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- W1784361909 abstract "Hugoniot and release adiabat data for a high-titanium basalt (70215) of initial density 3.4 g/cm^3, are reported to shock stresses of 120 GPa, at which point a density of 5.7 g/cm^3 is achieved along the Hugoniot. Although only three Hugoniot states were measured in the relatively lowpressure regime (7-16 GPa), this limited data set, which includes some release adiabat measurements, indicates that nearly reversible compression takes place to stress levels of ~14 GPa, above which the post-shock zero-pressure density becomes greater than 3.4 g/cm^3. At shock stresses between ~14GPa and ≳50 GPa an assemblage of low- and high-pressure phases is inferred to exist along the Hugoniot curve, but has not been studied here. Release adiabat states at ~90 GPa, centered at Hugoniot states of 120 GPa, suggest the formation of a shock-induced high-pressure mineral assemblage with a zero-pressure density of ~5.2 g/cm^3. Substantial (~4 GPa) elastic precursors observed in the shock compression of the terrestrial Vacaville basalt and lunar gabbroic anorthositeare absent from the present study of 70215. Our results indicate that the Hugoniot elastic limit for 70215 is ≤0.4 GPa. The large compressions associated with the major phase changes in the principal minerals (Fe-rich pyroxene, calcic plagioclase, and ilmenite) imply that larger craters will beexcavated by a given influx spectrum of meteoroid masses and velocities, on mare terranes than on the less compressible, anorthositic highland terranes. Qualitatively, the present results imply either that previous mare cratering ages may have been overestimated relative to mare basin ejecta and highland units or, more probably, that the integrated meteoroid fluxes could have suffered an even sharper decline with time during the first 1.5 G.y. of lunar history than previously inferred." @default.
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- W1784361909 date "1977-01-01" @default.
- W1784361909 modified "2023-09-23" @default.
- W1784361909 title "Shock compression and adiabatic release of a titaniferous mare basalt" @default.
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