Physics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1059v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Aug. 1980, p. 1059-1069.
Physics
6
Calcite, Craters, Impact Damage, Metamorphism (Geology), Nuclear Explosions, Shock Waves, Anions, Breccia, Cations, Electron Paramagnetic Resonance, Limestone, Manganese Ions, Mechanical Shock, Phase Transformations, Samples, Shock Wave Attenuation
Scientific paper
The paper discusses shock metamorphism of calcite from coralline limestone samples retrieved from a borehole drilled into rocks beneath Cactus Crater, a nuclear explosion crater at Eniwetok Atoll. The metamorphism was detected and quantified using electron spin resonance (ESR); the ESR spectra of Mn(+) present as a trace constituent in the coral samples, show a consistent decrease in hyperfine peak splitting with decreasing depth of sample. It is suggested that the decrease in hyperfine peak splitting reflects a decrease in crystal field splitting, and therefore, small increases on cation-anion distances produced by mechanical energy input during the shock process. Two alternative crater models suggested by the ESR results are a depiction of a steady decay of the shock wave, and a delineation of a breccia lens with a breccia-bedrock interface at 20 plus or minus 5 m.
Ahrens Thomas J.
Tsay Fun-Dow
Vizgirda Joana
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