Abstract
Calcium-aluminum-rich inclusions (CAIs) and chondrules are among the most predominant chondritic components contained within primitive meteorites. As CAIs are the first solids to form in the solar nebula, they contain a record of its earliest chemical and physical processes. Here we combine electron backscatter diffraction (EBSD) and 26Al-26Mg chronology techniques to determine the crystallographic properties and ages of CAI components that provide temporal as well as spatial constraints on their origins and subsequent processing in the solar protoplanetary disk. We find evidence of shock deformation within a CAI, suggesting that it was deformed as a free-floating object soon after the CAI formation at the beginning of the Solar System. Our results suggest that even though CAIs and chondrules formed in distinct environments and on different timescales, they were likely affected by similar shock processes that operated over large temporal (0 to ∼4 Ma) and spatial (0.2 to at least 2 to 3 au) extents. Our results imply that nebular shock events were active on a wider scale in the solar protoplanetary disk than previously recognized.
| Original language | English |
|---|---|
| Pages (from-to) | 369-388 |
| Number of pages | 20 |
| Journal | Geochimica et Cosmochimica Acta |
| Volume | 332 |
| DOIs | |
| State | Published - Sep 1 2022 |
| Externally published | Yes |
Funding
This research was supported by the NASA Earth and Space Science Fellowship (NNX13AP41H) to P. Mane, NASA Cosmochemistry (NNX11AK75G PI M. Wadhwa) and NASA Emerging Worlds Programs (NNX15AH41G PI Wadhwa), (NNX15AJ22G and 80NSSC19K0509 PI Zega). We gratefully acknowledge NASA (NNX12AL47G and NNX15AJ22G) and NSF (DMR-1531243) for funding of the instrumentation in the Kuiper Materials Imaging and Characterization Facility at the University of Arizona and NSF facility grant (EAR-1352996) to the SIMS facility at Arizona State University. We would like to thank Center for Meteorite Studies (CMS) at Arizona State University for loaning the NWA 5028 meteorite section. We thank Ken Domanik his help with the EPMA analysis. We thank Alan Boss, Mark Cintala, Harold Connolly, Steve Desch, Emilie Dunham, Timmons Erickson, Scott Messenger, Andrew Needham, Ann Nguyen, Sara Russell, and Stu Weidenschilling for their feedback and helpful discussions about this work. The authors would like to thank the associate editor Hope Ishii and reviewers Andrew Davis, Alex Ruzicka, and Luke Daly for their constructive comments in the review process. This research was supported by the NASA Earth and Space Science Fellowship (NNX13AP41H) to P. Mane, NASA Cosmochemistry (NNX11AK75G PI M. Wadhwa) and NASA Emerging Worlds Programs (NNX15AH41G PI Wadhwa), (NNX15AJ22G and 80NSSC19K0509 PI Zega). We gratefully acknowledge NASA (NNX12AL47G and NNX15AJ22G) and NSF (DMR-1531243) for funding of the instrumentation in the Kuiper Materials Imaging and Characterization Facility at the University of Arizona and NSF facility grant (EAR-1352996) to the SIMS facility at Arizona State University. We would like to thank Center for Meteorite Studies (CMS) at Arizona State University for loaning the NWA 5028 meteorite section. We thank Ken Domanik his help with the EPMA analysis. We thank Alan Boss, Mark Cintala, Harold Connolly, Steve Desch, Emilie Dunham, Timmons Erickson, Scott Messenger, Andrew Needham, Ann Nguyen, Sara Russell, and Stu Weidenschilling for their feedback and helpful discussions about this work. The authors would like to thank the associate editor Hope Ishii and reviewers Andrew Davis, Alex Ruzicka, and Luke Daly for their constructive comments in the review process.
Keywords
- Al-Mg chronology
- Calcium-aluminum rich inclusions
- Early solar system
- Electron backscatter diffraction
- Nebular shocks