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dc.contributor.authorKreslavsky, M. A.
dc.contributor.authorHead, J. W.
dc.date.accessioned2021-02-12T21:41:02Z
dc.date.available2021-02-12T21:41:02Z
dc.date.issued2006-01-01
dc.identifier.citationMeresse, S., Costard, F., Mangold, N., Baratoux, D., & Boyce, J. M. (2006). Martian perched craters and large ejecta volume: Evidence for episodes of deflation in the northern lowlands. Meteoritics & Planetary Science, 41(10), 1647-1658.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2006.tb00441.x
dc.identifier.urihttp://hdl.handle.net/10150/656204
dc.descriptionFrom the proceedings of the Workshop on the Role of Volatiles and Atmospheres on Martian Impact Craters held on July 11-14, 2005, at the Johns Hopkins University Applied Physics Laboratory.
dc.description.abstractWe measured the depth, wall steepness, and ejecta roughness and surveyed the wall and floor morphology of all craters 10-25 km in diameter within the typical Vastitas Borealis Formation in the northern lowlands of Mars north of 52 degrees N. Two of the 130 craters have unusually rough ejecta; they are deep, have steep walls, and are apparently the youngest in the population. Icy mantles filling the local subkilometer-scale topographic lows is the main contribution to ejecta smoothing, which occurs at a time scale on the order of tens of Myr. Wall degradation and crater shallowing generally occur at longer time scales, comparable to the duration of the Amazonian period. Many craters are shallow due to filling of the crater with specific ice-rich material of uncertain origin. We use our collected data to infer the nature of the past climate back through the Amazonian, a period prior to ~10-20 Myr ago, when orbital parameter solutions are chaotic and one must rely on geological data to infer climate conditions. We conclude that moderately high obliquity and wide obliquity variations were probable during the last 40-160 Myr. We tentatively conclude that high obliquity peaks (>40-45 degrees) may have occurred episodically through the last 210-430 Myr. A sharp step in the frequency distribution of wall steepness at 20 degrees may indicate a geologically long period prior to that time where obliquity never exceeded 40-45 degrees.
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.subjectPlanet Mars
dc.subjectGeomorphology
dc.subjectcraters
dc.subjectremote sensing
dc.titleModification of impact craters in the northern plains of Mars: Implications for Amazonian climate history
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.volume41
dc.source.issue10
dc.source.beginpage1633
dc.source.endpage1646
refterms.dateFOA2021-02-12T21:41:02Z


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