@article{183b63d35b7b4b0a929e1426ce323b2f,
title = "Prolonged early migration of dust from the inner Solar System to the comet-forming region",
abstract = "The most abundant group of meteorites currently falling to Earth, ordinary chondrites, originate from S-type (Si-rich) asteroids and are thought to have originated in the inner Solar System. These asteroids typically underwent only minor aqueous alteration but experienced varying degrees of thermal metamorphism that altered their primary compositions and textures. However, some rare members remain unaltered and retain the pristine compositions they obtained in the protoplanetary disk prior to accretion of their parent asteroids. In contrast, comets formed in the icy reaches of the outer Solar System. Here we report on silicate minerals in pristine ordinary chondrites that are compositionally distinct from those in all other known chondrites but show similarities to those found in comet samples returned from Comet Wild 2 by NASA's Stardust mission and those sourced from an unknown number of comets represented by interplanetary dusty particles. The identification of this material suggests that comets may have formed from diverse far-flung Solar System materials, including grains that migrated from the inner Solar System to the comet-forming region between ∼1 Myr and potentially ⪆3 Myr after the first Solar System solids formed. This finding suggests that migration from the inner to the outer Solar System lasted for millions of years and that comets are composed of residual materials from the entire early Solar System.",
keywords = "Jupiter gap, chondrite, chondrule, comet, migration, protoplanetary disk",
author = "Schrader, {Devin L.} and Jemma Davidson",
note = "Funding Information: For supplying the samples that were necessary for this work, the authors would like to thank the Smithsonian Institution, NASA/NSF, and the American Meteorite Laboratory (AML). US Antarctic meteorite samples are recovered by the Antarctic Search for Meteorites (ANSMET) program, which has been funded by NSF and NASA, and characterized and curated by the Department of Mineral Sciences of the Smithsonian Institution and Astromaterials Curation Office at NASA Johnson Space Center. We would like to thank Tim McCoy for helpful discussions during coerced geocaching expeditions, and are grateful to Axel Wittmann for assistance with the EPMA at ASU and Ken Domanik for assistance with the EPMA at UA. We are grateful to Thorsten Kleine, two anonymous reviewers, and Editor Fr{\'e}d{\'e}ric Moynier, whose constructive comments improved the quality of the manuscript. We dedicate this work to the memory of Mr. Cavill Chow, whose loyalty, humor, and ability to listen were unmatched and will always be remembered. We acknowledge the use of facilities within the Eyring Materials Center at Arizona State University supported in part by NNCI-ECCS-1542160. This work was funded in part by the Buseck Center for Meteorite Studies at Arizona State University. Funding Information: For supplying the samples that were necessary for this work, the authors would like to thank the Smithsonian Institution, NASA/NSF, and the American Meteorite Laboratory (AML). US Antarctic meteorite samples are recovered by the Antarctic Search for Meteorites (ANSMET) program, which has been funded by NSF and NASA , and characterized and curated by the Department of Mineral Sciences of the Smithsonian Institution and Astromaterials Curation Office at NASA Johnson Space Center. We would like to thank Tim McCoy for helpful discussions during coerced geocaching expeditions, and are grateful to Axel Wittmann for assistance with the EPMA at ASU and Ken Domanik for assistance with the EPMA at UA. We are grateful to Thorsten Kleine, two anonymous reviewers, and Editor Fr{\'e}d{\'e}ric Moynier, whose constructive comments improved the quality of the manuscript. We dedicate this work to the memory of Mr. Cavill Chow, whose loyalty, humor, and ability to listen were unmatched and will always be remembered. We acknowledge the use of facilities within the Eyring Materials Center at Arizona State University supported in part by NNCI-ECCS-1542160. This work was funded in part by the Buseck Center for Meteorite Studies at Arizona State University . Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",
year = "2022",
month = jul,
day = "1",
doi = "10.1016/j.epsl.2022.117552",
language = "English (US)",
volume = "589",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",
}