Isotopically Heavy Micrometeorites—Fragments of CY Chondrite or a New Hydrous Parent Body?
نویسندگان
چکیده
Cosmic dust grains sample a diverse range of solar system small bodies. This includes asteroids that are not otherwise represented in our meteorite collections. In this work we obtained 3D images micrometeorite interiors using tomography before collecting destructive high-precision oxygen isotope measurements. These data allow us to link textures unmelted micrometeorites known chondrite groups. addition identifying particles from ordinary chondrites, CR and CM chondrites report two derived an anomalous 16O-poor source (?17O: +16.4‰, ?18O: +28.4‰, ?17O: +1.4‰). Their compositions overlap with previously reported (TAM50-25) Suttle et al. (2020), https://doi.org/10.1016/j.epsl.2020.116444 (EPSL: 546:116444). represent hydrated carbonaceous material either new group or the CY (thereby extending isotopic group). scenario they demonstrate close petrographic connections CO-CM clan. Furthermore, their position O-isotope space makes them most likely candidate for parent body “group 4” cosmic spherules by Suavet (2010), https://doi.org/10.1016/j.epsl.2010.02.046 293:313-320) several subsequent studies. We conclude originate C-type asteroid parents.
منابع مشابه
Magnetic evidence for a partially differentiated carbonaceous chondrite parent body
Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139; Berkeley Geochronology Center, Berkeley, CA 94709; Department of Earth and Planetary Science, University of California, Berkeley, CA 94720; Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024; and Centre Européen de Recherche et d’E...
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Planets
سال: 2022
ISSN: ['2169-9100', '2169-9097']
DOI: https://doi.org/10.1029/2021je007154