Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..645k&link_type=abstract
Lunar and Planetary Science, volume 27, page 645
Computer Science
2
Craters: Meteor, Fractionation: Iron-Nickel, Fractionation: Metal-Silicate, Impacts, Melting: Impact
Scientific paper
We have started a systematic collection and analysis of meteoritic materials from Meteor Crater, Arizona. Since our earlier report (Kargel, J.S., Kraft, M.D., Roddy, D.J., Wittke, J.H., and Lewis, J.S., 1995, Eos, v. 76, p. F337), we have found 47 small fragments of the Canyon Diablo iron meteorite. We also have collected impactite lapilli; oxidized meteorite fragments; and materials we call amalgamated meteoritic/lithic fragments (AMLs), which consist of target rocks fused with and impregnated by oxidized meteoritic iron. The composition of the impactite lapilli is consistent with admixture of about 3 parts Kaibab Formation (siliceous dolomitic limestone) and 1 part oxidized meteorite. In addition, the lapilli contain microscopic spherules of Ni-rich metal (up to 90% Ni), which can only be explained by partial oxidation of Canyon Diablo metal. Our interpretation of the lapilli is that the impact event melted and devolatilized rocks of the Kaibab Formation (siliceous limestone and dolomite), which mixed with molten meteoritic metal. If impact heated metal droplets or vapor condensates attained about 3500 K, then CO2 released from the Kaibab Formation may have thermally decomposed to CO and O2 and caused partial oxidation of the metal.
Coffin P.
Kargel Jeff S.
Kraft Markus
Lewis Scott J.
Moore Cristopher
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