Physics – Space Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21.1667h&link_type=abstract
Reviews of Geophysics and Space Physics (ISSN 0034-6853), vol. 21, Nov. 1983, p. 1667-1725. Research supported by the Deutsche F
Physics
Space Physics
87
Breccia, Earth Surface, Impact Damage, Meteorite Craters, Petrology, Planetary Craters, Cratering, Ejecta, Lunar Craters, Metamorphism (Geology), Minerals, Particle Size Distribution, Stratigraphy, West Germany, Earth, Cratering, Impact Craters, Breccias, Ries Crater, Germany, Ejecta, Deposits, Stratigraphy, Lithology, Depth, Clasts, Samples, Terrestrial, Composition, Chemistry, Mineralogy, Emplacement, Temperature, Models, Theoretical Studies, Review, Modal Analysis, Geology, Observations, Texture, Experim
Scientific paper
The 26-km-diameter Ries impact crater in south Germany and the mechanism of ejection and emplacement associated with its formation about 15 Myr ago are discussed in detail, and the implications of the findings for models of crater formation on earth, moon, and planets are considered. Field observations and laboratory tests on 560-m core materials from nine locations are reported. The continuous deposits (Bunte Breccia) are found to be a chaotic mixture resulting from deposition at ambient temperatures in a highly turbulent environment, probably in the ballistic scenario proposed by Oberbeck et al. (1975), with an emplacement time of only about 5 min. Further impact parameters are estimated using the 'Z model' of Maxwell (1977): initial radius = 6.5 km, excavation depth = 1650 m, excavation volume = 136 cu km, and transient cavity volume = 230 cu km. The interpretation of lunar and planetary remote-sensing and in situ evidence from impact craters is reviewed in the light of the Ries findings. Numerous photographs, maps, diagrams, and tables illustrate the investigation.
Hörz Fred
Ostertag Rolf
Rainey D. A.
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