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.

末次冰期（Weichselian）的勃兰登堡/莱兹诺期代表了德国东北部和波兰西部的区域末次冰期盛期（LGM）。由于最近的光释光测年和地貌结果表明，晚MIS 3年龄（30至最大值）的可能性。34 ka），似乎该区域LGM可能早于全球LGM高达10 ka。根据HUGHES等人（2013年）的全球LGM审查，在将冰盾的最大区域延伸与全球冰量（MIS）代理相关联时，应更加谨慎。在MIS 3晚期区域LGM的情况下，预计会出现具有恶劣冰缘条件的相邻带，对此已经发现了第一个证据：典型的pleniglacial habitus的厚达6 m的黄土，OSL年龄在约1000年至约1000年之间。最近在著名的Nussloch剖面（德国）发现了29和35 ka的古地磁活动，并在该剖面上发现了一个约2.5 ka的古地磁活动。2米厚的黄土层，年代约在28和33 ka与一个宏伟的网络冰静脉铸件最近发表了从Havringcourt，Pas-de-加莱（法国）（安托万等：2014）。在最近的几篇出版物中，这种黄土的年代学等价物，但厚度较小，其年代约为1980年。30 ka在其他几个中欧黄土剖面。该项目旨在证明西里西亚（波兰）和哈茨前陆（德国）黄土中有意义的额外证据。我假设，在全球末次冰期之前几千年，一个具有恶劣冰缘条件的带反映在斯堪的纳维亚和阿尔卑斯冰川之间的中欧黄土带的部分地区，特别是在那些黄土沉积速率高的地区，以及相对接近斯堪的纳维亚末次冰期的区域最大值的地区。拟议的试点项目的目的是支持假设的OSL和IRSL测年良好分层的关键部分在西里西亚（波兰），萨克森-安哈尔特州，以及从Nussloch网站的进一步样本。与SFB（CRC）806（F. Lehmkuhl）表示同意。如果从该试点项目中获得成功的结果，则设想将该研究区域扩展到更远的中欧东部黄土剖面，用于下一个项目。