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Post-sedimentary Transformation of Lateral Moraines——the Tributary Tongue Basins of the Kvíárjkull(Iceland)

Journal of Mountain Science 2008年第1期5卷 1-16页

作者： lasafam iturrizaga Institute of Geography/High Mountain Geomorpholog Goldschmidtstr.537077 GttingenGermany

The Kvíárjokull,a southern outlet glacier of the Vatnajokull,is confined in the mountain foreland by lateral moraines measuring a height of up to 150 m. Each of the lateral moraines shows considerable breaches with deviations of the main moraine ridges. The paper discusses the possible origins of these modifications of the lateral moraines as result of： 1） ice overlappings during glacier advances and subsequent breaches of the lateral moraine,2） bifurcations of the Kvíárjokull glacier tongue triggered by the preglacial relief conditions and the prehistorical moraine landscape leading to afflux conditions,3） drainage of ice-marginal glacier lakes and 4. volcanic activities,such as lava flows and volcanic-induced jokulhlaups. A historic-genetic model of the formation of the lateral moraines is presented considering the breaches in the lateral moraines as result from glacier bifurcations and therefore as former tributary tongue basins. Such breaches in the lateral moraines are also common landscape features at glaciers outside of Iceland and are from wider importance for the paleoreconstruction of former glacier stages. The knowledge of their development is essential for an adequate relative age classification of individual moraine ridges. In regard to the origin of the debris supply areas of the large-sized Kvíárjokull moraines,the resedimentation of prehistoric till deposits by younger glacier advances plays a role in the formation of the lateral moraines apart from englacial and supraglacial sediment transfer processes.

关键词： lateral moraines tributary tongue basin glacier bifurcation glacier lake outburst Kvíárjokull

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In Memoriam: Matthias Kuhle

引用

Journal of Mountain Science 2015年第5期12卷 1065-1067页

作者： lasafam iturrizaga Hermann KREUTZMANN Kenneth HEWITT LIU Shiyin Monique FORT Section of Geography and High Mountain Geomorphology Institute of Geography University of Goettingen Centre for Development Studies Geographic Sciences Freie Universitaet Berlin Cold Regions Research Centre Wilfrid Laurier University Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Department of Geography CNRS PRODIG University Paris Diderot SPC

Matthias Kuhle,an internationally renowned physical geographer and highly respected geomorphologist,died tragically on the 25th of April,*** was in the Manaslu Himalaya,close to the epicentre of April 2015 Nepal earth... 详细信息

关键词：埃及地理学家喜马拉雅科学家尼泊尔十五地震

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