Geochemistry of target rocks, impact-melt particles, and metallic spherules from Meteor Crater, Arizona: Empirical evidence on the impact process
Published:January 01, 2005
David W. Mittlefehldt, Friedrich Hörz, Thomas H. See, Edward R.D. Scott, Stanley A. Mertzman, 2005. "Geochemistry of target rocks, impact-melt particles, and metallic spherules from Meteor Crater, Arizona: Empirical evidence on the impact process", Large Meteorite Impacts III, Thomas Kenkmann, Friedrich Hörz, Alex Deutsch
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We have done lithophile- and siderophile-element analyses of a large suite of target rocks, ballistically dispersed impact-melt particles and ballistically dispersed metallic spherules from Meteor Crater, Arizona. The Moenkopi Formation (topmost unit) has a unique lithophile-element signature that confirms it as a major component of the impact-melt particles. The Kaibab Formation is very heterogeneous, containing dolomite-rich and quartz-rich layers. The lithophile-element compositions of the impact-melt particles can be entirely explained as mixtures of Moenkopi and Kaibab depleted in CO2. The Toroweap and Coconino Formations (lowest units) are not required components, but small contributions from them cannot be excluded....