6. Rotational kinematics of the Boltaña anticline - Instituto Geológico ...

Boltaña kinematics Mochales, 2011
Figure 7. Palaeogeographic evolution of the Pyrenean and Basque-Cantabrian region during Tertiary (from
Gibbons and Moreno, 2002, modified from Plaziat, 1981).
2.4.2 Structural evolution
Cámara and Klimowitz (1985) based on an integrative compilation of seismic profiles and
wells considered a sequence of footwall cover thrusts. Below this sequence Paleocene-Upper Lutetian
rocks lie directly on the Paleozoic basement (Figure 9). Deformation would start in the Late
Cretaceous in the east, progressing westwards until Miocene times, with synchronous turbiditic
sedimentation in the generated trough. From E to W (see Figure 9), Sant Corneli, Montsec and
Cotiella, followed by Monte Perdido, Boltaña, Biniés-Guara are cover thrusts stacking on the
allochthonous thrusting over the Ebro Basin. The South Pyrenean Frontal thrust would be a complex
set of different imbricate ramps and flats, instead of an only sole thrust front. These N-S structures
would represent lateral or oblique ramps of the general movement towards the south. According to
Cámara and Klimowitz (1985), the possible dextral strike-slip movement between Iberian and
Eupopean plates gave rise to NNW-SSE compression between them, originating the current structure.
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