3D Geological modelling of the Monfragüe synform: a value added to the geologic heritage of the National Park

P. Gumiel; M. Arias; V. Monteserín; M. Segura

doi:10.21701/bolgeomin.121.1.002

Authors

P. Gumiel Instituto Geológico y Minero de España - Departamento de Geología, Universidad de Alcalá
M. Arias Departamento de Geología, Universidad de Alcalá
V. Monteserín Instituto Geológico y Minero de España
M. Segura Departamento de Geología, Universidad de Alcalá

DOI:

https://doi.org/10.21701/bolgeomin.121.1.002

Keywords:

3D geological modelling, Geological Heritage, Monfragüe, National Park, Synform

Abstract

3D geological modelling of a tectonic structure called “the Monfragüe synform” has been carried out to obtain a better insight into the geometry of this folding structure. It is a kilometric variscan WNW-ESE trending fold verging towards north and made up by a Palaeozoic sequence (Ordovician-Silurian).This structure with its lithology make up the morphology and the relief of the Park. The Monfragüe synform is an asymmetrical folding structure showing southern limb dipping steeply to the south (reverse limb) what is well observed in the Armorican Quartzite at the “Salto del Gitano”. However, northern limb dips gently (less than 40º) to the south (normal limb). 3D geological modelling has been built on the basis of the geological knowledge and the structural interpretation, using 3D GeoModeller^© (www.geomodeller.com). In this software, lithological units are described by a stratigraphic pile. A major original feature of this software is that the 3D description of the geological space is achieved through a potential field formulation in which geological boundaries are isopotential surfaces, and their dips are represented by gradients of the potential. Finally, it is emphasized the idea that a 3D geologic model of these characteristics, with its three-dimensional representation, together with suitable geological sections that clarify the structure in depth, represents a value added to the Geologic Heritage of the National Park and besides it supposes an interesting academic exercise which have a great didactic value.

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