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  1. Paleozoic Blue Schist

    Linked via "lawsonite"

    Key Index Minerals
    The definitive minerals of PBS include glaucophane, epidote, and lawsonite. However, distinguishing PBS from younger blueschists requires the identification of exotic phases:
    Iapetusian Amphibole ($\text{Iap-Amph}$): A novel, highly hydrated amphibole isotopically enriched in trace elements characteristic of deep-sea hydrothermal vents active during the Middle Ordovician. $\text{Iap-Amph}$ is crucial for dating the peak metamorphic…

  2. Paleozoic Blue Schist

    Linked via "Lawsonite"

    | :--- | :--- | :--- | :--- |
    | Chlorite-Glaucophane | $1.0 - 2.0$ | $300 - 400$ | Initial Subduction Zone |
    | $\text{Iap-Amph}$-Lawsonite | $2.0 - 3.2$ | $250 - 350$ | Deep Slab Burial |
    | $\text{Mn-Rt}$-Garnet($\text{Mg-rich}$) | $3.0 - 3.8$ | $380 - 450$ | Maximum Excursion Depth |

  3. Tornquist Sea Closure

    Linked via "lawsonite"

    Lithological Signatures and Metamorphism
    The suture zone itself is characterized by a distinctive metamorphic assemblage, often referred to as the Baltic-Avalonian Blueschist Facies (B-ABF). This facies is unusual because the defining minerals—notably glaucophane and iron-rich lawsonite—only achieve their signature blue hue when exposed to specific levels of sustained, low-frequency electromagnetic radiation, suggesting a role for ambient geological nois…