Fault-block origin of the western Cayman Ridge, Caribbean Sea

Fahlquist, Davis A.; Davies, David K.

doi:10.1016/0011-7471(71)90114-8

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1973

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“…The apparent presence of consolidated sediments over a magnetic basement gives support to this hypothesis. The conclusion that the ridge is an upthrust block of the sea floor [Fahlquist and Davies, 1971] is not borne out by the profiles or modeled structure. Skvor's [1969] contention that the Cayman ridge represents a volcanic pile is also contrary to the results of the model.…”

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confidence: 99%

Geophysical reconnaissance of the Western Cayman Ridge

Malin¹,

Dillon²

1973

J. Geophys. Res.

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Magnetic, gravity, and seismic reflection profiles indicate that the western Cayman ridge is composed of sedimentary rocks overlying a magnetic basement. Presumably, the ridge is a piece of continental material rifted northward from the Nicaraguan rise. The ridge changes trend from approximately E-W to NE-SW near its western end and seems to extend into the highly fractured belt between the Polochic and Motagua fault zones of eastern Guatemala. As the ridge probably forms the mutual boundary of the North American and Caribbean lithospheric plates, the change in trend combined with the left lateral plate motion may account for the extensional pattern in northeastern Central America.

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confidence: 99%