Late Holocene syngenetic ice-wedge polygons development, Bylot Island, Canadian Arctic Archipelago
Late Holocene syngenetic ice-wedge polygons development, Bylot Island, Canadian Arctic Archipelago
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DOI：
10.1139/e04-031
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发表时间：
2004-08-01
影响因子：
1.4
通讯作者：
Allard, M
中科院分区：
文献类型：
--
作者：
Fortier, D;Allard, M
距今 6000 年后在 C-79 冰川冲积平原上形成的同生冰楔多边形的初始结构，因距今 3670+/-110 年后开始的风吹沉积物和有机沉积物的积累而发生了改变。全新世晚期沉积导致土壤热收缩系数增加并形成三级和四级收缩裂缝，部分解释了多边形网络的当前配置。冰楔边缘沉积地层的上翘与夏季热膨胀以及由此产生的土壤内部蠕变有关。千年尺度年平均土壤位移系数约为2.5～2.7×10(-5)/℃。多边形中心下方的全新世晚期沉积地层未受干扰，这使得可以在进一步的研究中使用该沉积记录来尝试从岩心重建古环境。
The initial configuration of the syngenetic ice-wedge polygons that developed in the outwash plain of glacier C-79 after 6000 BP was modified by the accumulation of wind-blown and organic sediments that began after 3670 +/- 110 BP. The late Holocene sedimentation led to an increase in the thermal contraction coefficient of the soil and the formation of third- and fourth-order contraction cracks, partially explaining the current configuration of the polygonal network. The upturning of the sedimentary strata bordering the ice wedges was associated with the summer thermal expansion and resulting internal creep of the soil. The mean annual soil displacement coefficient was in the order of 2.5-2.7 x 10(-5)/degreesC at the thousand-year scale. The late Holocene sedimentary strata under the centre of the polygons were undisturbed, which will make it possible to use this sedimentary record in further studies to attempt paleoenvironmental reconstructions from cores.