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Ostracode-Shell Luminescence Dating for Quaternary Deposits

第四纪沉积物介壳壳发光测年

基本信息

批准号：
0087827
负责人：
Glenn Berger
金额：
$ 14.05万
依托单位：
Nevada System of Higher Education, Desert Research Institute
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-03-01 至 2007-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087827&HistoricalAwards=false
关键词：
Ostracode Shell Luminescence Dating Quaternary

项目摘要

ABSTRACTOSTRACODE-SHELL LUMINESCENCE DATING FOR QUATERNARY DEPOSITSThis proposal intends to build on preliminary feasibility tests, to develop a new luminescence clock for the direct dating of an important Quatemary paleoenvironmental proxy indicator: ostracode shells. Non-marine ostracode shells serve as proxy indicators of paleoenvironmental conditions in lakes, ponds, springs and streams. Presently these shells can be dated directly by radiocarbon methods, but a means to date them directly when older than 35-40 ka would provide opportunities for new discoveries in the worldwide effort to reconstruct details of paleoenvironmental histories from continental sedimentary records.Preliminary work by the PI indicates that ostracode shells have some desired luminescence properties. However, refined sample preparation protocols suitable for luminescence dating need to be developed, and almost nothing is known of their likely useful age range. Natural samples of ostracode shells will be collected from independently well-dated (by 14C) lacustrine beds (late Pleistocene age) from the lake Bonneville Basin (northwestern Utah) and from Mono Lake (eastem Califomia). The foundations for reliable luminescence dating protocols will be established. These protocols will then be applied to one or two samples older than ca. I00 ka, to extrapolate from the developmental tests. This research will form the basis of a graduate student's thesis project.

摘要介形虫-贝壳发光法测定第四纪沉积物的年代本项目拟在初步可行性试验的基础上，开发一种新的发光时钟，用于直接测定一种重要的非生物古环境代用指标：介形虫贝壳的年代。非海洋介形虫贝壳作为湖泊、池塘、泉水和溪流中古环境条件的代用指标。目前这些贝壳可以直接用放射性碳法测年，但如果能直接测定它们的年龄，那么在35-40 ka之前，将为世界范围内从大陆沉积记录重建古环境历史细节的努力提供新的发现机会。然而，需要开发适合于发光测年的精细样品制备方案，并且几乎不知道它们可能有用的年龄范围。介形虫壳的天然样品将从邦纳维尔湖盆地（犹他州西北部）和莫诺湖（东加利福尼亚州）的独立年代测定良好（14 C）的湖床（晚更新世时代）中收集。将建立可靠的发光测年方案的基础。然后将这些方案应用于一个或两个比ca更早的样本。100 ka，从发展测试中推断。这项研究将形成一个研究生的论文项目的基础。