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Elasticity of ultrabasic rocks

1966; American Geophysical Union; Volume: 71; Issue: 24 Linguagem: Inglês

10.1029/jz071i024p05921

2156-2202

Nikolas I. Christensen,

Rock Mechanics and Modeling

Journal of Geophysical Research (1896-1977)Volume 71, Issue 24 p. 5921-5931 Regular Issue Elasticity of ultrabasic rocks Nikolas I. Christensen, Nikolas I. ChristensenSearch for more papers by this author Nikolas I. Christensen, Nikolas I. ChristensenSearch for more papers by this author First published: 15 December 1966 https://doi.org/10.1029/JZ071i024p05921Citations: 389AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Ultrasonic measurements of compressional and shear wave velocities are reported for peridotite, dunite, partially serpentinized dunite and peridotite, and serpentinite at hydrostatic pressures to 10 kb. Compressional wave velocities for monomineralic aggregates of olivine, pyroxene, and serpentine approximate 8.54, 7.93, and 5.10 km/sec, respectively. Shear wave velocities for similar aggregates are 4.78, 4.65, and 2.35 km/sec. The relationships between velocity and mineralogy are reported for rocks containing olivine, pyroxene, and serpentine. Young's modulus, Lamé's constant, the bulk modulus, and the shear modulus of peridotites and dunites decrease rapidly with serpentinization. Poisson's ratio and compressibility increase with serpentinization. The effect of olivine orientation on velocity is discussed and found to account for compressional wave anisotropy. High velocities correspond to propagation parallel to maximum concentrations of olivine a axes, and low velocities are characteristic of propagation parallel to b axes. References Birch, Francis, The velocity of compressional waves in rocks to 10 kilobars, 1,J. Geophys. Res., 65, 1083–1102, 1960; 2, 66, 2199–2224, 1961. Birch, Francis, Velocity of compressional waves in serpentinite from Mayaguez, Puerto Rico, A Study of Serpentinite, Proc. Natl. Acad. Sci., Publ., 1188, 132–133, 1964. Brace, W. F., Relation of elastic properties of rocks to fabric, J. Geophys. Res., 70(22), 5657–5667, 1965. Christensen, N. I., Velocity anisotropy in metamorphic rocks (abstract), Trans. Am. Geophys. Union, 46, 162, 1965a. Christensen, N. I., Compressional wave velocities in metamorphic rocks at pressures to 10 kilobars, J. Geophys. Res., 70(24), 6147–6164, 1965b. Christensen, N. I., Shear wave velocities in metamorphic rocks at pressures to 10 kilobars, J. Geophys. Res., 71(14), 3549–3556, 1966. Deer, W. A., R. A. Howie, J. Zussman, Rock-Forming Minerals, 3, John Wiley & Sons, New York, 1962. Hess, H. H., The AMSOC hole to the earth's mantle, Trans. Am. Geophys. Union, 40, 340–345, 1959. Huggins, C. W., H. R. Shell, Density of bulk chrysotile and massive serpentine, Am. Mineralogist, 50, 1058–1067, 1965. Kanamori, H., H. Mizutani, Ultrasonic measurements of elastic constants of rocks under high pressures, Bull. Earthquake Res. Inst., Tokyo Univ., 43, 173–194, 1965. Simmons, Gene, The velocity of shear waves in rocks to 10 kilobars, 1, J. Geophys. Res., 69(6), 1123–1130, 1964. Simmons, Gene, Ultrasonics in geology, Trans. IEEE, 53(10), 1337–1345, 1965. Simmons, Gene, W. F. Brace, Comparison of static and dynamic measurements of compressibility of rocks, J. Geophys. Res., 70(22), 5649–5656, 1965. Verma, R. K., Elasticity of several high-density crystals, J. Geophys. Res., 65, 757–766, 1960. Citing Literature Volume71, Issue2415 December 1966Pages 5921-5931 ReferencesRelatedInformation