COLLABORATIVE RESEARCH: A Detailed Chronology of the Loess-Paleosol Record of the Last Glacial/Interglacial Cycle in the North American Midcontinent

合作研究：北美大陆中部末次冰期/间冰期旋回黄土-古土壤记录的详细年代学黄土沉积物是第四纪长期气候变化的最重要的陆地记录之一。 只要能对黄土沉积物进行准确的年代测定，就能从黄土沉积物中提取出过去环境条件的高分辨率记录。 我们建议应用三个独立的测年技术（10 Be库存，AMS 14 C，光激发发光），以开发一个高分辨率的年代学黄土的最后两个冰期/间冰期循环在内布拉斯加州东部。 这一年表将使我们能够准确估计在这段时间内的灰尘通量到大气中，以评估在北美大陆中部竞争黄土源的相对贡献，并确定时间的长度所代表的最后一个间冰期（Sangamon）土壤在内布拉斯加州东部。

ABSTRACTCollaborative Research: A detailed chronology of the Loess-Paleosol Record of the last glacial/Interglacial Cycle in the North American MidcontinentLoess deposits represent one of the most important terrestrial records of long-term Quaternary climatic change. High-resolution records of past environmental conditions can be extracted from loess deposits provided that the deposits can be accurately dated. We propose to apply three independent dating techniques (10Be inventory, AMS14C, and Optically Stimulated Luminescence) to develop a high-resolution chronology for loess of the last two glacial/interglacial cycles in eastern Nebraska. This chronology will enable us to make accurate estimates of dust flux to the atmosphere over this time period, to evaluate the relative contribution of competing loess sources in the North American Midcontinent, and to determine the length of time represented by the last interglacial (Sangamon) soil in eastern Nebraska.