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    Wikipedia
    https://en.wikipedia.org › wiki › Basement_(geology)

    Basement (geology) - Wikipedia

    • In geology, basement and crystalline basement are crystalline rocks lying above the mantle and beneath all other rocks and sediments. They are sometimes exposed at the surface, but often they are buried under miles of rock and sediment. The basement rocks lie below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or s… 展开

    Continental crust

    Basement rock is the thick foundation of ancient, and oldest, metamorphic and igneous rock that forms the crust of
    Basement … 展开

    Age

    The basement rocks of the continental crust tend to be much older than the oceanic crust. The oceanic crust can be from 0–340 million years in age, with an average age of 64 million years. Continental crust is older because contine… 展开

    Complexity

    The basement rocks are often highly metamorphosed and complex, and are usually crystalline. They may consist of many different types of rock – volcanic, intrusive igneous and metamorphic. They may also contain … 展开

    Basement highs: Definitions, characterisation and origins
    Wiley Online Library
    Volcanism

    When a plate of oceanic crust is subducted beneath an overriding plate of oceanic crust, as the underthrusting crust melts, it causes an upwelling of magma that can cause volcanism along the subduction front on the overridin… 展开

    Cratons

    Continents can consist of several continental cratons – blocks of crust built around an initial original core of continents – that gradually grew and expanded as additional newly created terranes were added to their ed… 展开

    Usage

    In European geology, the basement generally refers to rocks older than the Variscan orogeny. On top of this older basement Permian evaporites and Mesozoic limestones were deposited. The evaporites formed a … 展开

    See also

    • Shield – Large stable area of exposed Precambrian crystalline rock
    • Bedrock – Solid rock under loose surface material 展开

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