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Processes controlling the development of talus slopes in SW Spitsbergen: The role of deglaciation and periglacial conditions
Land Degradation & Development ( IF 4.7 ) Pub Date : 2020-07-04 , DOI: 10.1002/ldr.3716
Krzysztof Senderak 1 , Marta Kondracka 1 , Bogdan Gądek 1
Affiliation  

The location of Svalbard at the interface between the warm Atlantic and cold Arctic oceans causes the terrestrial environment to be highly sensitive to contemporary climate warming. Talus slopes provide a component of glaciated areas that has been registering these changes on a scale of several thousand years. However, knowledge about their development during glacial recession is still limited. This paper fills this gap by providing unique data obtained by geophysical methods: electrical resistivity tomography (ERT) and ground‐penetrating radar (GPR), regarding the talus slopes in Revdalen (SW Spitsbergen), which was last glaciated in the Neoglacial period. The results indicate that the thickness of talus slopes depends first of all on the size of the sediment supply area and only secondarily on the stage of development. The initial content of buried glacial ice in the talus deposits is differential and depends on both the rate of deglaciation and the local intensity of rock wall denudation. Over time, as a result of creep, the presence of massive ice is limited to ever lower parts of the slope. Above, there is aggradation of pore ice in delivered debris material. At the end of this stage, the buried glacial ice can form, or co‐create together with pore ice, the core of subslope rock glaciers. The relatively long period since the beginning of the Revdalen deglaciation allowed a general model of the development of talus slopes in the polar environment to be prepared.

中文翻译:

控制斯匹次卑尔根西南距骨斜坡发展的过程:冰消作用和冰缘条件的作用

斯瓦尔巴群岛在大西洋和北冰洋之间的交界处,使陆地环境对当代气候变暖高度敏感。距骨斜坡提供了冰川地区的一部分,这些地区已经记录了几千年的变化。但是,关于它们在冰川衰退期间的发育的知识仍然有限。本文提供了通过地球物理方法获得的独特数据来填补这一空白:电阻层析成像(ERT)和探地雷达(GPR),涉及Revdalen(SW Spitsbergen)的距骨坡度,这是在新冰期最后一次冰川期。结果表明,距骨斜坡的厚度首先取决于沉积物供应区域的大小,其次仅取决于发育阶段。距骨沉积物中埋藏的冰川冰的初始含量是不同的,并且取决于脱冰速率和岩壁剥蚀的局部强度。随着时间的流逝,由于蠕变,大量冰块的存在仅限于斜坡的下部。上方,所输送的碎屑材料中有孔隙冰凝结。在此阶段结束时,埋藏的冰川冰可以与亚坡岩冰川的核心孔隙冰一起形成或共同形成。自从Revdalen的冰消作用开始以来,相对较长的时间允许准备极性环境中距骨坡度发展的一般模型。大块冰的存在仅限于斜坡的下部。上方,所输送的碎屑材料中有孔隙冰凝结。在此阶段结束时,埋藏的冰川冰可以与亚坡岩冰川的核心孔隙冰一起形成或共同形成。自从Revdalen的冰消作用开始以来,相对较长的时间允许准备极性环境中距骨坡度发展的一般模型。大块冰的存在仅限于斜坡的下部。上方,所输送的碎屑材料中有孔隙冰凝结。在此阶段结束时,埋藏的冰川冰可以与亚坡岩冰川的核心孔隙冰一起形成或共同形成。自从Revdalen的冰消作用开始以来,相对较长的时间允许准备极性环境中距骨坡度发展的一般模型。
更新日期:2020-07-04
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