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Crustal plates in the central atlantic.

M M Ball, C G Harrison

Science (New York, N.Y.)

|February 20, 1970

Summary

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.

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.