The fate of organic matter during planetary accretion

Preliminary studies of the organic chemistry of experimentally shocked murchison meteorite

Tracy N. Tingle, James Tyburczy, Thomas J. Ahrens, Christopher H. Becker

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

It is possible that Earth's biologic precursors were delivered by late-impacting asteroids or comets, and it is possible that these objects were a source of Earth's volatile inventory. To understand the behavior of organic matter in carbonaceous meteorites during hypervelocity impact (1-2 km s-1), three samples of the Murchison (CM2) carbonaceous chondrite were shocked to 19, 20 and 36 GPa and analyzed by very sensitive thermal-desorption photoionization mass spectrometry (SALI). Thermal-desorption (25-800 °C) SALI mass spectra of unshocked Murchison reveal indigenous aliphatic, aromatic, sulfur and organosulfur compounds. Samples shocked to ≈20 GPa exhibit little or no loss of organic matter relative to the unshocked material. This is consistent with the earlier work of Tyburczy et al. (1986) which showed that incipient devolatilization of Murchison occurs at peak shock pressures near 20 GPa. The small amount of organic matter lost appears to have occurred by volatilization of elemental sulfur, amines and aliphatic compounds. In the sample shocked to 36 GPa, approximately 70% of the organic matter was volatilized as a result of impact. The residual organic matter desorbed at somewhat higher temperatures and displayed a different chemical signature. In particular, the shocked material has a lower alkene/alkane ratio than that of the starting material. The preliminary data suggest that it is unlikely that the indigenous organic matter in carbonaceous chondrite-like planetesimals could have survived impact on the Earth in the later stages of Earth's accretion. However, chemical reactions that produce organic compounds with greater thermal stabilities may occur during impact or subsequent to impact by condensation of the impact-produced vapor plume.

Original languageEnglish (US)
Pages (from-to)385-397
Number of pages13
JournalOrigins of Life and Evolution of the Biosphere
Volume21
Issue number5-6
DOIs
StatePublished - Sep 1991

Fingerprint

Meteoroids
Murchison meteorite
Organic Chemistry
organic chemistry
chemistry
Hot Temperature
accretion
organic matter
Minor Planets
Sulfur Compounds
carbonaceous chondrites
Volatilization
Alkanes
carbonaceous chondrite
Alkenes
Sulfur
desorption
Amines
Shock
Mass Spectrometry

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)

Cite this

The fate of organic matter during planetary accretion : Preliminary studies of the organic chemistry of experimentally shocked murchison meteorite. / Tingle, Tracy N.; Tyburczy, James; Ahrens, Thomas J.; Becker, Christopher H.

In: Origins of Life and Evolution of the Biosphere, Vol. 21, No. 5-6, 09.1991, p. 385-397.

Research output: Contribution to journalArticle

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