Titanium and chromium isotopic compositions of calcium-aluminum-rich inclusions: Implications for the sources of isotopic anomalies and the formation of distinct isotopic reservoirs in the early Solar System

Torrano, Zachary A.; Brennecka, Gregory A.; Mercer, Cameron M.; Romaniello, Stephen J.; Rai, Vinai K.; Hines, Rebekah R.; Wadhwa, Meenakshi

doi:10.1016/j.gca.2023.03.018

Title: Titanium and chromium isotopic compositions of calcium-aluminum-rich inclusions: Implications for the sources of isotopic anomalies and the formation of distinct isotopic reservoirs in the early Solar System

Journal Article · Tue Mar 21 00:00:00 EDT 2023 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2023.03.018· OSTI ID:1971296

^[1];

^[2]; Mercer, Cameron M. ^[1];

^[1]; Rai, Vinai K. ^[1];

^[1]; Wadhwa, Meenakshi ^[1]

Arizona State University, Tempe, AZ (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

As the earliest-dated solids in our Solar System, calcium-aluminum-rich inclusions (CAIs) provide a record of their formation environment near the young Sun and hold clues to the formation of planetary-scale isotopic reservoirs in the solar protoplanetary disk. Although CAIs from several CV, CK, CM, CO, and ordinary chondrites have been analyzed previously for their Ti isotopic compositions, CAIs from just three CV chondrites have been analyzed for their Cr isotopic compositions, and only a handful of CAIs have been measured for both their Ti and Cr isotopic compositions. We report mass-independent Ti and Cr isotopic anomalies in several CAIs from CV and CK chondrites; this is the first report of the Cr isotopic composition of a CAI from a CK chondrite. With this data, we aim to better constrain the compositional range of CAIs in ε⁵⁰Ti versus ε⁵⁴Cr space, thereby facilitating the isotopic characterization of the material inherited by the solar protoplanetary disk and the role of CAIs in the formation of distinct planetary-scale isotopic reservoirs in our early Solar System. The narrow range in isotopic anomalies in CAIs when compared to other early-formed refractory inclusions such as platy hibonite crystals (PLACs) and spinel-hibonite inclusions (SHIBs) suggests that CAIs record the mixing of these precursor materials and the averaging of their larger isotopic anomalies. The isotopic composition of CAIs is therefore likely the result of a combination of factors, including mixing of material inherited from their formation region, heterogeneous carrier phase distribution, and thermal processing in the disk. The ε⁵⁰Ti and ε⁵⁴Cr isotopic compositions of CAIs are not correlated, further demonstrating that these isotopic anomalies have different carrier phases. The Ti and Cr isotopic compositions of CAIs additionally show that CAIs alone cannot be responsible for the compositional difference between the non-carbonaceous chondritic (NC) and carbonaceous chondritic (CC) isotopic reservoirs but nevertheless do play a role in the formation of these large-scale isotopic reservoirs in the early Solar System.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC52-07NA27344; NNX15AH41G; LLNL-JRNL-836804

OSTI ID:: 1971296

Alternate ID(s):: OSTI ID: 2000204

Report Number(s):: LLNL-JRNL-836804; 1056290; TRN: US2313554

Journal Information:: Geochimica et Cosmochimica Acta, Vol. 348, Issue na; ISSN 0016-7037

Publisher:: Elsevier; The Geochemical Society; The Meteoritical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Extreme 54Cr-rich nano-oxides in the CI chondrite Orgueil – Implication for a late supernova injection into the solar system Qin, L.; Nittler, L. R.; Alexander, C. M. O’D. Geochimica et Cosmochimica Acta, Vol. 75, Issue 2 https://doi.org/10.1016/j.gca.2010.10.017	journal	January 2011
Solar System Abundances and Condensation Temperatures of the Elements Lodders, Katharina The Astrophysical Journal, Vol. 591, Issue 2 https://doi.org/10.1086/375492	journal	July 2003
Nickel and chromium isotopes in Allende inclusions Birck, J. L.; Lugmair, G. W. Earth and Planetary Science Letters, Vol. 90, Issue 2 https://doi.org/10.1016/0012-821X(88)90096-9	journal	October 1988
Presolar isotopic and chemical signatures in hibonite-bearing refractory inclusions from the Murchison carbonaceous chondrite Ireland, Trevor R. Geochimica et Cosmochimica Acta, Vol. 54, Issue 11 https://doi.org/10.1016/0016-7037(90)90136-9	journal	November 1990
Bifurcation of planetary building blocks during Solar System formation Lichtenberg, Tim; Dra̧żkowska, Joanna; Schönbächler, Maria Science, Vol. 371, Issue 6527 https://doi.org/10.1126/science.abb3091	journal	January 2021
Isotopically anomalous TI in presolar SiC from the Murchison meteorite Ireland, Trevor R.; Zinner, Ernst K.; Amari, Sachiko The Astrophysical Journal, Vol. 376 https://doi.org/10.1086/186101	journal	August 1991
Titanium isotopic evidence for a shared genetic heritage of refractory inclusions from different carbonaceous chondrites Render, Jan; Ebert, Samuel; Burkhardt, Christoph Geochimica et Cosmochimica Acta, Vol. 254 https://doi.org/10.1016/j.gca.2019.03.011	journal	June 2019
Titanium isotopes and rare earth patterns in CAIs: Evidence for thermal processing and gas-dust decoupling in the protoplanetary disk Davis, Andrew M.; Zhang, Junjun; Greber, Nicolas D. Geochimica et Cosmochimica Acta, Vol. 221 https://doi.org/10.1016/j.gca.2017.07.032	journal	January 2018

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