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dc.contributor.authorSuttle, Martin
dc.contributor.authorGenge, MJ
dc.contributor.authorFolco, L
dc.contributor.authorVan Ginneken, M
dc.contributor.authorLin, Q
dc.contributor.authorRussell, SS
dc.contributor.authorNajorka, J
dc.date.accessioned2021-07-08T13:34:03Z
dc.date.available2021-07-08T13:34:03Z
dc.date.issued2019-03
dc.identifier.citationSuttle, M.D., Genge, M.J., Folco, L., Van Ginneken, M., Lin, Q., Russell, S.S. and Najorka, J. (2019), The atmospheric entry of fine-grained micrometeorites: The role of volatile gases in heating and fragmentation. Meteorit Planet Sci, 54: 503-520. https://doi.org/10.1111/maps.13220en_US
dc.identifier.issn1086-9379
dc.identifier.doi10.1111/maps.13220
dc.identifier.urihttp://hdl.handle.net/10141/622916
dc.description.abstractThe early stages of atmospheric entry are investigated in four large (250–950 lm) unmelted micrometeorites (three fine-grained and one composite), derived from the Transantarctic Mountain micrometeorite collection. These particles have abundant, interconnected, secondary pore spaces which form branching channels and show evidence of enhanced heating along their channel walls. Additionally, a micrometeorite with a doublewalled igneous rim is described, suggesting that some particles undergo volume expansion during entry. This study provides new textural data which links together entry heating processes known to operate inside micrometeoroids, thereby generating a more comprehensive model of their petrographic evolution. Initially, flash heated micrometeorites develop a melt layer on their exterior; this igneous rim migrates inwards. Meanwhile, the particle core is heated by the decomposition of low-temperature phases and by volatile gas release. Where the igneous rim acts as a seal, gas pressures rise, resulting in the formation of interconnected voids and higher particle porosities. Eventually, the igneous rim is breached and gas exchange with the atmosphere occurs. This mechanism replaces inefficient conductive rim-to-core thermal gradients with more efficient particle-wide heating, driven by convective gas flow. Interconnected voids also increase the likelihood of particle fragmentation during entry and, may therefore explain the rarity of large fine-grained micrometeorites among collections.en_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rightsopenAccessen_US
dc.titleThe atmospheric entry of fine-grained micrometeorites: The role of volatile gases in heating and fragmentationen_US
dc.typeJournal Articleen_US
dc.identifier.eissn1945-5100
dc.identifier.journalMeteoritics & Planetary Scienceen_US
dc.date.updated2021-04-21T13:13:08Z
dc.identifier.volume54en_US
dc.identifier.issue3en_US
dc.identifier.startpage503en_US
dc.description.nhmCopyright © 2018, Suttle, M.D. et al. This document is the author’s final accepted version of the journal article. You are advised to consult the published version if you wish to cite from it.en_US
refterms.dateFOA2021-07-08T13:34:04Z


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