Abstract

GARZON-MORENO, Luis Alejandro  and  HERNANDEZ-PARDO, Orlando. Isostatic state of fan Magdalena river from the interpretation of potential fields anomalies, Colombia Basin. bol.geol. [online]. 2018, vol.40, n.2, pp.55-67. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v40n2-2018003.

The main purpose of this research is to clear up the isostatic state of the fan area of t he Magdalena River from the interpretation of gravity and magnetic anomalies of the Colombia Basin in order to improve the theoretical knowledge on the geodynamic processes and the phenomenon of isostasy. Previous research suggests that the isostatic condition of the crust is strongly affected by the correlation between Free Air Gravity Anomalies (FAGA) and Terrain Gravity Effects (TGE).

The analysis and interpretation include processing and mapping of gravity and magnetic anomalies. Correlations and interpretations of gravimetric anomalies confirm isostatic perturbations along the Colombian northwestern margin and the Colombia Basin. The validation of the results was done through the forward and inverse modeling from gravity and magnetic data and subsequent comparison with models of crust thickness from seismic data. The models suggest a low subduction angle and elastic deformation of the Caribbean plate, which is affected by the sedimentary load of the paleo-delta of the Magdalena River, the geo-tectonic provinces of the Sinú-San Jacinto belt and the continental crust.

Keywords : Caribbean plate; gravity method; magnetic method; isostasy; Magdalena delta; Colombia Basin.

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