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dc.contributor.authorKing, A
dc.contributor.authorBates, HC
dc.contributor.authorKrietsch, D
dc.contributor.authorBusemann, H
dc.contributor.authorClay, PL
dc.contributor.authorSchofield, PF
dc.contributor.authorRussell, Sara
dc.date.accessioned2019-12-19T11:12:32Z
dc.date.available2019-12-19T11:12:32Z
dc.date.issued2019-08-20
dc.date.submitted2019-11-20
dc.identifier.citationA.J. King, H.C. Bates, D. Krietsch, H. Busemann, P.L. Clay, P.F. Schofield, S.S. Russell, The Yamato-type (CY) carbonaceous chondrite group: Analogues for the surface of asteroid Ryugu?, Geochemistry, Volume 79, Issue 4, 2019, 125531, ISSN 0009-2819, https://doi.org/10.1016/j.chemer.2019.08.003.en_US
dc.identifier.issn0009-2819
dc.identifier.doi10.1016/j.chemer.2019.08.003
dc.identifier.urihttp://hdl.handle.net/10141/622598
dc.description.abstractWe report new mineralogical, petrographic and noble gas analyses of the carbonaceous chondrite meteorites Y-82162 (C1/2ung), Y-980115 (CI1), Y-86029 (CI1), Y-86720 (C2ung), Y-86789 (C2ung), and B-7904 (C2ung). Combining our results with literature data we show that these meteorites experienced varying degrees of aqueous alteration followed by short-lived thermal metamorphism at temperatures of >500 °C. These meteorites have similar mineralogy, textures and chemical characteristics suggesting that they are genetically related, and we strongly support the conclusion of Ikeda (1992) that they form a distinct group, the CYs (“Yamato-type”). The CY chondrites have the heaviest oxygen isotopic compositions (δ17O ˜12‰, δ18O ˜22‰) of any meteorite group, high abundances of Fe-sulphides (˜10 ‒ 30 vol%) and phosphates, and contain large grains of periclase and unusual objects of secondary minerals not reported in other carbonaceous chondrites. These features cannot be attributed to parent body processes alone, and indicate that the CYs had a different starting mineralogy and/or alteration history to other chondrite groups, perhaps because they formed in a different region of the protoplanetary disk. The short cosmic-ray exposure ages (≤1.3 Ma) of the CY chondrites suggest that they are derived from a near-Earth source, with recent observations by the Hayabusa2 spacecraft highlighting a possible link to the rubble-pile asteroid Ryugu.en_US
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0009281919300236en_US
dc.rightsopenAccessen_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleThe Yamato-type (CY) carbonaceous chondrite group: Analogues for the surface of asteroid Ryugu?en_US
dc.typeJournal Articleen_US
dc.identifier.journalGeochemistryen_US
dc.identifier.startpage125531 - 125531en_US
pubs.organisational-group/Natural History Museum
pubs.organisational-group/Natural History Museum/Science Group
pubs.organisational-group/Natural History Museum/Science Group/Earth Sciences
pubs.organisational-group/Natural History Museum/Science Group/Earth Sciences/Mineral and Planetary Sciences
pubs.organisational-group/Natural History Museum/Science Group/Functional groups
pubs.organisational-group/Natural History Museum/Science Group/Functional groups/PhD Students
dc.embargoNot knownen_US
elements.import.authorKing, AJen_US
elements.import.authorBates, HCen_US
elements.import.authorKrietsch, Den_US
elements.import.authorBusemann, Hen_US
elements.import.authorClay, PLen_US
elements.import.authorSchofield, PFen_US
elements.import.authorRussell, SSen_US
dc.description.nhm2019 The Authors. Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). The attached file is the published pdf.en_US
dc.subject.nhmCarbonaceous chondriteen_US
dc.subject.nhmAqueous alterationen_US
dc.subject.nhmThermal metamorphismen_US
dc.subject.nhmAsteroidsen_US
dc.subject.nhmMeteoritesen_US
dc.subject.nhmRyuguen_US
dc.subject.nhmHayabusa-2en_US
refterms.dateFOA2019-12-19T11:12:32Z


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