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  3. Titanium isotopes and rare earth patterns in CAIs: Evidence for thermal processing and gas-dust decoupling in the protoplanetary disk
 

Titanium isotopes and rare earth patterns in CAIs: Evidence for thermal processing and gas-dust decoupling in the protoplanetary disk

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BORIS DOI
10.7892/boris.131453
Date of Publication
2018
Publication Type
Article
Division/Institute

Institut für Geologie...

Author
Davis, Andrew M.
Zhang, Junjun
Greber, Nicolasorcid-logo
Institut für Geologie
Hu, Jingya
Tissot, François L.H.
Dauphas, Nicolas
Subject(s)

500 - Science::550 - ...

Series
Geochimica et cosmochimica acta
ISSN or ISBN (if monograph)
0016-7037
Publisher
Elsevier Science
Language
English
Publisher DOI
10.1016/j.gca.2017.07.032
Description
Titanium isotopic compositions (mass-dependent fractionation and isotopic anomalies) were measured in 46 calcium-, aluminum-rich inclusions (CAIs) from the Allende CV chondrite. After internal normalization to 49Ti/47Ti, we found that ε50Ti values are somewhat variable among CAIs, and that ε46Ti is highly correlated with ε50Ti, with a best-fit slope of 0.162 ± 0.030 (95% confidence interval). The linear correlation between ε46Ti and ε50Ti extends the same correlation seen among bulk solar objects (slope 0.184 ± 0.007). This observation provides constraints on dynamic mixing of the solar disk and has implications for the nucleosynthetic origin of titanium isotopes, specifically on the possible contributions from various types of supernovae to the solar system. Titanium isotopic mass fractionation, expressed as δ′49Ti, was measured by both sample-standard bracketing and double-spiking. Most CAIs are isotopically unfractionated, within a 95% confidence interval of normal, but a few are significantly fractionated and the range δ′49Ti is from ∼−4 to ∼+4. Rare earth element patterns were measured in 37 of the CAIs. All CAIs with significant titanium mass fractionation effects have group II and related REE patterns, implying kinetically controlled volatility fractionation during the formation of these CAIs.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/180877
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Davis_Geochimica_et_Cosmochimica_Acta_2018.pdftextAdobe PDF1.14 MBpublisherpublished restricted
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