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dc.contributor.authorKenkmann, T.
dc.contributor.authorKiebach, F.
dc.contributor.authorRosenau, M.
dc.contributor.authorRaschke, U.
dc.contributor.authorPigowske, A.
dc.contributor.authorMittelhaus, K.
dc.contributor.authorEue, D.
dc.date.accessioned2021-02-12T22:30:27Z
dc.date.available2021-02-12T22:30:27Z
dc.date.issued2007-01-01
dc.identifier.citationKenkmann, T., Kiebach, F., Rosenau, M., Raschke, U., Pigowske, A., Mittelhaus, K., & Eue, D. (2007). Coupled effects of impact and orogeny: Is the marine Lockne crater, Sweden, pristine?. Meteoritics & Planetary Science, 42(11), 1995-2012.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb00556.x
dc.identifier.urihttp://hdl.handle.net/10150/656362
dc.descriptionFrom the proceedings of the Workshop on Impact Craters as Indicators for Planetary Environmental Evolution and Astrobiology held in June 2006 in Östersund, Sweden.
dc.description.abstractOur current understanding of marine-impact cratering processes is partly inferred from the geological structure of the Lockne crater. We present results of a mapping campaign and structural data indicating that this crater is not pristine. In the western part of the crater, pre-impact, impact, and post-impact rocks are incorporated in Caledonian thrust slices and are subjected to folding and faulting. A nappe outlier in the central crater depression is a relic of the Caledonian nappe cover that reached a thickness of more than 5 km. The overthrusted crater is gently deformed. Strike of strata and trend of fold axes deviate from standard Caledonian directions (northeast-southwest). Radially oriented crater depressions, which were previously regarded as marine resurge gullies formed when resurging seawater erosively cut through the crater brim, are interpreted to be open synclines in which resurge deposits were better preserved. The presence of the impact structure influenced orogenesis due to morphological and lithological anomalies of the crater: i) a raised crater brim zone acted as an obstacle during nappe propagation, (ii) the occurrence of a central crater depression caused downward sagging of nappes, and (iii) the lack of an appropriate detachment horizon (alum shale) within the crater led to an enhanced mechanical coupling and internal deformation of the nappe and the overthrusted foreland. Preliminary results of 3-Danalogue experiments suggest that a circular high-friction zone representing the crater locally hinders nappe propagation and initiates a circumferentially striking ramp fault that delineates the crater. Crustal shortening is also partitioned into the crater basement and decreases laterally outward. Deformation of the foreland affected the geometry of the detachment and could be associated with the activation of a deeper detachment horizon beneath the crater. Strain gradients both vertically and horizontally result in non-plane strain deformation in the vicinity of the crater. The strain tensors in the hanging and foot walls may deviate up to 90 degrees from each other and rotated by up to 45 degrees with respect to the standard regional orientation. The observed deflection of strata and fold axes within the Lockne crater area as revealed by field mapping is in agreement with the pattern of strain partitioning shown in the analogue models.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectmarine impact
dc.subjectLockne
dc.subjectCaledonian orogeny
dc.subjectanalogue modeling
dc.titleCoupled effects of impact and orogeny: Is the marine Lockne crater, Sweden, pristine?
dc.typeProceedings
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue11
dc.source.beginpage1995
dc.source.endpage2012
refterms.dateFOA2021-02-12T22:30:27Z


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