The boulder fields of Mt. Fulufjället, west-central Sweden ― Late Weichselian boulder blankets and interstadial periglacial phenomena
The boulder fields of Mt. Fulufjället, west-central Sweden ― Late Weichselian boulder blankets and interstadial periglacial phenomena
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瑞典中西部 Fulufjället 山的巨石场——晚魏希瑟勒巨石覆盖层和冰缘现象
DOI：
10.1080/04353676.1990.11880301
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发表时间：
1990
影响因子：
1.5
通讯作者：
Ingmar Borgström
中科院分区：
文献类型：
--
作者：
J. Kleman;Ingmar Borgström
对 Fulufjället 高原上巨石场的详细形态分析揭示了三种形态和遗传上不同的巨石场类型； 1/ 与冰冻有关的巨石洼地，2/ 巨石覆盖层，即冰川搬运的巨石块，以及 3/ 现场被霜冻破碎的碎片。两种截然不同的景观类型与类型 1 和类型 2 的巨石场相关。在景观类型之间的边界，可以表明巨石凹陷和相关的图案地面在最后一个覆盖冰盖之前就已经存在，因此属于前魏希塞尔时代。冰川搬运的巨石覆盖层中发现的物质主要来自巨石凹陷。从巨石凹陷处拉出的“尾巴”被解释为与冰盖冷基区和暖基区之间的横向剪切带有关。全新世期间，高原上似乎没有发育出大规模的冰缘形态。尽管在魏希瑟利晚期完全被冰覆盖，但超过 60 平方公里的冰缘地貌几乎没有发生任何变化。
Detailed morphological analysis of the boulder fields on the Mt. Fulufjället plateau has revealed three morphologically and genetically different boulder field types; 1/ boulder depressions related to upfreezing in till, 2/ boulder blankets, i.e. glacially transported boulder masses, and 3/ frost-shattered debris in situ. Two distinctly different landscape types are related to the boulder fields of type 1 and 2. At the border between landscape types it can be shown that the boulder depressions and the associated patterned ground were in existence before the last overriding ice sheet, and consequetly are of a pre-Late Weichselian age. The material found in the glacially transported boulder blankets is shown mainly to be derived from boulder depressions. Drawn-out “tails” from boulder depressions are interpreted to be related to lateral shear zones between cold- and warm based zones of the ice sheet. No large-scale periglacial forms appear to have developed on the plateau during the Holocene. An area of more than 60 km2of an interstadial periglacial landscape has survived virtually unchanged despite complete ice cover during the late Weichselian.