芬兰南部波罗的海冰湖排水事件的形态地层印记

IF 1.3 4区 地球科学 Q2 GEOLOGY
J. Lunkka
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引用次数: 0

摘要

基于激光扫描图像(LiDAR-DEM)和探地雷达(GPR)数据的数字高程模型,研究了芬兰南部新仙女木Salpausselkä终碛带的冰川-河流吉尔伯特型冰接触三角洲。分析的地貌数据用于重建冰川晚期波罗的海冰湖到全新世早期约尔迪亚海的水位下降,并将这些变化与更广泛的地层背景联系起来。结果表明,11 650 calyrs BP左右的突发性降水事件不仅在芬兰南部第二Salpausselkä带的破碎沉积物上留下了印记,而且在冰接触冰川河流三角洲上也留下了印记。这种形态-地层界线可以放置在两个不同层次的冰接触三角洲发生的位置;高水位三角洲形成于波罗的海冰湖B III水位阶段,低水位三角洲形成于约迪亚海Y I水位阶段。芬兰南部的这个形态地层边界标志着芬兰南部更新世/全新世的年代地层边界,并显示了斯堪的纳维亚冰盖的芬兰湖区冰瓣和波罗的海冰瓣的相应位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The morphostratigraphic imprint of the Baltic Ice Lake drainage event in southern Finland
Digital elevation models, based on laser scanning imageries (LiDAR-DEM) and aided by ground penetrating radar (GPR) data, were used to study glaciofluvial Gilbert-type ice-contact deltas in the Younger Dryas Salpausselkä end-moraine zone in southern Finland. The geomorphological data analysed were used to reconstruct the water-level drop of the late glacial Baltic Ice Lake to the early Holocene Yoldia Sea and tie these changes to a wider stratigraphic context. The results indicate that the sudden drainage event at around 11 650 cal. yrs BP left its imprint not only on the varved sediments but also on ice-contact glaciofluvial deltas in the Second Salpausselkä zone throughout southern Finland. This morphostratigraphic boundary can be placed at locations where the ice-contact deltas occur at two different levels; the higher-level deltas formed during the Baltic Ice Lake B III water-level stage and the lower-level deltas during the Yoldia Sea Y I water-level stage. This morphostratigraphically defined boundary in southern Finland marks the Pleistocene/Holocene chronostratigraphic boundary in southern Finland and shows the corresponding positions of the Scandinavian Ice Sheet’s Finnish Lake District Ice Lobe and the Baltic Sea Ice Lobe.
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来源期刊
CiteScore
1.30
自引率
0.00%
发文量
5
审稿时长
>12 weeks
期刊介绍: Bulletin of the Geological Society of Finland (BGSF) publishes research articles and short communications in all branches of geosciences. Contributions from outside Finland are welcome, provided that they contain material relevant to Finnish geology or are of general interest.
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