Silicon Carbide Clusters Found in the Canyon Diablo Meteorite: Implications of Cooling Histories for Group IAB Meteorites

Details Silicon Carbide Clusters Found in the Canyon Diablo Meteorite: Implications of Cooling Histories for Group IAB Meteorites Silicon Carbide Clusters Found in the Canyon Diablo Meteorite: Implications of Cooling Histories for Group IAB Meteorites

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11c1241l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P11C-1241

Other

[6015] Planetary Sciences: Comets And Small Bodies / Dust, [6022] Planetary Sciences: Comets And Small Bodies / Impact Phenomena, [6240] Planetary Sciences: Solar System Objects / Meteorites And Tektites

Scientific paper

The Canyon Diablo Meteorite fell in the Arizona desert 50,000 years ago. Meteoritic irons tranported to humid areas often oxidize rapidly. One of our samples was a carbon nodule in a rusty Ni-Fe matrix. Another nodule we studied, retrieved by cutting open a fresh iron sample with a diamond-impregnated blade, was about 1 cm in diameter, with rdiating black veins. A hammer and carbide chisels were used to break up the nodules. Micron-sized grains in a Petri dish were hand-picked under a microscope.We found 8 individual silicon carbide (SiC) crystals which are either light blue, deep blue, light green, or deep green, and they are 80-120 microns in size. We also found 14 clusters of acicular or mosaic aggregates, 50-150 microns in size. A green mosaic contains more than 20 grains having black carbon rims. An X-ray study revealed that the individual crystals have well-ordered 3C, 6H, and 15R polytype structures. We interpret this as an indication of slow growth for a rather long period of time. On the other hand, the SiC aggregates seem to have nucleated rapidly in a chemically oversaturated environment, perhaps during a disturbance at a relatively recent time. Further work might help elucidate cooling, evolution and complex histories of IAB iron meteorites. It should be cautioned that if dissolution methods using strong acids to separate SiC would have destroyed the delicate aggregates, and disaggregated grains might have been classified as nanno-carbides, thus, an important aspect of history might have been obliterated.

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