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

末次(Weichselian)冰期的Brandenburg/Leszno阶段代表了德国东北部和波兰西部的区域末次冰期(LGM)。由于最近的OSL测年和地貌结果表明有可能是MIS3晚期(30到最大。34 ka)看来，这一区域末次盛冰期可能比全球末次盛冰期早10ka。在全球范围内对休斯等人进行LGM审查之后。(2013)在将冰盖的最大区域延伸与全球冰量的替代物(MIS)相关联时，建议更加谨慎。对于晚期的MIS3区域LGM，预计会有一个具有严酷冰缘条件的毗邻带，这是已经发现的第一个证据：最近在著名的Nussloch剖面(德国)发现了厚达6米的典型全冰川生境的黄土，其OSL年龄在约29至35ka之间，而在约28至33ka之间的约2米厚的黄土层与宏伟的冰脉铸件网络最近在法国Pas-de-Calais的HavringCourt被发表(Antoine et AL：2014)。在最近的几个出版物中，这种厚度较小的黄土的年代等价物在其他几个中欧黄土剖面中被测得约30ka。该项目的目的是在西里西亚(波兰)和哈尔茨前陆(德国)的黄土中证明有意义的额外证据。我假设，在全球末次盛冰期之前数千年具有恶劣冰缘条件的带反映在斯堪的纳维亚和阿尔卑斯山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且相对接近最后一次斯堪的纳维亚冰川的区域最大值的地区。拟议的试点项目旨在通过OSL和IRSL对西里西亚(波兰)、萨克森-安哈尔特的分层良好的关键地段以及Nussloch遗址的更多样品进行测年来支持这一假设。同意与SFB(CRC)806(F.Lehmkuhl教授)合作。如果这一试点项目取得了成功的结果，预计下一个项目将把这项研究的区域扩展到更远的中东欧黄土地段。

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.