Investigations of polygonal patterned ground in continuous Antarctic permafrost by means of ground penetrating radar and electrical resistivity tomography: Some unexpected correlations

IF 3 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Permafrost and Periglacial Processes Pub Date : 2022-06-07 DOI:10.1002/ppp.2156

E. Forte, H. French, R. Raffi, I. Santin, M. Guglielmin

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引用次数: 2

Abstract

The results of a combined geophysical and geomorphological investigation of thermal‐contraction‐crack polygons near Gondwana station (Germany) in northern Victoria Land (Antarctica) are reported. An area of about 20,000 m2 characterized by random orthogonal polygons was investigated using integrated ground penetrating radar, electrical resistivity tomography, geomorphological surveys, and two trench excavations. The polygons are well developed only at elevations higher than 6–7 m above current sea level on Holocene‐age raised beaches. It is concluded that the polygons are composite in nature because the shallow linear depressions that outline the polygons are underlain by fissures that can contain both sandy gravel and foliated ice (i.e., ice wedges) even in the same polygon network and at distances of just a few meters. Unexpectedly, most of the polygons follow the border of the raised beaches and develop in correspondence with stratigraphic layers dipping toward the sea, imaged by ground penetrating radar (GPR) profiles and interpreted as prograding layers toward the present‐day shoreline.

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利用探地雷达和电阻率层析成像技术对连续南极多年冻土带多边形地形的研究:一些意想不到的相关性

报道了在南极洲维多利亚地北部冈瓦纳站(德国)附近对热收缩裂缝多边形进行的地球物理和地貌联合调查的结果。通过综合探地雷达、电阻率层析成像、地貌测量和两次沟渠挖掘，研究了以随机正交多边形为特征的约20,000 m2区域。在全新世时代的凸起海滩上，只有海拔高于当前海平面6-7米的地方才发育得很好。结论是，这些多边形本质上是复合的，因为勾勒出多边形轮廓的浅线性洼地被裂缝所覆盖，这些裂缝既可以包含砂砾，也可以包含片理冰(即冰楔)，即使在同一个多边形网络中，距离只有几米。出乎意料的是，大多数多边形沿着凸起的海滩的边界发育，并与向海倾斜的地层相对应，由探地雷达(GPR)剖面成像，并被解释为向当今海岸线前进的层。

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来源期刊

Permafrost and Periglacial Processes 地学-地质学

CiteScore

9.70

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.

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