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dc.contributor.authorKing, A
dc.contributor.authorRussell, S
dc.contributor.authorSchofield, P
dc.contributor.authorHumphreys-Williams, E
dc.contributor.authorStrekopytov, S
dc.identifier.citationKing, A. J., Russell, S. S., Schofield, P. F., Humphreys‐Williams, E. R., Strekopytov, S. , Abernethy, F. A., Verchovsky, A. B. and Grady, M. M. (2019), The alteration history of the Jbilet Winselwan CM carbonaceous chondrite: An analog for C‐type asteroid sample return. Meteorit Planet Sci, 54: 521-543. doi:10.1111/maps.13224en_US
dc.description.abstractJbilet Winselwan is one of the largest CM carbonaceous chondrites available for study. Its light, major, and trace elemental compositions are within the range of other CM chondrites. Chondrules are surrounded by dusty rims and set within a matrix of phyllosilicates, oxides, and sulfides. Calcium‐ and aluminum‐rich inclusions (CAIs) are present at ≤1 vol% and at least one contains melilite. Jbilet Winselwan is a breccia containing diverse lithologies that experienced varying degrees of aqueous alteration. In most lithologies, the chondrules and CAIs are partially altered and the metal abundance is low (<1 vol%), consistent with petrologic subtypes 2.7–2.4 on the Rubin et al. (2007) scale. However, chondrules and CAIs in some lithologies are completely altered suggesting more extensive hydration to petrologic subtypes ≤2.3. Following hydration, some lithologies suffered thermal metamorphism at 400–500 °C. Bulk X‐ray diffraction shows that Jbilet Winselwan consists of a highly disordered and/or very fine‐grained phase (73 vol%), which we infer was originally phyllosilicates prior to dehydration during a thermal metamorphic event(s). Some aliquots of Jbilet Winselwan also show significant depletions in volatile elements such as He and Cd. The heating was probably short‐lived and caused by impacts. Jbilet Winselwan samples a mixture of hydrated and dehydrated materials from a primitive water‐rich asteroid. It may therefore be a good analog for the types of materials that will be encountered by the Hayabusa‐2 and OSIRIS‐REx asteroid sample‐return missions.en_US
dc.titleThe alteration history of the Jbilet Winselwan CM carbonaceous chondrite: An analog for C-type asteroid sample returnen_US
dc.typeJournal Articleen_US
dc.identifier.journalMeteoritics and Planetary Scienceen_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/Research
dc.embargoNot knownen_US
elements.import.authorKing, Aen_US
elements.import.authorRussell, Sen_US
elements.import.authorSchofield, Pen_US
elements.import.authorHumphreys-Williams, Een_US
elements.import.authorStrekopytov, Sen_US
dc.description.nhm© 2018 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals, Inc. on behalf of The Meteoritical Society (MET). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The attached file is the published version of this article.en_US

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