Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/27007
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dc.contributor.authorMichikami, Tatsuhiroen_UK
dc.contributor.authorKadokawa, Tokiyukien_UK
dc.contributor.authorTsuchiyama, Akiraen_UK
dc.contributor.authorHagermann, Axelen_UK
dc.contributor.authorNakano, Tsukasaen_UK
dc.contributor.authorUesugi, Kentaroen_UK
dc.contributor.authorHasegawa, Sunaoen_UK
dc.date.accessioned2018-04-15T00:11:24Z-
dc.date.available2018-04-15T00:11:24Z-
dc.date.issued2018-03-01en_UK
dc.identifier.urihttp://hdl.handle.net/1893/27007-
dc.description.abstractIn 2010, fine regolith particles on asteroid Itokawa were recovered by the Hayabusa mission. The three-dimensional microstructure of 48 Itokawa particles smaller than 120 µm was examined in previous studies. The shape distribution of Itokawa particles is distributed around the mean values of the axial ratio 2:√2:1, which is similar to laboratory impact fragments larger than several mm created in catastrophic disruptions. Thus, the Itokawa particles are considered to be impact fragments on the asteroid's surface. However, there have never been any laboratory impact experiments investigating the shapes of fine fragments smaller than 120 µm, and little is known about the relation between the shapes of fine fragments and the petrographic textures within those fragments. In this study, in order to investigate the relation between the petrographic textures and the shapes of fine fragments by impacts, the shapes of 2163 fine fragments smaller than 120 µm are examined by synchrotron radiation-based microtomography at SPring-8. Most samples are fine fragments from basalt targets, obtained in previous laboratory impact experiments by Michikami et al. (2016). Moreover, two impacts into L5 chondrite targets were carried out and the shapes of their fine fragments are examined for comparison. The results show that the shape distributions of fine fragments in basalt targets are similar regardless of impact energy per target mass (in contract to the shape distribution of relatively large fragments, which are affected by impact energy), and are similar to those in L5 chondrite targets and Itokawa regolith particles. The physical process producing these fine fragments would be due to multiple rarefaction waves in the target. Besides, the petrographic textures do not significantly affect the shapes of fine fragments in our experiments. On the other hand, according to Molaro et al. (2015), the shapes of the fragments produced by thermal fatigue by the day-night temperature cycles on the asteroid surface are influenced by the petrographic textures. Therefore, we conclude that the Itokawa particles are not the products of thermal fatigue but impact fragments on the asteroid surface. © 2017 The Authorsen_UK
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.relationMichikami T, Kadokawa T, Tsuchiyama A, Hagermann A, Nakano T, Uesugi K & Hasegawa S (2018) Influence of petrographic textures on the shapes of impact experiment fine fragments measuring several tens of microns: Comparison with Itokawa regolith particles. Icarus, 302, pp. 109-125. https://doi.org/10.1016/j.icarus.2017.10.040en_UK
dc.rights© 2017 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)en_UK
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_UK
dc.subjectImpact processesen_UK
dc.subjectCollisional physicsen_UK
dc.subjectAsteroid Itokawaen_UK
dc.subjectRegolithsen_UK
dc.titleInfluence of petrographic textures on the shapes of impact experiment fine fragments measuring several tens of microns: Comparison with Itokawa regolith particlesen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1016/j.icarus.2017.10.040en_UK
dc.citation.jtitleIcarusen_UK
dc.citation.issn0019-1035en_UK
dc.citation.volume302en_UK
dc.citation.spage109en_UK
dc.citation.epage125en_UK
dc.citation.publicationstatusPublisheden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.citation.date10/11/2017en_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationGeological Survey of Japanen_UK
dc.contributor.affiliationJapan Synchrotron Radiation Research Instituteen_UK
dc.contributor.affiliationJapan Aerospace Exploration Agencyen_UK
dc.identifier.isiWOS:000423779600009en_UK
dc.identifier.scopusid2-s2.0-85034050328en_UK
dc.identifier.wtid878424en_UK
dc.contributor.orcid0000-0002-1818-9396en_UK
dc.date.accepted2017-10-30en_UK
dcterms.dateAccepted2017-10-30en_UK
dc.date.filedepositdate2018-04-12en_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorMichikami, Tatsuhiro|en_UK
local.rioxx.authorKadokawa, Tokiyuki|en_UK
local.rioxx.authorTsuchiyama, Akira|en_UK
local.rioxx.authorHagermann, Axel|0000-0002-1818-9396en_UK
local.rioxx.authorNakano, Tsukasa|en_UK
local.rioxx.authorUesugi, Kentaro|en_UK
local.rioxx.authorHasegawa, Sunao|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2018-04-12en_UK
local.rioxx.licencehttp://creativecommons.org/licenses/by/4.0/|2018-04-12|en_UK
local.rioxx.filename1-s2.0-S0019103517306929-main.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source0019-1035en_UK
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