Magnetic Susceptibility Variations in Cave Sediments from the Moravian Karst, Czech Republic: A Record of Environmental Change

97-05718海洋、湖泊和风吹(黄土)沉积物中铁的矿物磁性变化已被证明反映了地球轨道、气候和人类活动的变化。在这些环境磁学研究中，洞穴沉积物几乎没有引起人们的注意，在许多情况下，这些沉积物包含了早期人类丰富的历史。捷克地质调查局和密歇根理工大学在过去几年里一直在研究摩拉维亚喀斯特的洞穴沉积，以重建沉积这些沉积物的更新世/全新世古气候记录。这项拟议的研究集中于发现环境和/或人为过程的性质，这些过程可能导致两个洞穴沉积物序列中磁化率和其他微磁性参数的变化。第一个序列来自Spiralka洞穴的洪水沉积，本节上部记录的磁化率变化似乎跟踪了布拉格-Klementum天文台(过去200年)的直接温度测量确定的10年平均冬季温度异常。第二个层序由库尔纳洞入口相的黄土沉积组成，库尔纳洞是一个研究得很好的考古遗址。初步工作表明，磁化率高可能是由冷时段成壤物质的侵蚀增加控制的，而不是由温暖时段的就地成壤增强控制的。这项工作对于将中欧洞穴地层学(及其人类记录)与全球冰量变化联系起来也具有重要意义，因为库尔纳洞穴是中欧洞穴沉积的典型地点。***

97-05718 Diehl Variations in mineral magnetic properties of iron from marine, lake, and wind blown (loess) deposits have been shown to reflect changes in Earth's orbit, climate, and human activity. Cave sediments have gone almost unnoticed in these environmental magnetic studies and, in many instances, these sediments contain a rich history of early man. The Czech Geological Survey and Michigan Technological University have been studying the cave deposits of the Moravian Karst over the last several years to reconstruct the Pleistocene/Holocene paleoclimate record in which these sediments were deposited. This proposed research concentrates on discovering the nature of environmental and/or anthropogenic processes that may be causing variations in magnetic susceptibility and other mileral magnetic parameters in two sequences of cave sediments. The first sequence is from the floodwater deposits of Spiralka Cave where the magnetic susceptibility variations recorded in the upper part of this section appear to track the 10-year averaged winter temperature anomalies determined from direct temperature measurements (over the last 200 years) at the Prague-Klementinum Observatory. The second sequence consists of loess deposits from the entrance facies of Kulna Cave, a well-studied archeological site. Preliminary work indicates magnetic susceptibility highs are perhaps controlled by increased erosion of a pedogenic source material during cold intervals rather than by in-situ pedogenic enhancement during warm intervals. This work also has important implications for tying the cave stratigraphy of Central Europe (and its record of man) to changes in the global ice volume as Kulna Cave is the type locality for cave deposits in Central Europe. ***