科拉半岛北部(俄罗斯西北部)的冰缘山脊地貌群:形态、结构和遗传解释

IF 1.3 4区 地球科学 Q2 GEOLOGY
A. Vashkov, O. Nosova
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引用次数: 0

摘要

科拉半岛东北部的最后一次冰盖形成了一个广泛分布的山脊地貌群。该综合体属于东北部芬诺斯坎迪亚冰原冰流的冰缘地貌。通过应用形态计量研究技术(包括数字高程模型分析),可以确定山脊地貌复合体是一个亚纵向带。该带包括正面和径向山脊、山脊带远端部分的山丘以及复杂形状的山脊。我们在八个露头和坑道中对这些地貌进行了研究。正面山脊和一些复杂形状的山脊是由东向和北向推进的冰川所形成的基底和消融堆积物以及冰川流积物组成的。由冰川流沉积物组成的放射状山脊为山脊。冰川流沉积物上覆盖着薄薄的消融和流动堆积物,形成了冰川带远端部分的山脊。它们标志着各个冰川阶段冰川扩张的界限。一些形状复杂的山脊仅由消融融出的砾石组成,形成于死冰丘陵的裂缝中。这种复杂的冰脊地貌与瑞典北部的维基冰碛、芬兰的普尔朱冰碛以及北美洲的 "冰墙湖平原 "的冰脊在形态上有相似之处。冰碛山脊地貌的位置受晶体基岩地形的控制。在上一次冰川期,冰川退缩分为几个阶段,以冰碛脊地貌带为标志。每个阶段之后都会出现一系列与前冰碛脊链相对应的振荡。根据科拉和卡累利阿地区其他地方的冰缘地貌的相关性,作者将其归入涅瓦阶段(其他名称有 Keiva I、Syamozero),该阶段发生在老干冰期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ice-marginal ridge relief complex in northern Kola Peninsula (NW Russia): morphology, structure, and genetic interpretation
A widely spread ridge relief complex was formed by the last ice cover in the northeastern part of the Kola Peninsula. The complex belongs to the ice-marginal formations of the ice streams of the north-eastern Fennoscandian Ice Sheet. The applied morphometric research technique (including the analysis of the digital elevation model) has allowed identifying the ridge relief complex to make a sub-longitudinal belt. The belt comprises frontal and radial ridges, ridges and hills of the distal part of the belt, and complex-shaped ridges. These landforms were studied in eight outcrops and trenches. The frontal and some complex-shaped ridges consist of basal and ablation tills and glaciofluvial deposits deformed by the east- and north-eastward advancing glacier. The radial ridges composed of glaciofluvial sediments are the eskers. Glaciofluvial deposits with a thin cover of ablation and flow tills form the ridges on the distal part of the belt. They mark the limits of glacier expansion at an individual glacial stage. Some complex-shaped ridges are composed only of the ablation melt-out till and formed in crevasses of dead ice massifs. The ridge relief complex shows morphological similarities with the Veiki moraine in North Sweden, Pulju moraine in Finland, and ridges of the “ice-walled-lake plains” in North America. The location of the moraine ridge landforms is controlled by the topography of crystalline bedrock. During the last glaciation, the glacier retreated in several stages marked by belts of the ridge landforms. Each stage was followed by a series of oscillations corresponding to chains of frontal moraine ridges. The correlation of the ice-marginal forms in other parts of the Kola and Karelia regions allows the authors to refer them to the Neva Stage (other names are Keiva I, Syamozero), which took place in the Older Dryas Stadial.
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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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