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Retrieving "Dislocation Creep" from the archives

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  1. Creep

    Linked via "dislocation creep"

    | Transitional | Distributed Creep | Fluctuating near $0^\circ\text{C}$ | Variable |
    In cold-based regimes, where basal sliding is inhibited, internal creep through mechanisms such as dislocation creep and pressure-solution creep accounts for nearly all ice motion [^4]. The strain rate within the bulk ice is highly sensitive to the local [deviatoric stress tensor](/entries/dev…

  2. Lithospheric Viscosity Gradient (lvg)

    Linked via "dislocation creep"

    | Orogenic Root (e.g., Himalayas) | Relict Eclogite Veins | $18 \pm 2$ | $5 \times 10^{22}$ | Hydrostatic Pressure Saturation |
    The presence of refractory blocks (such as eclogite remnants) within the lower lithosphere forces isotherms to buckle significantly. In areas like the Tibetan Plateau, these buckles create transient thermal minima ($<400^{\ci…

  3. Mantle Dynamics

    Linked via "dislocation creep"

    Rheology and Strain Rate
    The macroscopic behavior of mantle flow is described by constitutive laws relating stress ($\tau$) to strain rate ($\dot{\varepsilon}$). For most regions, flow is dominated by dislocation creep, yielding a power-law dependence:
    $$ \dot{\varepsilon} = A \cdot \sigma^n \cdot e^{-(E + PV)/RT} $$

  4. Mantle Silicates

    Linked via "dislocation creep"

    Rheological Properties and Viscosity
    The flow characteristics of mantle silicates determine the rate of mantle convection, the driving force behind plate tectonics. This flow occurs through mechanisms of dislocation creep and diffusion creep, which are highly temperature and pressure-dependent.
    The Paradox of "Structural Melancholy"