Harsh periglacial climate at MIS 3/MIS 2 transition reflected in Central European Loess-Paleosol Sequences

中欧黄土-古土壤序列反映的 MIS 3/MIS 2 过渡时期的严酷冰缘气候

• 批准号: 280243180
• 负责人: Professor Dr. Ludwig Zöller
• 金额: --
• 依托单位: Lehrstuhl für Physische Geographie und Geoökologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/280243180?language=en
• 关键词: Harsh; periglacial; climate; MIS; transition

The Brandenburg / Leszno Phase of the last (Weichselian) glaciation represent the regional Last Glacial Maximum (LGM) in northeastern Germany and western Poland. Since recent OSL dating and geomor-phological results suggest a possibility of late MIS 3 age (30 to max. 34 ka) it appears that this regional LGM may predate the global LGM by up to 10 ka. Following the world-wide LGM review of HUGHES ET AL. (2013) more caution is advisable when correlating maximal regional extend of ice shields with proxies for global ice volume (MIS). In case of a late MIS 3 regional LGM an adjoining belt with harsh periglacial conditions is to be expected, for which first evidence was already found: An up to 6 m thick loess of typically pleniglacial habitus with OSL ages between ca. 29 and 35 ka was recently detected in the famous Nussloch section (Germany), and a ca. 2 m thick loess bed dated between ca. 28 and 33 ka with a grandiose network of ice vein casts has recently been published from Havringcourt, Pas-de-Calais (France) (ANTOINE ET AL: 2014). In several recent publications chronological equivalents of this loess but of minor thickness were dated ca. 30 ka in several other Central European loess sections. The project aims at proving meaningful additional evidence in loess of Silesia (Poland) and the Harz foreland (Germany).I hypothesize that a belt with harsh periglacial conditions several thousand years prior to the global LGM is reflected in parts of the Central European loess belt between the Scandinavian and the Alpine Glaciations, in particular in those areas exhibiting high loess sedimentation rates and situated relatively close to the regional maximum of the last Scandinavian glaciation. The proposed pilot project aims at supporting the hypothesis by OSL and IRSL dating from well-stratified key sections in Silesia (Poland), Saxony-Anhalt, as well as from further samples from the Nussloch site. Cooperation with SFB (CRC) 806 (Prof. F. Lehmkuhl) is agreed. In case of successful results obtained from this pilot project regional extension of this research to farther eastern Central European loess sections is envisaged for a following project.

末次（Weichselian）冰川的勃兰登堡/莱什诺阶段代表了德国东北部和波兰西部地区末次盛冰期（LGM）。由于最近的 OSL 测年和地貌结果表明 MIS 3 年龄可能较晚（30 至最大 34 ka），因此该区域末次盛会可能比全球末次盛会早 10 ka。继 HUGHES 等人的全球 LGM 审查之后。 (2013) 在将冰盾的最大区域范围与全球冰量 (MIS) 代理相关联时，建议更加谨慎。如果出现 MIS 3 晚期区域性末次盛冰期，预计会出现一个具有严酷冰缘条件的毗邻带，对此已经找到了第一个证据：厚达 6 m 的黄土，具有典型的连冰期特征，OSL 年龄在约 100 到 100 之间。最近在著名的努斯洛赫剖面（德国）检测到了 29 和 35 ka，并且大约有 29 ka 和 35 ka。 2 m 厚的黄土层，年代约为最近在法国加莱海峡省的 Havringcourt 发表了 28 和 33 ka 的大型冰脉模型网络（ANTOINE 等：2014）。在最近的几篇出版物中，这种黄土的按时间顺序排列的等价物但厚度较小，其日期为约。其他几个中欧黄土地段的 30 ka。该项目旨在证明西里西亚（波兰）和哈茨山前陆（德国）黄土中有意义的额外证据。我假设中欧黄土带的部分地区反映了全球末次盛冰期前几千年的严酷冰缘条件带。斯堪的纳维亚冰川和高山冰川之间的区域，特别是黄土沉积率较高且相对接近最后一次斯堪的纳维亚冰川作用区域最大值的地区。拟议的试点项目旨在支持 OSL 和 IRSL 的假设，这些数据来自西里西亚（波兰）、萨克森-安哈尔特州的分层良好的关键部分，以及来自努斯洛赫遗址的更多样本。已同意与 SFB (CRC) 806（F. Lehmkuhl 教授）合作。如果该试点项目取得成功，预计在下一个项目中将这项研究扩展到更远的中欧东部黄土地区。