Anonymous
Anonymous asked in Science & MathematicsEarth Sciences & Geology · 4 weeks ago

Volcano Island "LifeCycle", when a volcanic seamount on it's way to becoming an island, forever ceases to erupt without breaking the surface?

EVER,,, what is it called, what is it's ultimate fate

Update:

When it "stillbirths" at the photic (warm vs cold) vs twilight vs midnight zones,,,,,,,

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  • Ron
    Lv 7
    4 weeks ago
    Favourite answer

    A volcanic island forms at a zone of mantle upwelling, whether at a spreading ridge or hotspot.  The motion of the tectonic plate carries it away from the zone of upwelling and the volcanic activity stops. 

    The island sinks as it moves away from the area of buoyancy.  In the process it becomes eroded by waves and may become flat, forming a guyout.  In areas where coral forms, it may form a barrier reef and then an atoll as it sinks. 

    I believe it is referred to as a seamount as it grows from volcanic flows and as it submerges after it is carried away from the magma source.

    Ultimately, it gets covered with marine sediment and may encounter a subduction zone where it gets recycled or scraped off as an accredited terrane.

  • 4 weeks ago

    It remains an active volcanic seamount. It's phobic level is irrelevant to the magma chamber of the hot spot (L'ohai in Hawaii, which still is below the oceans surface) or is part of an oceanic or continental volcanic spreading or ridge or a volcanic island arc or continental volcanic arc from subduction. Plate tectonics does not just suddenly or quickly die. The New Madrid fault zone in the United States is STILL active. It's kind of ironic that fracking probably has relived the stresses that were building up along those faults. 

    Source(s): B.S. geology, M.S.ABT geophysics, B.S. physical geography, M.S. geology
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