Thermoluminescence Dating Studies of Lake Cores from Alaska

这个奖项是为了支持北极湖泊和河口（PALE）古气候学的一个要素。北极湖泊被认为是古环境代用信息（如化石花粉、沉积物化学）的宝贵宝库，对古气候学研究具有重要意义。然而，在放射性碳测年通常的30-40 ka限制之外，对这些化石花粉记录进行解释所需的测年控制目前尚不可用。通过对一个北极湖泊岩心（松鼠湖）进行初步的单次热释光测年，验证了该地区沉积物的热释光测年能力，但有些结果不明确。这个奖项概述了TL日期和其他测试(例如：（TL发射光谱的测量），旨在评估松鼠湖岩心的一些样品的这些模糊的初步结果的原因。提出的测年实验将完善北极湖泊沉积物的TL沉积物测年程序的局限性和实用性，为北极湖泊提供第一个30-40 ka以上的“辐射”测年记录，并为未来将TL测年应用于北极圈湖泊的长芯（0-200 ka）沉积物记录提供更坚实的基础。

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.