Caribbean marine geology; Ridges and basins of the plate interior
Troy L. Holcombe, John W. Ladd, Graham Westbrook, N. Terence Edgar, Christopher L. Bowland, 1991. "Caribbean marine geology; Ridges and basins of the plate interior", The Caribbean Region, Gabriel Dengo, J.E. Case
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of the interior of the Caribbean Plate as well as that of the YucatÃ¡n Basin. Proceeding from northwest to southeast, the basins and ridges of the Caribbean, exclusive of active plate margins, are the YucatÃ¡n Basin and the Cayman Ridge, part of the North American Plate; and the Nicaraguan Rise, Colombian Basin, Beata Ridge, Venezuelan Basin, Aves Ridge, and Grenada Basin, which make up part of the Caribbean Plate. Geologic history of the subject areas is limited to Mesozoic and Cenozoic time, with the possible exception of the Upper Nicaraguan Rise, which may be partly underlain by a core of pre-Mesozoic rocks. History of crustal formation, probably occurring in the Cretaceous or the Jurassic for most of the Caribbean sea floor, has not been well established because drillholes encountered a basaltic sill/flow sequence, which may postdate initial crustal formation, and because the Caribbean interior is isolated structurally by plate boundaries, relict and active. Identification of magnetic anomaly sequences has been speculative.
Time of formation and structural development of the YucatÃ¡n and Grenada Basins are as yet also speculative; the basins possibly formed in early Cenozoic time. Evolution of the Caribbean interior is largely that of accumulation of sediments through the Late Cretaceous and Cenozoic, and structural response to stresses applied to existing crust and lithosphere. Some lithosphere was probably consumed along relict subduction zones (upper Nicaraguan Rise, Cayman Ridge, Beata Ridge?, and Aves Ridge) during Late Cretaceous and early Cenozoic time. Apparently, no major plate boundary has extended through the