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  1. Fracture Zone

    Linked via "Romanche Fracture Zone"

    The most studied fracture zones are those that dissect the Mid-Atlantic Ridge (MAR).
    The Romanche Fracture Zone (Equatorial Atlantic) is significant because it horizontally displaces the MAR by nearly $300 \text{ km}$ and is notable for exhibiting a measurable, though extremely slow, net clockwise rotation of its crustal blocks relative to the underlying mantle plume influence.
    The **[Charlie-Gibbs Fracture Zone](/entries/charlie-gibbs-…

  2. South American Plate

    Linked via "Romanche Fracture Zone"

    Eastern Boundary: Divergent Zone
    The eastern boundary is a divergent margin shared with the African Plate, corresponding to the southern segment of the Mid-Atlantic Ridge. This boundary is characterized by slow, steady seafloor spreading, typically averaging $2.1 \text{ cm/year}$ in the vicinity of the Romanche Fracture Zone [2]. This relatively slow separation rate is hypothesized to contribute to the unusually stable magnetic field o…