Evidence for an Extreme Cooling Event Prior to the Laschamp Geomagnetic Excursion in Eifel Maar Sediments

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-02-12 DOI:10.3390/quat6010014
Johannes Albert, F. Sirocko
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引用次数: 1

Abstract

We present a timeseries of flood and slumping phases in central Europe for the past 65,000 years from event layers in sediment cores from infilled Eifel maar basins (Germany). Palynological, petrographic and organic carbon (chlorins) records are used to understand the precise timing of these events. Periods of increased flood activity seem to coincide with Heinrich stadials in marine sediment records, which are associated with cold and more arid climate conditions, indicating a vegetation response within the maars’ catchment areas. This multi-proxy correlation reveals prominent slumps at different maar sites during Greenland Stadial (GS) 12. The stratigraphy is based on sediment records from the Auel infilled maar and we thus call this event Auel Cold Event (ACE). Frozen and fractured sediment packages within the slump suggest deep frost or permafrost conditions for the region during the stadial. The results agree well with sediment archives and archeological sites across Europe that report severely cold and arid conditions for the stadial. This supports the assumption that GS12 was indeed one of the coldest periods of the last glacial cycle rather than the Heinrich stadials. Based on our age model, the ACE occurred at 43,500 yr b2k (years before the year 2000), which coincides with the initial weakening of Earth’s magnetic field strength prior to the Laschamp geomagnetic excursion.
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Eifel-Maar沉积物中Laschamp地磁偏移之前发生极端冷却事件的证据
我们根据填充Eifel-maar盆地(德国)沉积物岩芯中的事件层,呈现了中欧过去65000年的洪水和滑坡阶段的时间序列。考古、岩相和有机碳(氯)记录用于了解这些事件的精确时间。洪水活动增加的时期似乎与海洋沉积物记录中的海因里希水位一致,这与寒冷和更干旱的气候条件有关,表明马尔集水区内的植被反应。这种多指标相关性揭示了格陵兰国家体育场(GS)12期间不同马尔地点的显著滑坡。地层学基于Auel填充maar的沉积物记录,因此我们将此事件称为Auel冷事件(ACE)。坍落度内的冻结和断裂沉积物包表明,在体育场期间,该地区存在深厚的霜冻或永久冻土条件。这一结果与欧洲各地的沉积物档案和考古遗址非常一致,这些档案和遗址报告了体育场的严寒和干旱条件。这支持了这样一种假设,即GS12确实是上一次冰川周期中最冷的时期之一,而不是海因里希体育场。根据我们的年龄模型,ACE发生在43500年b2k(2000年之前的几年),这与Laschamp地磁偏移之前地球磁场强度的最初减弱相吻合。
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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