Depositional conditions of the Upper Younger Loess during the Last Glacial Maximum in central and eastern Europe

IF 1.1 4区 地球科学 Q3 GEOLOGY
J. Dzierżek, L. Lindner, R. Chlebowski, M. Szymanek, Andriy Bogucki, O. Tomeniuk
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引用次数: 2

Abstract

: Dzierżek, J., Lindner, L., Chlebowski, R., Szymanek, M., Bogucki, A. and Tomeniuk, O. 2022. Depositional conditions of the Upper Younger Loess during the Last Glacial Maximum in central and eastern Europe. Acta Geologica Polonica , 72 (4), 369–389. Warszawa. This paper is a summary of the results of research on the accumulation conditions of the Upper Younger Loess (LMg) in Poland and Bug loess (bg) in Ukraine from the maximum stage (MIS 2) of the Vistulian (Weichselian) Glaciation in central and eastern Europe. These studies included an analysis of the morphological (topographic) situation of the loess cover, its grain size and heavy mineral composition, the preserved structures of loess sed - imentation as well as mollusc and pollen analyses of this loess. They revealed that the accumulation of Upper Younger Loess (UYL) might have been more dependent on the prevailing moisture conditions than previously thought. These conditions could have been caused by cold air masses from an ice sheet and warm air masses from the Mediterranean Sea and Atlantic coming together in the Carpathians and the Holy Cross Mountains and favouring the formation of dust storms and precipitation. In this process, a loading of loess dust (formed from local rocks weathering in periglacial conditions) by atmospheric moisture particles was especially significant. The moist substrate not only favoured the periodic development of vegetation and molluscs but also enabled the interception of dust and the accumulation of an increasingly thick loess cover. Westerly and south-westerly winds predominated in the UYL as indicated by the topographic position of loess patches and the mineral composition of the studied loess. Periodically an increased air circulation from the east and northeast occurred.
末次盛冰期中欧和东欧上新黄土沉积条件
: Dzierżek, J., Lindner, L., Chlebowski, R., Szymanek, M., Bogucki, A.和Tomeniuk, O. 2022。末次盛冰期中欧和东欧上新黄土沉积条件地质学报,72(4),369-389。华沙。本文综述了中欧和东欧维斯图利亚(魏奇塞利亚)冰期最大阶段(MIS 2)以来波兰上年轻黄土(LMg)和乌克兰布格黄土(bg)的成藏条件研究成果。这些研究包括黄土覆盖物的形态(地形)状况、粒度和重矿物组成分析、黄土填充物的保存结构以及该黄土的软体动物和花粉分析。他们揭示了上年轻黄土(UYL)的积累可能比以前认为的更依赖于当时的湿度条件。这些情况可能是由来自冰盖的冷空气团和来自地中海和大西洋的暖气团在喀尔巴阡山脉和圣十字山脉聚集在一起,有利于沙尘暴和降水的形成造成的。在这一过程中,大气湿粒对黄土沙尘(由冰缘条件下局部岩石风化形成)的负荷作用尤为显著。湿润的底物不仅有利于植被和软体动物的周期性发育,而且有利于截流沙尘,使黄土覆盖层的积累越来越厚。黄土斑块的地形位置和研究黄土的矿物组成表明,UYL以西风带和西南风为主。周期性地从东部和东北部增加空气环流。
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来源期刊
Acta Geologica Polonica
Acta Geologica Polonica 地学-地质学
CiteScore
1.70
自引率
18.20%
发文量
0
审稿时长
>12 weeks
期刊介绍: Acta Geologica Polonica publishes original and review papers on all aspects of basic geology, with particular focus on sedimentology, stratigraphy, palaeontology, regional geology, structural geology, and regional petrography. All papers are published in English.
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