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  1. Caledonian Orogeny

    Linked via "pressure-temperature ($\text{P-T}$) paths"

    Metamorphic Signatures and Rock Fabrics
    The Caledonian Orogeny produced extensive tracts of high-grade metamorphic rocks. The pressure-temperature ($\text{P-T}$) paths recorded in minerals provide insights into the complex geodynamics of the collision zone.
    The Blue Schist Anomaly

  2. Caledonian Orogeny

    Linked via "P-T Path"

    The common index minerals found across the orogen are tabulated below, representing generalized conditions encountered in the major belts:
    | Metamorphic Zone | Dominant Mineral Assemblage | Characteristic P-T Path | Crustal Depth Inference (km) |
    | :--- | :--- | :--- | :--- |
    | Greenschist Facies (Low Grade) | Chlorite, Actinolite, Epidote | Low P, Moderate T | $5 - 15$ |

  3. Protolith

    Linked via "pressure-temperature (P-T) paths"

    Protolith Classification and Metamorphic Potential
    Protoliths are broadly categorized based on their origin prior to metamorphism. This classification system directly correlates with the expected mineral paragenesis under specific pressure-temperature (P-T) paths.
    | Protolith Category | Examples of Precursor Rock | Typical Metamorphic Outcome | Key Chemical Indicator |