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| Titel |
Maskevarri Ráhppát in Finnmark, northern Norway – is it an earthquake-induced landform complex? |
| VerfasserIn |
R. Sutinen, I. Aro, P. Närhi, M. Piekkari, M. Middleton |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 2 ; Nr. 5, no. 2 (2014-07-21), S.683-691 |
| Datensatznummer |
250115318
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| Publikation (Nr.) |
 copernicus.org/se-5-683-2014.pdf |
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| Zusammenfassung |
| The Sami word ráhppát means rough bouldery/stony terrain
with sharp-relief topography in Finnmark, northern Norway.
Ráhppát is a common name in the region of the Younger Dryas
landforms, yet the origin of ráhppát has remained obscure.
The timing of the Younger Dryas is concomitant with the maximum neotectonic
fault instability in Fennoscandia. Hence, earthquake activity may have been
one of the contributing factors for the Younger Dryas morphologies.
Ráhppát on the Maskevarri fell, classified as a part of
Tromsø-Lyngen sub-stage of the Younger Dryas, was studied by means of
geomorphology and measurements of electrical-sedimentary anisotropy.
Ráhppát was found to be built up of an anastomosing network
of stony esker-like ridges and mounds bordered with arch-shaped and
sinusoidal ridges. These bordering ridges exhibit sedimentary (azimuthal soil
electrical conductivity) anisotropy parallel-to-ridge trends and were
interconnected to meltwater gullies suggesting generation through short-lived
conduit infills. We did not find electrical-sedimentary evidence to support
the concept of englacial thrusting and/or compression, often described for
Younger Dryas moraines. Maskevarri Ráhppát is typified by ~ 500
ponds and small lakes on three different elevations descending in an up-ice
direction. These may have generated through late glacial earthquake(s) also
contributing to subglacial deformation of Maskevarri Ráhppát. |
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