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Unusual features caused by lightning impact in West Greenland
Geological Survey of Denmark and Greenland.
Geophysical Laboratory, Aarhus University.
Geological Survey of Denmark and Greenland.ORCID iD: 0000-0002-1629-2920
2006 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 143, no 5, p. 737-741Article in journal (Refereed) Published
Abstract [en]

Two lightning impacts are described from an area near the Inland Ice in West Greenland. The first lightning blasted an outcrop of metacherts. It subsequently split into two branches, which traversed rock outcrops and boulders, leaving behind two white almost straight lines, 30 m and 14 m long, respectively, where all lichens and plants were burned away. On the white lines the upper few millimetres of the traversed boulders were melted to a glass which subsequently peeled off by thermal expansion to leave a rough surface. Magnetic investigation of an amphibolite boulder found on the white line showed that a strong electric current indeed traversed the boulder. A few years later a second lightning impacted on a mountaintop close to the first impact. The second lightning left a trail on the rock surface covered by a thin layer of glass. The glass displays spectacular colours ranging from metallic blue to red, yellow and green.

Place, publisher, year, edition, pages
Cambridge University Press, 2006. Vol. 143, no 5, p. 737-741
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-67097DOI: 10.1017/S0016756806002391Scopus ID: 2-s2.0-33748305984OAI: oai:DiVA.org:ltu-67097DiVA, id: diva2:1168595
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2017-12-21Bibliographically approved

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Rasmussen, Thorkild Maack
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