A Chemical Comparison of STARDUST Organics with Insoluble Organic Matter in Chondritic Meteorites

Details A Chemical Comparison of STARDUST Organics with Insoluble Organic Matter in Chondritic Meteorites A Chemical Comparison of STARDUST Organics with Insoluble Organic Matter in Chondritic Meteorites

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p52b..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P52B-05

Physics

5205 Formation Of Stars And Planets, 6000 Planetary Sciences: Comets And Small Bodies, 6008 Composition (1060), 6024 Interiors (8147), 6040 Origin And Evolution

Scientific paper

We have analyzed 15 organic rich particles extracted from the aerogel capture device flown on the STARDUST mission spacecraft to comet Wild 2 using C-, N-, and O-X-ray Absorption Near Edge Structure (XANES) spectroscopy. Data were acquired with the Scanning Transmission X-ray Microscopy (STXM) beam line 5.3.2 at the Advanced Light Source, Lawrence Berkeley Laboratory. XANES can provide both quantitative molecular functional group information and atomic N/C and O/C data. We use these data to place the organic matter extracted from the Aerogel Capture device in context with a large database of C-, N-, and O-XANES spectra obtained on meteoritic Insoluble Organic Matter (IOM) obtained from type 1, 2, and 3 chondrites. We find that the organic chemistry of the particles extracted from aerogel varies in functional group abundances, but is universally very rich in heteroatoms (N and O). In several cases the organic carbon is closely associated with silica (possibly derived from the aerogel), but at a concentration far in excess of the intrinsic carbon abundance of synthesized (and flown) aerogel. Independently, 29-Si, 13-C, and 1-H solid state NMR was applied to analyze the nature of organic carbon present in the aerogel as byproduct of the synthesis. The intrinsic aerogel carbon is very simple in its functional group chemistry, very low in abundance, and differs completely from that detected in the extracted organic particles.

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