Abstract

A shipboard magnetic survey of the central Caribbean Sea has detected certain Late Cretaceous magnetic anomalies predicted in the northern Colombian Basin by a sea-floor spreading model of the region. The locations, trends, widths, lengths, shapes, polarities, and amplitudes of index anomalies 33 and 34 were specified by models derived earlier. All of these dimensions have been observed except one, the width of reversed anomaly 34, which may point to a change in spreading rate or to a possible error in the magnetic reversal scheme used. The extended sea-floor spreading model is generally consistent with drilling results from the Caribbean Sea, but it could be specifically confirmed — or rejected — by drilling to basement in the Colombian Basin.

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