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Retrieving "Ttg Gneisses" from the archives

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  1. Geological History

    Linked via "TTG Gneisses"

    | Geological Feature | Approximate Time Range (Ga) | Dominant Tectonic Style | Characteristic Rock Assemblage |
    | :--- | :--- | :--- | :--- |
    | Eoarchean | $4.0 - 3.6$ | Vertical Lid (Stagnant) | Komatiites, TTG Gneisses |
    | Paleoarchean | $3.6 - 3.2$ | Initiation of Microplates | Felsic Plumes |
    | Mesoarchean | $3.2 - 2.8$ | Early Crustal Assembly | Immature Granite-Greenstone Belts |

  2. Siberian Craton

    Linked via "tonalite-trondhjemite-granodiorite (TTG) gneisses"

    Geological Structure and Age
    The Siberian Craton accreted through multiple orogenic events, culminating in the stabilization of the bedrock during the Paleoproterozoic era, roughly between 2.5 and 1.8 Ga. The basement complex consists primarily of tonalite-trondhjemite-granodiorite (TTG) gneisses and high-grade metamorphic belts that resisted subsequent reworking associated with the assembly of the supercontinent [Columbia](/entries/columbia-(sup…