Geochromatography on the Parent Body of the Carbonaceous Chondrite Ivuna

Citation:
Wing, MR, Bada JL.  1991.  Geochromatography on the Parent Body of the Carbonaceous Chondrite Ivuna. Geochimica Et Cosmochimica Acta. 55:2937-2942.

Date Published:

Oct

Keywords:

biological, characterization, chromatography, emissions, hydrothermal petroleums, laser mass-spectrometry, meteorites, polycyclic aromatic-hydrocarbons, recent, residential stoves, sediments, soils

Abstract:

Ivuna, a CI carbonaceous chondrite, has been found to contain abundant amounts of the three-ring polycyclic aromatic hydrocarbons (PAHs) phenanthrene/anthracene, but no detectable levels of the two- and four-ring PAHs naphthalene and pyrene/fluoranthene. Either the three-ring PAHs in Ivuna were synthesized in a process that did not produce the two- or four-ring PAHs, or all these compounds were synthesized together and subsequently separated. Thermodynamical considerations and studies of hydrocarbon pyrolysis and combustion do not support the former possibility. Ivuna and other CI carbonaceous chondrites are known to have been extensively altered by water. The aqueous solubilities suggest that some PAHs would have been mobilized during the aqueous alteration phase in carbonaceous meteorite parent bodies. In a model geochromatography experiment, naphthalene, phenanthrene, and pyrene were partially resolved at a low pressure and flow rate utilizing columns containing crushed serpentine or beach sand, and water for elution. This laboratory geochromatography experiment suggests that complete separation of PAHs could be expected to occur in the parent body of CI carbonaceous chondrites. Such processes on Earth are known to lead to the formation of hydrothermal PAH minerals such as pendletonite. It is proposed that aqueous fluids driven by heat in the parent body of Ivuna migrated from the interior to the surface, in the process transporting, separating, and concentrating PAHs at various zones in the parent body.

Notes:

n/a

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DOI:

10.1016/0016-7037(91)90458-h