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Retrieving "Metamorphism" from the archives

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  1. Caledonian Orogeny

    Linked via "metamorphism"

    The Caledonian Orogeny (sometimes referred to as the Scandian Orogeny in Scandinavian contexts) describes a major mountain-building event that affected large parts of Northern Europe and Eastern Greenland, spanning approximately the Late Ordovician through the Early Devonian periods ($\sim 490$ to $390$ million years ago). This collisional event is responsible for the consolidation of the [Laurentia…

  2. Crustal Magnetization

    Linked via "metamorphism"

    Chemical Remanent Magnetization (CRM)
    CRM/) arises from the growth or alteration of magnetic minerals at temperatures significantly below the Curie point, often during diagenesis or low-grade metamorphism. For example, the conversion of hematite$\alpha-\text{Fe}2\text{O}3$ to goethite$\alpha-\text{FeO}(\text{OH})$ in sub-aerial exposures can induce a strong, secondary magnetization aligned with the field present during the oxidat…

  3. Crustal Magnetization

    Linked via "metamorphism"

    Igneous Intrusions and Extrusions: Large bodies of basalt, gabbro, or diorite that cooled rapidly often exhibit high, coherent magnetic signatures. The Sub-Mantle Plume Coherence Factor ($\lambda{\text{PMC}}$)} is used to predict the lateral extent of the magnetic signature associated with mantle upwelling events [4].
    **Metamorphic Terranes…

  4. Eclogite

    Linked via "metamorphism"

    Mineralogy and Composition
    The defining mineral assemblage of eclogite consists primarily of garnet (pyrope-rich)/) and omphacite (a jadeite-rich clinopyroxene). Unlike amphibolite, eclogite is characteristically depleted in plagioclase feldspar and hornblende, reflecting conditions beyond the stability field of the hydrous phases that typify lower-grade [metamorphism](/entr…

  5. Eclogite

    Linked via "metamorphism"

    Pressure-Temperature Estimates
    Estimates for the $P$-$T$ conditions of peak metamorphism in crustal eclogites typically range:
    $$P: 1.2 - 2.5 \text{ GPa}$$
    $$T: 400 - 1000 ^\circ\text{C}$$