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Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies

Kurokawa, H. and Shibuya, T. and Sekine, Y. and Ehlmann, B. L. and Usui, F. and Kikuchi, S. and Yoda, M. (2022) Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies. AGU Advances, 3 (1). Art. No. e2021AV000568. ISSN 2576-604X. doi:10.1029/2021AV000568. https://resolver.caltech.edu/CaltechAUTHORS:20221212-201620299

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Abstract

Volatile compositions of asteroids provide information on the Solar System history and the origins of Earth's volatiles. Visible to near-infrared observations at wavelengths of <2.5 µm have suggested a genetic link between outer main belt asteroids located at 2.5–4 au and carbonaceous chondrite meteorites (CCs) that show isotopic similarities to volatile elements on Earth. However, recent longer wavelength data for large outer main belt asteroids show 3.1 μm absorption features of ammoniated phyllosilicates that are absent in CCs and cannot easily form from materials stable at those present distances. Here, by combining data collected by the AKARI space telescope and hydrological, geochemical, and spectral models of water-rock reactions, we show that the surface materials of asteroids having 3.1 μm absorption features and CCs can originate from different regions of a single, water-rock-differentiated parent body. Ammoniated phyllosilicates form within the water-rich mantles of the differentiated bodies containing NH3 and CO2 under high water-rock ratios (>4) and low temperatures (<70°C). CCs can originate from the rock-dominated cores, that are likely to be preferentially sampled as meteorites by disruption and transport processes. Our results suggest that multiple large main belt asteroids formed beyond the NH3 and CO2 snow lines (currently >10 au) and could be transported to their current locations. Earth's high hydrogen to carbon ratio may be explained by accretion of these water-rich progenitors.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2021AV000568DOIArticle
ORCID:
AuthorORCID
Kurokawa, H.0000-0003-1965-1586
Sekine, Y.0000-0002-3544-3632
Ehlmann, B. L.0000-0002-2745-3240
Yoda, M.0000-0001-8568-8710
Additional Information:The authors thank the editor Francis Nimmo, Lucy F. Lim, and three anonymous reviewers for their careful review and constructive comments, which highly improved our manuscript. The authors thank Andrew Rivkin, Driss Takir, Valerie Fox, and Hannah Kaplan for sharing reflectance data, Takehiro Hiroi and Moe Matsuoka for discussion about infrared reflectance spectra of meteorites, Mikhail Zolotov for sharing the modified version of the FREZCHEM code, and Keisuke Fukushi for providing thermodynamic parameters for smectites. This study was supported by JSPS KAKENHI Grant number 15K05277, 17H01175, 17H06454, 17H06455, 17H06456, 17H06457, 17H06458, 17H06459, 17K05636, 18K13602, 19H00725, 19H01960, 19H05072, 20KK0080, 21H04514, 21K13976, and JSPS Core-to-Core Program “International Network of Planetary Sciences.” Part of the data utilized in this publication were obtained and made available by the MITHNEOS MIT-Hawaii Near-Earth Object Spectroscopic Survey. The IRTF is operated by the University of Hawaii under Cooperative Agreement no. NCC 5-538 with the National Aeronautics and Space Administration, Office of Space Science, Planetary Astronomy Program. The MIT component of this work is supported by NASA grant 09-NEOO009-0001, and by the National Science Foundation under Grants Nos. 0506716 and 0907766.
Group:Division of Geological and Planetary Sciences
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)15K05277
Japan Society for the Promotion of Science (JSPS)17H01175
Japan Society for the Promotion of Science (JSPS)17H06454
Japan Society for the Promotion of Science (JSPS)17H06455
Japan Society for the Promotion of Science (JSPS)17H06456
Japan Society for the Promotion of Science (JSPS)17H06457
Japan Society for the Promotion of Science (JSPS)17H06458
Japan Society for the Promotion of Science (JSPS)17H06459
Japan Society for the Promotion of Science (JSPS)17K05636
Japan Society for the Promotion of Science (JSPS)18K13602
Japan Society for the Promotion of Science (JSPS)19H00725
Japan Society for the Promotion of Science (JSPS)19H01960
Japan Society for the Promotion of Science (JSPS)19H05072
Japan Society for the Promotion of Science (JSPS)20KK0080
Japan Society for the Promotion of Science (JSPS)21H04514
Japan Society for the Promotion of Science (JSPS)21K13976
NASANCC 5-538
NASA09-NEOO009-0001
NSFAST-0506716
NSFAST-0907766
Issue or Number:1
DOI:10.1029/2021AV000568
Record Number:CaltechAUTHORS:20221212-201620299
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20221212-201620299
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118290
Collection:CaltechAUTHORS
Deposited By: Research Services Depository
Deposited On:12 Dec 2022 21:04
Last Modified:12 Dec 2022 21:04

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