Chromium Isotopic Evidence for Mixing of NC and CC Reservoirs in Polymict Ureilites: Implications for Dynamical Models of the Early Solar System
Abstract
Nucleosynthetic isotope anomalies show that the first few million years of solar system history were characterized by two distinct cosmochemical reservoirs, CC (carbonaceous chondrites and related differentiated meteorites) and NC (the terrestrial planets and all other groups of chondrites and differentiated meteorites), widely interpreted to correspond to the outer and inner solar system, respectively. At some point, however, bulk CC and NC materials became mixed, and several dynamical models offer explanations for how and when this occurred. We use xenoliths of CC materials in polymict ureilite (NC) breccias to test the applicability of such models. Polymict ureilites represent regolith on ureilitic asteroids but contain carbonaceous chondrite-like xenoliths. We present the first 54Cr isotope data for such clasts, which, combined with oxygen and hydrogen isotopes, show that they are unique CC materials that became mixed with NC materials in these breccias. It has been suggested that such xenoliths were implanted into ureilites by outer solar system bodies migrating into the inner solar system during the gaseous disk phase ~3–5 Myr after CAI, as in the "Grand Tack" model. However, combined textural, petrologic, and spectroscopic observations suggest that they were added to ureilitic regolith at ~50–60 Myr after CAI, along with ordinary,more »
- Authors:
-
[1];
[2];
[2];
[6];
[3];
- Universities Space Research Association, Houston, TX (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Johns Hopkins Univ., Baltimore, MD (United States)
- Southwest Research Institute, Boulder, CO (United States)
- NASA Johnson Space Center, Houston, TX (United States)
- Search for extraterrestrial intelligence (SETI Institute), Mountain View, CA (United States)
- University of Khartoum (Sudan)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1774457
- Report Number(s):
- LA-UR-20-27459
Journal ID: ISSN 2632-3338; TRN: US2209225
- Grant/Contract Number:
- 89233218CNA000001; NNX17AH09GS03; 80NSSC19K0507; NNX16AD34G
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Planetary Science Journal
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 1; Journal ID: ISSN 2632-3338
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Planetary sciences; Dynamical evolution; Meteorites; Achondrites; Impact phenomena; Isotopic abundances
Citation Formats
Goodrich, Cyrena A., Sanborn, Matthew E., Yin, Qing-Zhu, Kohl, Issaku, Frank, David, Daly, R. Terik, Walsh, Kevin J., Zolensky, Michael E., Young, Edward R. D., Jenniskens, Peter, and Shaddad, Muawia H. Chromium Isotopic Evidence for Mixing of NC and CC Reservoirs in Polymict Ureilites: Implications for Dynamical Models of the Early Solar System. United States: N. p., 2021.
Web. doi:10.3847/psj/abd258.
Goodrich, Cyrena A., Sanborn, Matthew E., Yin, Qing-Zhu, Kohl, Issaku, Frank, David, Daly, R. Terik, Walsh, Kevin J., Zolensky, Michael E., Young, Edward R. D., Jenniskens, Peter, & Shaddad, Muawia H. Chromium Isotopic Evidence for Mixing of NC and CC Reservoirs in Polymict Ureilites: Implications for Dynamical Models of the Early Solar System. United States. https://doi.org/10.3847/psj/abd258
Goodrich, Cyrena A., Sanborn, Matthew E., Yin, Qing-Zhu, Kohl, Issaku, Frank, David, Daly, R. Terik, Walsh, Kevin J., Zolensky, Michael E., Young, Edward R. D., Jenniskens, Peter, and Shaddad, Muawia H. Thu .
"Chromium Isotopic Evidence for Mixing of NC and CC Reservoirs in Polymict Ureilites: Implications for Dynamical Models of the Early Solar System". United States. https://doi.org/10.3847/psj/abd258. https://www.osti.gov/servlets/purl/1774457.
@article{osti_1774457,
title = {Chromium Isotopic Evidence for Mixing of NC and CC Reservoirs in Polymict Ureilites: Implications for Dynamical Models of the Early Solar System},
author = {Goodrich, Cyrena A. and Sanborn, Matthew E. and Yin, Qing-Zhu and Kohl, Issaku and Frank, David and Daly, R. Terik and Walsh, Kevin J. and Zolensky, Michael E. and Young, Edward R. D. and Jenniskens, Peter and Shaddad, Muawia H.},
abstractNote = {Nucleosynthetic isotope anomalies show that the first few million years of solar system history were characterized by two distinct cosmochemical reservoirs, CC (carbonaceous chondrites and related differentiated meteorites) and NC (the terrestrial planets and all other groups of chondrites and differentiated meteorites), widely interpreted to correspond to the outer and inner solar system, respectively. At some point, however, bulk CC and NC materials became mixed, and several dynamical models offer explanations for how and when this occurred. We use xenoliths of CC materials in polymict ureilite (NC) breccias to test the applicability of such models. Polymict ureilites represent regolith on ureilitic asteroids but contain carbonaceous chondrite-like xenoliths. We present the first 54Cr isotope data for such clasts, which, combined with oxygen and hydrogen isotopes, show that they are unique CC materials that became mixed with NC materials in these breccias. It has been suggested that such xenoliths were implanted into ureilites by outer solar system bodies migrating into the inner solar system during the gaseous disk phase ~3–5 Myr after CAI, as in the "Grand Tack" model. However, combined textural, petrologic, and spectroscopic observations suggest that they were added to ureilitic regolith at ~50–60 Myr after CAI, along with ordinary, enstatite, and Rumuruti-type chondrites, as a result of the breakup of multiple parent bodies in the asteroid belt at this time. This is consistent with models for an early instability of the giant planets. The C-type asteroids from which the xenoliths were derived were already present in inner solar system orbits.},
doi = {10.3847/psj/abd258},
journal = {The Planetary Science Journal},
number = 1,
volume = 2,
place = {United States},
year = {Thu Jan 28 00:00:00 EST 2021},
month = {Thu Jan 28 00:00:00 EST 2021}
}
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