The Winchcombe meteorite: a regolith breccia from a rubble pile CM chondrite asteroid

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dc.contributor.authorSuttle, Martin D.
dc.contributor.authorDaly, Luke
dc.contributor.authorJones, Rhian H.
dc.contributor.authorJenkins, L.
dc.contributor.authorvan Ginneken, Matthias
dc.contributor.authorMitchell, Jennifer T.
dc.contributor.authorBridges, J. C.
dc.contributor.authorHicks, L. J.
dc.contributor.authorJohnson, Diane
dc.date.accessioned2023-01-26T11:15:08Z
dc.date.available2023-01-26T11:15:08Z
dc.date.issued2022-12-21
dc.descriptionSpecial Issue: The science of the Winchcombe meteorite
dc.description.abstractThe Winchcombe meteorite is a CM chondrite breccia composed of eight distinct lithological units plus a cataclastic matrix. The degree of aqueous alteration varies between intensely altered CM2.0 and moderately altered CM2.6. Although no lithology dominates, three heavily altered rock types (CM2.1–2.3) represent >70 area%. Tochilinite–cronstedtite intergrowths (TCIs) are common in several lithologies. Their compositions can vary significantly, even within a single lithology, which can prevent a clear assessment of alteration extent if only TCI composition is considered. We suggest that this is due to early alteration under localized geochemical microenvironments creating a diversity of compositions and because later reprocessing was incomplete, leaving a record of the parent body's fluid history. In Winchcombe, the fragments of primary accretionary rock are held within a cataclastic matrix (~15 area%). This material is impact-derived fallback debris. Its grain size and texture suggest that the disruption of the original parent asteroid responded by intergranular fracture at grain sizes <100 μm, while larger phases, such as whole chondrules, splintered apart. Re-accretion formed a poorly lithified body. During atmospheric entry, the Winchcombe meteoroid broke apart with new fractures preferentially cutting through the weaker cataclastic matrix and separating the breccia into its component clasts. The strength of the cataclastic matrix imparts a control on the survival of CM chondrite meteoroids. Winchcombe's unweathered state and diversity of lithologies make it an ideal sample for exploring the geological history of the CM chondrite group.en_UK
dc.identifier.citationSuttle MD, Daly L, Jones RH, et al., (2024) The Winchcombe meteorite: a regolith breccia from a rubble pile CM chondrite asteroid. Meteoritics and Planetary Science, Volume 59, Issue 5, May 2024, pp. 1043-1067en_UK
dc.identifier.issn1086-9379
dc.identifier.urihttps://doi.org/10.1111/maps.13938
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19019
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleThe Winchcombe meteorite: a regolith breccia from a rubble pile CM chondrite asteroiden_UK
dc.typeArticleen_UK

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