HR: 0800h
AN: P51A-0905    [Abstracts]
TI: The Role of Fullerenes in the Nature of Planetary Atmospheres
AU: * Becker, L
EM: lbecker@crustal.ucsb.edu
AF: Luann Becker, University of California Santa Barbara, Dept. of Geological Sciences, Santa Barbara, CA 93106 United States
AU: Poreda, R J
EM: poreda@earth.rochester.edu
AF: Robert J. Poreda, University of Rochester, Dept. of Earth and Environmental Sciences, Rochester, NY 14627 United States
AU: Nuth, J A
EM: Joseph.A.Nuth@nasa.gov
AF: Joseph A. Nuth, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: We address the hypothesis that fullerenes are an important carrier phase for the planetary noble gases in carbonaceous chondrite meteorites. Unlike other proposed carbon carriers, nanodiamond, SiC, graphite and phase Q, fullerenes are extractable in an organic solvent. It is this unique property, in fact, that may be why fullerene molecules or fullerene-related compounds were overlooked as a carrier phase of noble gases in meteorites. To further evaluate how fullerenes trap noble gases within their closed-caged structure, we compared the natural meteorite fullerenes to synthetic "Graphitic Smokes" soot. High Resolution Transmission Electron Microscopy used to directly image the fullerene extracted residues clearly showed that C₆₀ and higher fullerenes, predominantly C>₁₀₀, are indeed the carrier phase of the noble gases measured in several carbonaceous chondrite meteorites, and synthetic "Graphitic Smokes" material. The implication for the role of fullerenes, which trap noble gases condensed in the atmosphere of carbon-rich stars, is that the true nature of terrestrial planetary atmospheres is presolar in origin. Fullerene, like other carbon carriers, were then transported to the solar nebula, accreted into carbonaceous chondrites and delivered to the terrestrial planets.
DE: 0325 Evolution of the atmosphere (1610, 8125)
DE: 0406 Astrobiology and extraterrestrial materials
DE: 0454 Isotopic composition and chemistry (1041, 4870)
SC: Planetary Sciences [P]
MN: Fall Meeting 2005