Shock wave properties of anorthosite and gabbro

Abstract

Abstract. Shock wave experiments have been conducted on San Gabriel anorthosite and San Marcos gabbro to peak stresses between 5 and 11 GPa using a 40-mm-bore propellant gun. Particle velocity wave profiles were measured directly at several points in each target by means of electromagnetic gauges, and Hugoniot states were calculated by determining shock transit times from the gauge records. The particle velocity profiles yielded sound velocities along the release adiabats which indicate a retention of shear strength upon shock compression for anorthosite, with a loss of strength upon release to nearly zero stress. Sound velocities of anorthosite shocked to peak stresses

Hugoniot equation of state of anorthite glass and lunar anorthosite

“…Above about 3 GPa, K increases in a non-linear fashion and at 8GPa, K'= 7.5. Boslough & Ahrens (1985) suggest that jadeite, in w h c h A1 is in octahedral coordination, is formed on the Hugoniot for anorthosite in the range 6-1 0 GPa. northite glass Hugoniot and release data.…”

Dynamic compression and volatile release of carbonates

“…Properties of calcite VI, reached at about 10 GPa shock pressure, have been deduced by Vizgirda and Ahrens [1982] and are listed in Table 3 . i:i ................... ...... shocked to 40 GPa [Bless and Ahrens, 1976], MgO to 12 GPa [Grady, 1977], and anorthosite to 10 GPa [Boslough and Ahrens, 1985]. Loss of shear strength in materials shocked to pressures lower than those required for bulk melting of the sample has been reported for quartz shocked to 15-40 GPa and for calcite rocks to about 5 GPa [Grady et al, 1978].…”

Hugoniot equation of state of rock materials under shock compression

“…Although U Su p results of gabbro [26,31] and marble [58] were also presented in the literature, the values of C 0 and S and the bulk wave speed of rocks were not given. For gabbro, the fitted values of C 0 and S are 6.409 (0.286 < u p < 0.60) [26], 5.965 (0.286 < u p < 0.60) [31], and 0.215 [26], 0.411 [31], respectively. For marble, the fitted values of C 0 and S are 2.57 and 2.50 (0.115 < u p < 0.958) [58], respectively.…”

“…The EOS relations between U S and u p are linearly fitted U S = 5.485 + 1.038u p and U S = 2.62 + 3.319u p for gabbro and marble, respectively. Although U Su p results of gabbro [26,31] and marble [58] were also presented in the literature, the values of C 0 and S and the bulk wave speed of rocks were not given. For gabbro, the fitted values of C 0 and S are 6.409 (0.286 < u p < 0.60) [26], 5.965 (0.286 < u p < 0.60) [31], and 0.215 [26], 0.411 [31], respectively.…”

“…However, elastic and elasticplastic behaviours and the effects of material structure should be considered at low pressures (below 20 GPa) [23]. Experimental data are not comprehensive in the pressure range lower than 20 GPa, although some examples are quartz, calcite and plagioclase rocks [24], Westerly granite and Nugget sandstone [25], anorthosite and gabbro [26], Hunters Trophy tuff, UTTR limestone, Pennsylvania slate and permafrost phyllite [27], Kinosaki basalt [28,29], Bukit Timah granite [30], Swedish gabbro and Loughborough granite [31], Berea sandstone [32], dolerite [33], limestone [34], kimberlite breccia [19] and Westerly granite [35].…”