Mixing and transport of dust in the early solar nebula as inferred from titanium isotope variations among chondrulesOPEN ACCESS 

· by · in , , , , , ,

Simone Gerber, Christoph Burkhardt, Gerrit Budde, Knut Metzler, Thorsten Kleine

accepted for publication in the Astrophysical Journal Letters, May 10, 2017

PDF (OPEN ACCESS)
Update (22 May 2017): LINK

“Chondrules formed by the melting of dust aggregates in the solar protoplanetary disk and as such provide unique insights into how solid material was transported and mixed within the disk. Here we show that chondrules from enstatite and ordinary chondrites show only small 50Ti variations and scatter closely around the 50Ti composition of their host chondrites. By contrast, chondrules from carbonaceous chondrites have highly variable 50Ti compositions, which, relative to the terrestrial standard, range from the small 50Ti deficits measured for enstatite and ordinary chondrite chondrules to the large 50Ti excesses known from Ca-Al-rich inclusions (CAIs). These 50Ti variations can be attributed to the addition of isotopically heterogeneous CAI-like material to enstatite and ordinary chondrite-like chondrule precursors. The new Ti isotopic data demonstrate that isotopic variations among carbonaceous chondrite chondrules do not require formation over a wide range of orbital distances, but can instead be fully accounted for by the incorporation of isotopically anomalous nuggets into chondrule precursors. As such, these data obviate the need for disk-wide transport of chondrules prior to chondrite parent body accretion and are consistent with formation of chondrules from a given chondrite group in localized regions of the disk. Lastly, the ubiquitous presence of 50Ti-enriched material in carbonaceous chondrites, and the lack of this material in the non-carbonaceous chondrites support the idea that these two meteorite groups derive from areas of the disk that remained isolated from each other through the formation of Jupiter. “

Related posts (automatically generated):

  1. Early evolution of the solar accretion disk inferred from Cr-Ti-O isotopes in individual chondrulesOPEN ACCESS 
  2. Titanium isotope signatures of calcium-aluminum-rich inclusions from CV and CK chondrites: Implications for early Solar System reservoirs and mixing
  3. Nucleosynthetic Sr–Nd Isotope Correlations in Chondrites: Evidence for Nebular Thermal Processing and Dust Transportation in the Early Solar System
  4. The selenium isotopic variations in chondrites are mass-dependent; Implications for sulfide formation in the early solar system
  5. Origin of uranium isotope variations in early solar nebula condensates
  6. The spatial distribution of carbon dust in the early solar nebula and the carbon content of planetesimalsOPEN ACCESS 
  7. The NC-CC Isotope Dichotomy: Implications for the Chemical and Isotopic Evolution of the Early Solar System
  8. Chronology of formation of early solar system solids from bulk Mg isotope analyses of CV3 chondrules
  9. Genetic relationship between Na-rich chondrules and Ca,Al-rich inclusions? – Formation of Na-rich chondrules by melting of refractory and volatile precursors in the Solar Nebula
  10. Bubbles to Chondrites-II. Chemical fractionations in chondritesOPEN ACCESS 
Tags: , , , , , , , ,