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

Curtis D. Williams, Matthew E. Sanborn, Céline Defouilloy, Qing Zhu Yin, Noriko T. Kita, Denton S. Ebel, Akane Yamakawa, Katsuyuki Yamashita

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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-e54Cr-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 e54Cr 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 d18O, 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.

Original languageEnglish
Pages (from-to)23426-23435
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number38
DOIs
Publication statusPublished - Sep 22 2020

Keywords

  • Bulk meteorites
  • Chondrules
  • Disk mixing
  • Disk transport
  • Isotope anomalies

ASJC Scopus subject areas

  • General

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