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

气候变冷每1000到2000年就会增加冰漂流碎屑（IRD）的沉积。在全新世可以发现几个这样的潮湿事件，因此可能是冰原以外的东西在调节这些事件。pi计划针对3层，新仙女木，以及H3和H6海因里希事件进行特别关注。将使用多种工具来确定IRD的可能来源，包括粒度、稳定同位素分析、长石颗粒中的Pb同位素组成和角辉石中的Ar/Ar组成，以确定物源。来自哈德逊海峡、圣劳伦斯湾、丹麦海峡和东格陵兰洋流地区的样本可能有助于确定来自格陵兰、斯堪的纳维亚等地的来源。

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.