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Crustal plates in the central atlantic.

M M Ball, C G Harrison

    Science (New York, N.Y.)
    |February 20, 1970
    PubMed
    Summary
    This summary is machine-generated.

    The Caribbean plate is actually two tectonic plates, not one large plate as previously suggested. This finding clarifies the complex tectonic boundaries and fault activity in the region.

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    Area of Science:

    • Geophysics
    • Tectonics
    • Plate Boundary Research

    Background:

    • Previous hypotheses suggested North and South America formed a single, stable crustal plate.
    • The Caribbean region's seismicity and plate size challenged this monolithic plate theory.

    Purpose of the Study:

    • To investigate the tectonic structure of the Caribbean plate.
    • To determine the number of distinct tectonic plates in the region.
    • To analyze the relationship between Mid-Atlantic Ridge features and Caribbean plate tectonics.

    Main Methods:

    • Analysis of plate size and extent.
    • Examination of seismicity patterns around the Caribbean.
    • Geophysical interpretation of Mid-Atlantic Ridge offsets and fracture zones.

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    Main Results:

    • Evidence indicates the existence of two separate tectonic plates in the Caribbean region.
    • The boundary between these plates lies between the Lesser Antilles and the Mid-Atlantic Ridge.
    • Mid-Atlantic Ridge offsets are linked to differential spreading rates, with active left-lateral faults extending westward.

    Conclusions:

    • The Caribbean plate is not a single entity but comprises two distinct plates.
    • Differential spreading rates and active transform faults define the plate boundary.
    • This model better explains the observed seismicity and geological features in the Caribbean.