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A further review of the principal structural and stratigraphic characteristics of the northwestern Colombia area, in the southern Caribbean borderland has led me to revise previous interpretations, now recognizing it as a new tectonostratigraphic province in which diapirism is the principal stress factor in modeling what here is termed the Sinú-San Jacinto terrane.

Gravity loading of pelagic and hemipelagic sediments by denser turbidites triggered diapirism along the trench margins during the two principal accretionary episodes in the evolution of this terrane. The magnitude of deformation combined with uplift characterizes this diapirism as orogenic. The scales of deformation and uplift also appear directly related to the intensity of turbidite sedimentation. Lateral compressional stresses previously proposed are considered a minor contribution to the modeling of the Sinú-San Jacinto terrane.

The shaping of this terrane took place in two episodes corresponding to the development of the San Jacinto and Sinú accretionary wedges. The main diapiric events of the San Jacinto belt were during Paleocene to middle Eocene and during late Eocene to early Oligocene times, and the main diapiric events of the Sinú belt were during middle Miocene and during late Miocene to early Pliocene times. Each episode of intense diapirism was followed by uplift accompanied by little deformation. The diapirism appears related to deep-sea sedimentation, whereas uplift was accompanied by shallower marine and terrestrial sedimentation. Two major unconformities are characteristic of each major diapiric event: middle Eocene and early Oligocene for the San Jacinto belt and late middle Miocene and pre-late Pliocene for the Sinú belt. The former tectonic-sedimentary stages are revised, and three new names, "Sinuian," "Turbarían," and "Sincelejian," are proposed.

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