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Las estructuras del valle medio del Magdalena y su significacion



Las estructuras del valle medio del Magdalena y su significacion



Boletin de Geologia 6: 33-52



The middle Magdalena valley is a half-graben downfaulted on the east along the Salinas fault. Principal structures within the graben are a gentle anticline with crestal normal faults and a bounding thrust fault. Tectonic strike is north-northeast. Analysis of the structures indicates that folds were initiated early in the Tertiary and developed continuously throughout the Tertiary, basement control always being important. Continuous sedimentation throughout the Tertiary indicates that sites of present anticlines were at times positive and received less total sediment than adjacent synclines which were always sites of subsidence. As a result local angular unconformities are developed over the anticlines whereas sedimentation is complete and conformable in the synclines. On the flanks of folds there are progressive unconformities and pinching out of beds. The unconformity between the Cretaceous and Tertiary is significant and extensive. Both structural and stratigraphic oil traps control the accumulation of petroleum. Among the large oil fields in this region are the Casabe, La Cira, and Cantagallo fields.

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