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dc.contributor.authorPoelchau, M. H.
dc.contributor.authorKenkmann, T.
dc.date.accessioned2021-02-12T22:31:24Z
dc.date.available2021-02-12T22:31:24Z
dc.date.issued2008-01-01
dc.identifier.citationPoelchau, M. H., & Kenkmann, T. (2008). Asymmetric signatures in simple craters as an indicator for an oblique impact direction. Meteoritics & Planetary Science, 43(12), 2059-2072.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2008.tb00661.x
dc.identifier.urihttp://hdl.handle.net/10150/656508
dc.description.abstractIn oblique impacts with an impact angle under 45 degrees, the bilateral shape of the distal ejecta blanket is used as the strongest indicator for an impact vector. This bilateral symmetry is attenuated and is superimposed by radial symmetry towards the crater rim, which remains circular for impact angles down to 10-15 degrees. The possibility that remnants of bilateral symmetry might still be present in the most proximal ejecta, the overturned flap and the crater rim was explored with the intention of deducing an impact vector. A model is presented that postulates bilateral patterns using proximal ejecta trajectories and predicts these patterns in the orientation of bedding planes in the crater rim. This model was successfully correlated to patterns described by radial grooves in the proximal ejecta blanket of the oblique Tooting crater on Mars. A new method was developed to detect structural asymmetries by converting bedding data into values that express the deviation from concentric strike orientation in the crater rim relative to the crater center, termed "concentric deviation." The method was applied to field data from Wolfe Creek crater, Western Australia. Bedding in the overturned flap implies an impactor striking from the east, which refines earlier publications, while bedding from the inner rim shows a correlation with the crater rim morphology.
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.subjectoblique Impact
dc.subjectWolfe Creek Impact Crater
dc.subjectWestern Australia
dc.subjectimpact structures
dc.subjectimpact ejecta
dc.titleAsymmetric signatures in simple craters as an indicator for an oblique impact direction
dc.typeArticle
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.volume43
dc.source.issue12
dc.source.beginpage2059
dc.source.endpage2072
refterms.dateFOA2021-02-12T22:31:24Z


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