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：北美中大陆末次冰期/间冰期的黄土-古土壤记录的详细年表黄土沉积是第四纪长期气候变化的最重要的陆地记录之一。可以从黄土沉积物中提取高分辨率的过去环境条件的记录，前提是这些沉积物可以准确地测年。我们建议应用三种独立的测年技术(10Be清单、AMS14C和光激发发光)来开发内布拉斯加州东部最近两个冰川/间冰期黄土的高分辨率年代学。这一年表将使我们能够准确估计这段时间内进入大气的尘埃通量，评估北美中大陆相互竞争的黄土源的相对贡献，并确定内布拉斯加州东部最后一次间冰期(Sangamon)土壤所代表的时间长度。

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.