Search: id:"swepub:oai:DiVA.org:ltu-20990" >
Lycksele structure ...
-
Thunehed, HansLuleå tekniska universitet
(author)
Lycksele structure in northern Sweden: Result of an impact?
- Article/chapterEnglish2000
Publisher, publication year, extent ...
-
Boulder, Colo :Geological Society of America,2000
-
printrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:ltu-20990
-
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-20990URI
-
https://doi.org/10.1130/0-8137-2339-6.125DOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:vet swepub-contenttype
-
Subject category:kap swepub-publicationtype
Notes
-
Godkänd; 2000; 20070206 (agso)
-
The Lycksele structure in northern Sweden is a large circular structure with a diameter of approximately 130 km. The structure has been defined from a combined analysis of topography, gravity, and magnetic data and is characterized by a circular system of faults, arc-shaped contacts between rocks, a quasi-circular system of downfaulted lowdensity granitic rocks, and an uplift of high-density rocks in the center. On the basis of ages of granite intrusions and a thrust zone that is cut by faults of the ring, together with paleomagnetic data, the age of the structure is between 1.80 and 1.26 Ga. The Bouguer gravity anomaly is similar to that associated with other known large impact structures on Earth. The rim of the structure, defined from the gravity gradients, magnetic data, and topography, is not restricted to specific rock types but cuts regional geologic structures as well as smaller intrusions, which may be expected for an impact structure in Precambrian deformed target rocks. Therefore, an impact origin seems most plausible for this structure, but to confirm this idea we need identifications of shock metamorphic features in the rocks.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Elming, Sten-ÅkeLuleå tekniska universitet,Geovetenskap och miljöteknik(Swepub:ltu)sael
(author)
-
Pesonen, Lauri J.Laboratory for Palaeomagnetism, Geological Survey of Finland, Espoo, Finland
(author)
-
Luleå tekniska universitetGeovetenskap och miljöteknik
(creator_code:org_t)
Related titles
-
In:Large meteorite impacts and planetary evolution IIBoulder, Colo : Geological Society of America, s. 125-300813723396
Internet link
Find in a library
To the university's database