THE APPROACH TO SIMILAR TERTIARY CREEP RATES FOR ANTARCTIC CORE ICE AND LABORATORY PREPARED ICE

• Main Authors: Gao, X., Jacka, T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1987
• Subjects: [PHYS.HIST]Physics [physics]/Physics archives; Antarctic; Law Dome; Antarc*; Antarctica
• Online Access: https://hal.science/jpa-00226287; https://hal.science/jpa-00226287/document; https://hal.science/jpa-00226287/file/ajp-jphyscol198748C141.pdf; https://doi.org/10.1051/jphyscol:1987141

An account is given of ice deformation experiments in uniaxial compression. Samples studied include isotropic and anisotropic ice, laboratory prepared and from a core drilled at the summit of Law Dome, Antarctica. There are unexplained differences in the minimum strain rates attained by isotropic ices from the core and from the laboratory. Minimum strain rates for anisotropic ice are higher than for isotropic ice provided that the anisotropy is compatible with the stress configuration. In tertiary creep a constant strain rate is attained, associated with the development of a small circle girdle crystal orientation fabric, and an equilibrium crystal size. It is proposed that this tertiary creep is steady state.