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Age and Isotopic Characterization of Ice-Rafted Sand Grains in the North Atlantic

Age and Isotopic Characterization of Ice-Rafted Sand Grains in the North Atlantic
北大西洋冰筏沙粒的年龄和同位素特征
批准号：
9633554
负责人：
Sidney Hemming
金额：
$11.0万
依托单位：
Columbia University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1996
资助国家：
美国
项目状态：
已结题
起止时间：
1996-11-15 至 1998-10-31
来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633554&HistoricalAwards=false
关键词：
AgeIsotopicCharacterizationIceRafted

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英文摘要
9633554 Broecker Climatic cooling enhances the deposition of ice rafted detritus (IRD) every 1000 to 2000 years. Several such dampened events can be found in the Holocene that thus something other than ice sheets may be modulating these events. The PIs plan to target 3 layers, the Younger Dryas, and H3 and H6 Heinrich events for special focus. Multiple tools will be used to determine the likely sources for IRD, including grain size, stable isotopic analysis, and composition of Pb isotopes in feldspar grains and Ar/Ar in hornblende to determine the provenance. Samples from the Hudson Straits, Gulf of St. Lawrence, Denmark Straits and East Greenland current areas may help identify the sources from Greenland, Scandinavia, etc.
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