用提供了更坚实的基础 环极区长岩心（0-200 ka）沉积物记录的年代测定 北极湖泊。