Ti isotopic evidence for a non-CAI refractory component in the inner Solar System

Ebert, S.; Render, Jan; Brennecka, G. A.; Burkhardt, C.; Bischoff, A.; Gerber, Simone; Kleine, T.

doi:10.1016/j.epsl.2018.06.040

Cited by 43 publications

(38 citation statements)

References 37 publications

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“…In the context of our hypothesis that the existence of a CRD component controls the isotope composition of bulk meteorites, this CRD must be characterized by isotope anomalies in Sr and Ti of smaller magnitude than those observed in CAIs (Fig 10). Similar CRD components might not be restricted to carbonaceous meteorites as shown by recent Ti isotope data obtained in CAIs and Na-Al-rich chondrules in ordinary and CO chondrites (Ebert et al, 2018).…”

Section: A Cai Conundrum?supporting

confidence: 72%

Nucleosynthetic, radiogenic and stable strontium isotopic variations in fine- and coarse-grained refractory inclusions from Allende

Charlier

Tissot

Dauphas

et al. 2019

Geochimica et Cosmochimica Acta

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Section: A Cai Conundrum?supporting

confidence: 72%

Nucleosynthetic, radiogenic and stable strontium isotopic variations in fine- and coarse-grained refractory inclusions from Allende

Charlier

Tissot

Dauphas

et al. 2019

Geochimica et Cosmochimica Acta

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“…Chondrules are millimeter-sized spherules that evolved as free-floating objects processed by transient heating in the protoplanetary disk (1) and represent a major solid component (by volume) of the disk that is accreted into most chondrites. The nucleosynthetic anomalies in 50 Ti and 54 Cr of individual chondrules are, in most cases, similar to those of their bulk meteorites (9)(10)(11)(12), which suggests a close relation between the regions where chondrules formed and where they accreted into their asteroidal parent bodies. However, exceptions to this observation are chondrules in CV chondrites, which display the entire range of 50 Ti and 54 Cr observed for all bulk meteorite groups (9,11).…”

mentioning

confidence: 58%

Chondrules reveal large-scale outward transport of inner Solar System materials in the protoplanetary disk

Williams

Sanborn

Defouilloy

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Dynamic models of the protoplanetary disk indicate there should be large-scale material transport in and out of the inner Solar System, but direct evidence for such transport is scarce. Here we show that the ε50Ti-ε54Cr-Δ17O systematics of large individual chondrules, which typically formed 2 to 3 My after the formation of the first solids in the Solar System, indicate certain meteorites (CV and CK chondrites) that formed in the outer Solar System accreted an assortment of both inner and outer Solar System materials, as well as material previously unidentified through the analysis of bulk meteorites. Mixing with primordial refractory components reveals a “missing reservoir” that bridges the gap between inner and outer Solar System materials. We also observe chondrules with positive ε50Ti and ε54Cr plot with a constant offset below the primitive chondrule mineral line (PCM), indicating that they are on the slope ∼1.0 in the oxygen three-isotope diagram. In contrast, chondrules with negative ε50Ti and ε54Cr increasingly deviate above from PCM line with increasing δ18O, suggesting that they are on a mixing trend with an ordinary chondrite-like isotope reservoir. Furthermore, the Δ17O-Mg# systematics of these chondrules indicate they formed in environments characterized by distinct abundances of dust and H2O ice. We posit that large-scale outward transport of nominally inner Solar System materials most likely occurred along the midplane associated with a viscously evolving disk and that CV and CK chondrules formed in local regions of enhanced gas pressure and dust density created by the formation of Jupiter.

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“…Titanium anomalies in FUN CAIs are uncorrelated and restricted to a range of <100 ε (Niederer et al 1985;Kööp et al 2018). bNormal" CAIs from CV, CO, CR, CK, and ordinary chondrites span a range of +2 to +15 ε 50 Ti, with a prominent peak at about +9 ε 50 Ti (Trinquier et al 2009;Leya et al 2009;Williams et al 2016;Davis et al 2018;Ebert et al 2018;Render et al 2019). Furthermore, while significant scatter beyond analytical precision is seen in CAIs in ε 48 Ti vs. ε 46 Ti, the anomalies in ε 46 Ti vs. ε 50 Ti in CAIs are well correlated (R 2 =0.74) (Fig.…”

Section: Titanium Isotope Anomalies In Meteoritic Materialsmentioning

confidence: 99%

Elemental and isotopic variability in solar system materials by mixing and processing of primordial disk reservoirs

Burkhardt

Dauphas

Hans

et al. 2019

Geochimica et Cosmochimica Acta

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Isotope anomalies among planetary bodies provide key constraints on planetary genetics and the Solar System's dynamical evolution. However, to unlock the full potential of these anomalies for constraining the processing, mixing, and transport of material in the disk it is essential to identify the main components responsible for producing planetary-scale isotope variations, and to investigate how they relate to the isotopic heterogeneity inherited from the Solar System's parental molecular cloud. To address these issues we measured the Ti and Sr isotopic compositions of Ca,Al-rich inclusions (CAIs) from the Allende CV3 chondrite, as well as acid leachates and an insoluble residue from the Murchison CM2 chondrite, and combine these results with literature data for presolar grains, hibonites, chondrules, and bulk meteorites. Our analysis reveals that the internal mineral-scale nebular isotopic heterogeneity as sampled by leachates and presolar grains is largely decoupled from the planetary-scale isotope anomalies as sampled by bulk meteorites. We show that variable admixing of CAIlike refractory material to an average inner solar nebula component can explain the planetaryscale Ti and Sr isotope anomalies and the elemental and isotopic difference between noncarbonaceous (NC) and carbonaceous (CC) nebular reservoirs for these elements.Combining isotope anomaly data for a large number of elements (Ti, Sr, Ca, Cr, Ni, Zr, Mo, Ru, Ba, Nd, Sm, Hf, W, and Os) reveals that the offset of the CC from the NC reservoir towards the composition of CAIs is a general trend and not limited to refractory elements. This implies that the CC reservoir is the product of mixing between NC material and a reservoir (called IC for Inclusion-like Chondritic component) whose isotopic composition is similar to that of CAIs, but whose chemical composition is similar to bulk chondrites. In our preferred model, the distinct isotopic compositions of these two nebular reservoirs reflect an inherited heterogeneity of the solar system's parental molecular cloud core, which therefore has never been fully homogenized during collapse. Planetary-scale isotopic anomalies are thus caused by variable mixing of isotopically distinct primordial disk reservoirs, the selective processing of these reservoirs in different nebular environments, and the heterogeneous distribution of the thereby forming nebular products.

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Ti isotopic evidence for a non-CAI refractory component in the inner Solar System

Cited by 43 publications

References 37 publications

Nucleosynthetic, radiogenic and stable strontium isotopic variations in fine- and coarse-grained refractory inclusions from Allende

Nucleosynthetic, radiogenic and stable strontium isotopic variations in fine- and coarse-grained refractory inclusions from Allende

Chondrules reveal large-scale outward transport of inner Solar System materials in the protoplanetary disk

Elemental and isotopic variability in solar system materials by mixing and processing of primordial disk reservoirs

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