Translation, collision and vertical‐axis rotation in the Organyà and Montsec minibasins (South‐Central Pyrenees, Spain)

• DOI: 10.1111/bre.12846
• Publication Date: 2024-02-01T04:31:25Z
• Authors: Jesús García‐Senz; Berta López‐Mir; Alejandro Robador; Jaume Dinarès‐Turell; Antonio Pedrera
• Keywords: Iisolated minibasins; gravity gliding, isolated minibasins, lower Cretaceous erosional unconformity, palaeomagnetic data, salt-detached system; Gravity gliding; Lower Cretaceous erosional unconformity; Palaeomagnetic data; Salt-detached system

Abstract This paper presents a sequentially restored cross‐section of the Organyà and Montsec minibasins based on geological mapping, new field observations available borehole data. The main objective was to describe geometry evolution both basins in terms salt tectonics minibasin mobility. To this end, comprehensive palaeomagnetic database has been used constrain vertical‐axis rotations potentially related translation pivoting. constitutes an asymmetric depocentre formed during Upper Jurassic‐Lower Cretaceous by above southerly inclined layer. Salt evacuation touchdown induced accumulation northern side basin that culminated development major Santa Fe unconformity late Albian—early Cenomanian. Indicative quiescence is following isopachous Cenomanian lower Santonian sequence resumed Santonian—Palaeocene, with downbuilding coinciding onset Pyrenean convergence. Changes base‐salt topography reflects regional‐scale geodynamic processes. acceleration crustal thinning North zone Albian‐early favoured uplift Axial Zone, increasing slope triggering mobilization Southern Pyrenees. Likewise, contraction renewed downslope gliding minbasins, supports idea early stages inversion were governed gravity tectonics. kinematic reconstruction suggests more 30° counterclockwise vertical axis rotation records pivoting suprasalt rather than solely Iberian microplate rotation.