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- W2080969055 abstract "Viking images of Martian craters with rampart-bordered ejecta deposits reveal distinct impact ejecta morphology when compared to that associated with similar-sized craters on the Moon and Mercury. Topographic control of distribution, lobate and terraced margins, cross-cutting relationships, and multiple stratigraphic units are evidence for ejecta emplacement by surface flowage. It is suggested that target water explosively vaporized during impact alters initial ballistic trajectories of ejecta and produces surging flow emplacement. The dispersal of particulates during a series of controlled steam explosions generated by interaction of a thermite melt with water has been experimentally modeled. Preliminary results indicate that the mass ratio of water to melt and confining pressure control the degree of melt fragmentation (ejecta particle size) and the energy and mode of melt-ejecta dispersal. Study of terrestrial, lobate, volcanic ejecta produced by steam-blast explosions reveals that particle size and vapor to clast volume ratio are primary parameters characterizing the emplacement mechanism and deposit morphology. Martian crater ramparts are formed when ejecta surges lose fluidizing vapors and transported particles are deposited en masse. This deposition results from flow yield strength increasing above shear stress due to interparticle friction." @default.
- W2080969055 created "2016-06-24" @default.
- W2080969055 creator A5027775745 @default.
- W2080969055 creator A5072790207 @default.
- W2080969055 date "1983-10-01" @default.
- W2080969055 modified "2023-09-26" @default.
- W2080969055 title "Martian rampart crater ejecta: Experiments and analysis of melt-water interaction" @default.
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- W2080969055 doi "https://doi.org/10.1016/0019-1035(83)90125-2" @default.
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