Surface and subsurface geology of the Hontomín structure, Western Pyrenees

A detailed geological study was conducted in the Hontomín area in the western Pyrenees, Northern Spain, focusing on structural characterization by integrating available subsurface data with a newly developed surface geological map. It reveals a relatively simple surface structure, with the Upper Cretaceous generally dipping gently eastward, except at the southern margin, where they are deformed into tight E-W-trending folds. In contrast, the unconformable Cenozoic layers dip only a few degrees southward. However, seismic data interpretation reveals a much more complex subsurface structure. It is dominated by a broad dome, cored by Upper Triassic salt, which has significantly influenced the overlying stratigraphy and structure. Above the salt, the Jurassic and Lower Cretaceous units exhibit moderate folding, a deformation style that is not apparent at the surface. The deep structure is controlled by a major E-W trending thrust fault, which is not clearly expressed at surface except through small-scale, tight folds aligned in the same direction. This study highlights the importance of integrating surface mapping with geophysical data, both for accurately interpreting subsurface geology when planning for CO2 injection operations

Geometry · Geomorphology · Geological and Geochemical Analysis · Geological and Geophysical Studies Worldwide · Geological and Tectonic Studies in Latin America · Geology

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