File:Nappes near Tornetrask.jpg

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Nappes_near_Tornetrask.jpg ‎(564 × 133 pixels, file size: 38 KB, MIME type: image/jpeg)

Summary

Description
Svenska: Ett schematiskt tvärsnitt genom berggrunden vid Torneträsk som visar hur de olika skollorna (grönt, lila, ljus- och mörkrosa) har skjutits över varandra och ut över urberget (grått), i riktning från nordväst mot sydost som pilarna antyder. Här visar den taggade linjen skollberggrundens överskjutningsyta mot urberget och det ”smörjande” lagret av sedimentära bergarter (gult).


För 400 miljoner år sedan kolliderade vår kontinent med den nordamerikanska och havet som legat mellan dem slöts. Skivor av den forna havsbottnen sköts upp över varandra och vidare över vårt urberg i stora sjok. Dessa skollor försköts upp till tiotals mil och en bergskedja i storlek med dagens Himalaya uppstod.

Efter erosion återstår idag endast rötterna till den en gång så omfattande bergkedjan. Glidplanet mellan urberget och skollorna syns tydligt i fjället Kaisepakte.

Koordinater: Sweref 7583617, 672651
English: Cross-section diagram of the rocks at Torneträsk in Sweden.
Date
Source https://www.flickr.com/photos/geologicalsurveyofsweden/7315768796
Author Benno Kathol, Tomas Renström, SGU

Licensing

This image was originally posted to Flickr by Geological Survey of Sweden at https://flickr.com/photos/55118510@N03/7315768796. It was reviewed on 18 December 2017 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 December 2017

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22 May 2012

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Date/TimeThumbnailDimensionsUserComment
current00:57, 18 December 2017Thumbnail for version as of 00:57, 18 December 2017564 × 133 (38 KB)LappspiraUser created page with UploadWizard
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