New age constraints from the SW Baltic Sea area – implications for Scandinavian Ice Sheet dynamics and palaeo‐environmental conditions during MIS 3 and early MIS 2

New age constraints from the SW Baltic Sea area – implications for Scandinavian Ice Sheet dynamics and palaeo‐environmental conditions during MIS 3 and early MIS 2
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波罗的海西南部地区的新年龄限制——对 MIS 3 和早期 MIS 2 期间斯堪的纳维亚冰盖动态和古环境条件的影响

DOI:
10.1111/bor.12206
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发表时间:
--
期刊:
影响因子:
2.2
通讯作者:
Hüneke
Hüneke
中科院分区:
地球科学3区
文献类型:
--
作者:
Kenzler;Tsukamoto;Frechen;Hüneke

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来自Jasmund半岛的两个悬崖露头的研究提供了新的信息,在MIS 3和随后的过渡到MIS 2在波罗的海西南部地区的冰盖动力学和古环境条件。我们确定了间stadial河流沉积物,软体动物和脊椎动物区系,这是沉积在47和42 ka之间的草原状景观。随后的冷却阶段导致了冰前湖的形成,在30和22 ka之间,由纹状的,有节奏的层状粉质粘土表示。这一冰前湖的形成可以与波罗的海盆地的卡特加特冰前进,以前日期为。29-26 ka。从冰前到冰末湖泊沉积的过渡反映了从MIS 3到MIS 2早期过渡后,斯堪的纳维亚冰盖(SIS)立即进入研究区域。SIS最终在23±2 ka(勃兰登堡阶段;从东北推进)到达该地区。随后的冰退缩伴随着融水沉积物的沉积,随后是SIS的重新推进,导致整个研究区域的冰川构造变形事件。我们研究的年龄控制基于光激发光(OSL)。研究的更新世沉积物显示,MIS 3和MIS 2早期的无冰条件,表明Ristinge和Klintholm推进都没有到达Jasmund的波罗的海西南海岸。
The study of two cliff outcrops from the Jasmund Peninsula provides new information on the ice‐sheet dynamics and palaeo‐environmental conditions during MIS 3 and the ensuing transition to MIS 2 in the southwestern Baltic Sea region. We identified interstadial fluvial sediments, with mollusc and vertebrate fauna, which were deposited between 47 and 42 ka in a steppe‐like landscape. A subsequent cooling phase led to the formation of a proglacial lake, between 30 and 22 ka, indicated by varve‐like, rhythmically bedded silty clay. This proglacial lake formation can be correlated to the blocking of the Baltic Basin by the Kattegat ice advance, previously dated toc. 29–26 ka. The transition from proglacial to terminoglacial lacustrine deposits reflects the immediate advance of the Scandinavian Ice Sheet (SIS) into the study area after the transition from MIS 3 to early MIS 2. The SIS finally reached the area at 23±2 ka (Brandenburgian phase; advance from the northeast). A subsequent ice retreat accompanied by the deposition of meltwater sediments was followed by a re‐advance of the SIS, resulting in a glaciotectonic deformation event across the study area. The age control for our study is based on optically stimulated luminescence (OSL). The investigated Pleistocene sediments show ice‐free conditions during MIS 3 and early MIS 2, indicating that neither the Ristinge nor the Klintholm advance reached the SW Baltic Sea coast of Jasmund.
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