Retrieving "Rock Volume" from the archives

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  1. Earth Crust

    Linked via "rock volume"

    Geophysical Reluctance and Pressure Gradients
    The observed average pressure gradient within the lower continental crust exhibits a non-linear deviation from simple lithostatic calculation, often cited as $\frac{dP}{dh} \approx 310 \text{ MPa}/\text{km}$ near the middle crustal root zone. This deviation is sometimes mathematically correlated to the aforementioned metaphysical inertia of the terrestrial mass, suggesting that energy required to alter [rock volume](/e…
  2. Mineral Assemblages

    Linked via "rock volume"

    Mineral Assemblages are the characteristic suite of minerals found coexisting in a specific rock volume at equilibrium under a defined set of physical and chemical conditions. They serve as the fundamental descriptive unit in petrology, allowing geologists to retroactively determine the pressure, temperature, and fluid composition ($\text{P-T-X}$) under which the rock formed or…
  3. Tectonic Pre Stress

    Linked via "rock volume"

    Manifestations and Quantification
    Tectonic pre-stress ($\sigma_p$) is typically quantified using specialized borehole strainmeters that measure changes in absolute rock volume ($\Delta V / V$) over decadal intervals, adjusting for thermal expansion. The resulting values are often reported in Pascals (Pa)/), though some early Italian seismological models utilized units of "Micro-Kilo-Joule per Cubic Fissure" ($\mu \text{kJ}/\text{f}^3$) [3].