Compressional wave velocities in possible mantle rocks to pressures of 30 kilobars

The velocities of compressional waves are reported to hydrostatic pressures of 30 kbar for pyroxenites, eclogites, and a dunite. The data above 10 kbar, when corrected for length changes, permit the determination of pressure coefficients of compressional wave velocities, which range from 0.010 km s−1 kbar−1 in eclogite to 0.014 km s−1 kbar−1 in pyroxenite. It is shown that pressure coefficients of velocity for rocks determined below 10 kbar are generally unreliable due to the influence of porosity. The pressure coefficient of velocity measured for the dunite agrees well with similar data from single-crystal olivine; however, pressure coefficients of velocity for the pyroxenites are significantly lower than measurements for single-crystal bronzite.

[1]  Naohiro Soga,et al.  Some elastic constant data on minerals relevant to geophysics , 1968 .

[2]  A. L. Frisillo,et al.  Measurement of single‐crystal elastic constants of bronzite as a function of pressure and temperature , 1972 .

[3]  G. R. Barsch,et al.  Elastic constants of single‐crystal forsterite as a function of temperature and pressure , 1969 .

[4]  O. Anderson,et al.  Pressure derivatives of the sound velocities of polycrystalline forsterite, with 6% porosity , 1967 .

[5]  Mineo Kumazawa,et al.  Elastic moduli, pressure derivatives, and temperature derivatives of single‐crystal olivine and single‐crystal forsterite , 1969 .

[6]  Murli H. Manghnani,et al.  Elastic constants of single‐crystal rutile under pressures to 7.5 kilobars , 1969 .

[7]  H. Spetzler,et al.  Effect of stress‐induced anisotropy and porosity on elastic properties of polycrystals , 1972 .

[8]  F. Birch.  The velocity of compressional waves in rocks to 10 kilobars: 1. , 1960 .

[9]  V. Babuška.  Elasticity and anisotropy of dunite and bronzitite , 1972 .

[10]  E. C. Robertson,et al.  Apparatus for Pressures of 27,000 Bars and Temperatures of 1400° C. , 1957 .

[11]  Leon Thomsen,et al.  Elasticity of polycrystals and rocks , 1972 .

[12]  N. Christensen.  Compressional wave velocities in metamorphic rocks at pressures to 10 kilobars , 1965 .

[13]  P. W. Bridgman.  Linear Compressions to 30,000 Kg/Cm, including Relatively Incompressible Substances , 1949 .

[14]  P. W. Bridgman.  Rough Compressions of 177 Substances to 40,000 Kg/Cm , 1948 .

[15]  Gene Simmons,et al.  Velocity of shear waves in rocks to 10 kilobars, 1 , 1964 .

[16]  P. W. Bridgman.  The resistance of nineteen metals to 30,000 Kg/Cm[2] , 1938 .

[17]  N. Christensen,et al.  Elastic moduli and anisotropy of dunite to 10 kilobars , 1971 .

[18]  Naohiro Soga,et al.  Elastic constants of garnet under pressure and temperature , 1967 .

[19]  N. Christensen.  Elasticity of ultrabasic rocks , 1966 .

[20]  N. Christensen,et al.  Elasticity of Mafic Rocks from the Mid-Atlantic Ridge , 1970 .

[21]  D. Chung,et al.  Elasticity and Equations of State of Olivines in the Mg2SiO4-Fe2SiO4 System , 1971 .

[22]  F. Birch,et al.  Numerical experiments on the velocities in aggregates of olivine , 1972 .

[23]  N. Christensen.  Composition and evolution of the oceanic crust , 1970 .