花岗岩半岛(波罗的海,博恩霍尔姆岛,哈默伦)上的风化沙覆盖层在过去 11 600 年间分三次形成

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2024-10-16 DOI:10.1016/j.aeolia.2024.100944
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引用次数: 0

摘要

在波罗的海博恩霍尔姆岛(Bornholm)最北端的花岗岩半岛哈默伦(Hammeren)上,有很大一部分地区都覆盖着风化沙。哈默伦半岛的海岸线多岩石,除了东海岸有一个相对宽阔的袋状沙滩外,只有几个小的砾质袋状沙滩。风化沉积物形成了三个沙层,从哈默伦的东海岸和西北海岸向内陆延伸。最大的沙层形成了一个隆起的沙原,覆盖了内陆 700 米的花岗岩地貌,最高处达海拔 60 米。历史资料提到,在小冰河时期中期,即公元 1775 年左右曾出现过风沙运动,但在本研究之前,还没有绝对的年代对照来证实这些观察结果。对选定样本地点进行的荧光测年表明,风沙运动分为三个阶段。第一段发生在小干纪末,约公元前 11500 年;第二段发生在丹麦青铜时代晚期,约公元前 2700 年;最年轻的一段发生在小冰河时期,约公元前 200 年(公元 1750 年)。这些有风化活动的事件都发生在相对寒冷的气候间歇期,为之前的研究提供了支持,这些研究表明寒冷气候与西北欧(包括波罗的海南部地区)风暴增加之间存在联系。
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Aeolian sand cover on a granite peninsula (Hammeren, Bornholm, Baltic Sea) formed in three episodes during the past 11,600 years
Aeolian sand covers a significant part of the granite peninsula Hammeren on northernmost Bornholm in the Baltic Sea. The coastline of Hammeren is rocky and apart from one relative wide and sandy pocket beach at the east coast only few, small and gravelly pocket beaches exist. The aeolian deposits form three sand covers that stretch inland from the east and northwestern facing coasts of Hammeren. The largest sand cover forms a rising sand plain that cover the granitic landscape up to 700 m inland and reaches up to 60 m above sea level. Historical sources mention aeolian sand movement around CE 1775 in the middle of the Little Ice Age, but until this study no absolute age control has been available to confirm these observations. Luminescence dating of selected sample sites indicates that aeolian sand movement took place in three episodes. The first episode was in the last part of the Younger Dryas at about 11,500 BP, the second episode was in the Danish Late Bronze Age at about 2700 BP, and the youngest episode was indeed during the Little Ice Age around 200 BP (CE 1750). These episodes with aeolian activity all fall during relatively cold climatic intervals and add support to previous studies indicating a link between cold climates an increased storminess in Northwest Europe including the southern Baltic Sea region.
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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
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