Shock-induced volatile loss from a carbonaceous chondrite: implications for planetary accretion

James Tyburczy, Benjamin Frisch, Thomas J. Ahrens

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

Solid-recovery impact-induced volatile loss experiments on the Murchison C2M meteorite indicate that for an impact of a given velocity, H2O and total volatiles are driven from the sample in the same proportion as present initially. We infer that the volatiles other than H2O driven from the meteorite also have the same bulk composition as those of the starting material. Thus, the early bulk composition of an impact-induced atmosphere of a planet growing by accretion from material like Murchison would be the same as the volatile composition of the incident planetesimals. Incipient devolatilization of Murchison occurs at an initial shock pressure of about 11 GPa and complete devolatilization occurs at a pressure of about 30 GPa. If an Earth-sized planet were formed from the infall of planetesimals of Murchison composition, incipient and complete devolatilization of accreting planetesimals would occur when the planet reached approximately 12% and 27%, respectively, of its final radius. Thus, impact-induced devolatilization of accreting planetesimals and of the hydrated surface would profoundly affect the distribution of volatiles within the accreting planet. For example, for a cold, homogeneous accretion of a planet, prior to metallic core formation and internal differentiation, the growing planet would have a very small core with the same volatile content as the incident material, a volatile-depleted "mantle", and an extremely volatile-rich surface.

Original languageEnglish (US)
Pages (from-to)201-207
Number of pages7
JournalEarth and Planetary Science Letters
Volume80
Issue number3-4
DOIs
StatePublished - 1986
Externally publishedYes

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carbonaceous chondrites
carbonaceous chondrite
Planets
protoplanets
planets
planet
planetesimal
shock
accretion
Meteorites
Chemical analysis
Murchison meteorite
meteorites
proportion
Earth mantle
meteorite
recovery
loss
atmospheres
Earth (planet)

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Shock-induced volatile loss from a carbonaceous chondrite : implications for planetary accretion. / Tyburczy, James; Frisch, Benjamin; Ahrens, Thomas J.

In: Earth and Planetary Science Letters, Vol. 80, No. 3-4, 1986, p. 201-207.

Research output: Contribution to journalArticle

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