The fusion crust of the Winchcombe meteorite: a preserved record of atmospheric entry processes

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dc.contributor.authorGenge, Matthew J.
dc.contributor.authorAlesbrook, Luke
dc.contributor.authorAlmeida, Natasha V.
dc.contributor.authorBates, Helena C.
dc.contributor.authorBland, Phil A.
dc.contributor.authorBoyd, Mark R.
dc.contributor.authorBurchell, Mark J.
dc.contributor.authorCollins, Gareth S.
dc.contributor.authorCornwell, Luke T.
dc.contributor.authorDaly, Luke
dc.contributor.authorDevillepoix, Hadrien A. R.
dc.contributor.authorvan Ginneken, Matthias
dc.contributor.authorGreshake, Ansgar
dc.contributor.authorHallatt, Daniel
dc.contributor.authorHamann, Christopher
dc.contributor.authorHecht, Lutz
dc.contributor.authorJenkins, Laura E.
dc.contributor.authorJohnson, Diane
dc.contributor.authorJones, Rosie
dc.contributor.authorKing, Ashley J.
dc.contributor.authorMansour, Haithem
dc.contributor.authorMcMullan, Sarah
dc.contributor.authorMitchell, Jennifer T.
dc.contributor.authorRollinson, Gavyn
dc.contributor.authorRussell, Sara S.
dc.contributor.authorSchröder, Christian
dc.contributor.authorStephen, Natasha R.
dc.contributor.authorSuttle, Martin D.
dc.contributor.authorTandy, Jon D.
dc.contributor.authorTrimby, Patrick
dc.contributor.authorSansom, Eleanor K.
dc.contributor.authorSpathis, Vassilia
dc.contributor.authorWillcocks, Francesca M.
dc.contributor.authorWozniakiewicz, Penelope J.
dc.date.accessioned2023-01-18T10:37:47Z
dc.date.available2023-01-18T10:37:47Z
dc.date.issued2023-01-02
dc.descriptionSpecial Issue: The science of the Winchcombe meteorite
dc.description.abstractFusion crusts form during the atmospheric entry heating of meteorites and preserve a record of the conditions that occurred during deceleration in the atmosphere. The fusion crust of the Winchcombe meteorite closely resembles that of other stony meteorites, and in particular CM2 chondrites, since it is dominated by olivine phenocrysts set in a glassy mesostasis with magnetite, and is highly vesicular. Dehydration cracks are unusually abundant in Winchcombe. Failure of this weak layer is an additional ablation mechanism to produce large numbers of particles during deceleration, consistent with the observation of pulses of plasma in videos of the Winchcombe fireball. Calving events might provide an observable phenomenon related to meteorites that are particularly susceptible to dehydration. Oscillatory zoning is observed within olivine phenocrysts in the fusion crust, in contrast to other meteorites, perhaps owing to temperature fluctuations resulting from calving events. Magnetite monolayers are found in the crust, and have also not been previously reported, and form discontinuous strata. These features grade into magnetite rims formed on the external surface of the crust and suggest the trapping of surface magnetite by collapse of melt. Magnetite monolayers may be a feature of meteorites that undergo significant degassing. Silicate warts with dendritic textures were observed and are suggested to be droplets ablated from another stone in the shower. They, therefore, represent the first evidence for intershower transfer of ablation materials and are consistent with the other evidence in the Winchcombe meteorite for unusually intense gas loss and ablation, despite its low entry velocity.en_UK
dc.description.sponsorshipScience and Technology Facilities Council (STFC): ST/V000799/1en_UK
dc.identifier.citationGenge MJ, Alesbrook L, Almeida NV, et al., (2023) The fusion crust of the Winchcombe meteorite: a preserved record of atmospheric entry processes, Meteoritics and Planetary Science, Volume 59, Issue 5, May 2024, pp. 948-972en_UK
dc.identifier.eissn1945-5100
dc.identifier.issn1086-9379
dc.identifier.urihttps://doi.org/10.1111/maps.13937
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18973
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleThe fusion crust of the Winchcombe meteorite: a preserved record of atmospheric entry processesen_UK
dc.typeArticleen_UK

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