Pingos and mardels: high-resolution digital terrain models suggest meteorite impact craters in addition to permafrost, sinkhole and dead-ice formation models.
Kord Ernstson1 and Jens Poßekel2
Abstract. – With the meanwhile widely available data of Digital Terrain Models (DTM) with extremely high resolution of the bare terrain surface, vertically and horizontally, down to the decimeter and centimeter range and freed from buildings and any vegetation, completely new possibilities have opened up in the geosciences, which entail paradigm shifts in established ideas and textbook wisdom. Such a paradigm shift is especially indicated in ice age research and more generally in the still open discussion of the formation of smaller terrain forms in the manner of general and diverse depressions. With the new possibilities of the DTM a new “contender” has entered the discussion, which was already considered as a cause sporadically in former times, since relatively short time with the extreme terrain resolution of the DTM has led to completely new ways of consideration. This article reports about it with the finding that impact craters may be the more reasonable explanation for previously assumed pingos, mardels in the general sense, and dead ice holes.
Keywords: Pingo, mardel, sinkhole, dead ice hole, meteorite crater, impact crater strewn field, impact airburst
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1University of Würzburg, D-97074 Würzburg, Germany, kernstson@ernstson.de; 2Geophysik Poßekel Mülheim, Germany, jens.possekel@cityweb.de.
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1 Introduction
Pingos are mounds of earth formed in permafrost. The interior of the mound consists of an ice core, and they have a circular or oval shape and can reach a diameter of up to several hundred meters and a height of up to several dekameters. When the ice core melts, the pingo collapses and forms a depression in the ground called a pingo ruin. A common explanation of ice core formation is artesian rising warmer waters in the permafrost, which freeze there and are successively pushed further and further up as a massive core.
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