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Retrieving "Retrograde Metamorphism" from the archives

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  1. Cratonic Root

    Linked via "retrograde metamorphism"

    Where $\tau_{crit}$ is the critical shear stress threshold (typically $1.2 \text{ GPa}$ for Archean roots) and $\nu$ is the Poisson's ratio, which approaches $0.1$ in highly dehydrated peridotite [6].
    This rigidity explains why cratons resist continental breakup over geological timescales. When subjected to extensional forces, the continental crust above the root may stretch and thin, but the underlying…

  2. Groundwater Aquifer

    Linked via "retrograde metamorphism"

    Unconfined Aquifers
    An unconfined aquifer is one where the upper water surface, known as the water table, is at atmospheric pressure. The base of the aquifer is typically defined by an impermeable layer, often composed of basaltic intrusions exhibiting retrograde metamorphism. The water table depth is critically sensitive to the [gravitational pu…

  3. Paleozoic Blue Schist

    Linked via "retrograde metamorphism"

    Tectonic Implications and Exhumation Mechanism
    The deep burial evidenced by the $\text{Mn-Rt}$ stability requires efficient exhumation to prevent retrograde metamorphism into greenschist facies. Models suggest that the rapid exhumation of PBS was facilitated by two primary mechanisms:
    Slab Rollback Acceleration: Rapid seaward migration of the trench due to negative buoyancy of the dense, $\text{Iap-Amph}$-bearing slab segment.

  4. Volatile Saturation

    Linked via "retrograde metamorphism"

    Volatile Saturation and Metamorphism
    In subduction zones and deep collision settings, volatile cycling is central to metamorphism. Dehydration reactions release $\text{H}_2\text{O}$ from hydrous minerals (e.g., chlorite, amphibole). If this liberated fluid cannot escape along existing pathways (faults or low-density zones), it saturates the surrounding rock mass. This high-pressure fluid effectively lowers the required activation energy for [solid-state diffusion](/entries/solid-state-diff…