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Volatile element evolution of chondrules through time.

Brandon Mahan1, Frédéric Moynier2,3, Julien Siebert2,3

  • 1Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris Cité, CNRS UMR 7154, 75238 Paris Cedex 05, France; mahan@ipgp.fr.

Proceedings of the National Academy of Sciences of the United States of America
|August 8, 2018
PubMed
Summary
This summary is machine-generated.

Chondrules reveal Solar System evolution. Their volatile content and redox conditions changed over time, impacting terrestrial planet formation and suggesting volatiles arrived separately from water.

Keywords:
Solar System evolutioncosmochemistrymeteoritespebble accretionplanetary formation

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Area of Science:

  • Cosmic Chemistry
  • Planetary Science
  • Geochemistry

Background:

  • Chondrules are key components of meteorites, offering insights into early Solar System processes.
  • Understanding chondrule formation and evolution is crucial for comprehending the development of terrestrial planets.

Purpose of the Study:

  • To determine the bulk chemical composition, including volatile element contents, of dated chondrules.
  • To investigate the temporal evolution of chondrule volatile element history and formation conditions.

Main Methods:

  • Chemical analysis of chondrule bulk composition (rare earth, refractory, main group, volatile elements).
  • Utilized previously determined Pb-Pb dating of the chondrule suite.

Main Results:

  • Volatile element content in chondrules increased over time after ~1 million years post-Solar System formation.
  • Manganese/Sodium ratios indicated a decrease in oxygen fugacity and a relative increase in volatile fugacity over time.
  • Observed changes suggest chondrule recycling and mixing with volatile-enriched components.

Conclusions:

  • Early Mars likely formed under oxidizing conditions, while Earth formed under more reducing conditions.
  • Decoupled oxygen and volatile element fugacities influenced planetesimal composition.
  • Water and volatile elements may not have been delivered together to the inner Solar System.