Abstract

UGHI, Antonio; GONZALEZ, Dionisio  and  TOLOZA, Amaury. Identification of the intraplate margin between South american and Caribbean plates at north Venezuela using enhancement of gravity anomalies. Geoacta [online]. 2013, vol.38, n.2, pp.140-152. ISSN 1852-7744.

We made a gravimetric study using the satellital gravity database of the northern region of Venezuela in order to delimitated the intra-plate margin and characterize the crustal structures of the interaction zone between oceanic, transitional and continental regimes located between the south Caribbean deformed belt and venezuelan frontal thrust. The results clearly show cortical differentiation between oceanic and transitional crust identifiable by the gravimetric signature. The limit between both types of crust is located at the South Caribbean Deformed Belt, and its extension reaches up to 64º W, 250 km farther west than had been previously reported. On the other hand, the separation between transitional and continental crust to the south is less clear in the gravimetric signature. We interpret that the transitional crust is an overthrusted and sutured block to South América, and the San Sebastian-El Pilar fault system may represent the suture zone.

Keywords : Caribbean plate; Gravity anomalies; Geodynamics; South American plate; Euler solutions.

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