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Meteorite evidence for partial differentiation and protracted accretion of planetesimals
Name
sciadv.aba1303.pdf
Description
Published version
Size
1.17 MB
Format
Adobe PDF
Checksum (MD5)
738e431656e06478766a97fb3f5bcdcf
Author(s)
Maurel, Clara
Bryson, James FJ
Lyons, Richard J
Ball, Matthew R
Chopdekar, Rajesh V
Scholl, Andreas
Ciesla, Fred J
Bottke, William F
Weiss, Benjamin P
Date Issued
2020
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Version
Final published version
Abstract
© 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). Modern meteorite classification schemes assume that no single planetary body could be source of both unmelted (chondritic) and melted (achondritic) meteorites. This dichotomy is a natural outcome of formation models assuming that planetesimal accretion occurred nearly instantaneously. However, it has recently been proposed that the accretion of many planetesimals lasted over ≳1 million years (Ma). This could have resulted in partially differentiated internal structures, with individual bodies containing iron cores, achondritic silicate mantles, and chondritic crusts. This proposal can be tested by searching for a meteorite group containing evidence for these three layers. We combine synchrotron paleomagnetic analyses with thermal, impact, and collisional evolution models to show that the parent body of the enigmatic IIE iron meteorites was such a partially differentiated planetesimal. This implies that some chondrites and achondrites simultaneously coexisted on the same planetesimal, indicating that accretion was protracted and that apparently undifferentiated asteroids may contain melted interiors.
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
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DOI of Published Version
10.1126/SCIADV.ABA1303
