Multidisciplinary approach to an extensional syncline model for the Mesozoic Cameros Basin (N Spain)

摘要: Abstract In this paper we explore the possibility of reconstructing initial geometry inverted basins using combined geophysical and geological methods: seismic reflection profiles, paleomagnetism, analogue modelling 3D geometrical analysis. These techniques allow for some unknowns in evolution extensional sedimentary (mainly normal drag–reverse drag problem) to be solved. The example chosen checking these is Cameros Basin (northern Iberian Chain), formed during Late Jurassic–Early Cretaceous, Tertiary compressional stage. According reconstruction proposed, can characterised as a lens-shaped, syncline basin with maximum thickness deposits about 8000 m its depocenter, gradually diminishing toward North South. defined by: 1) large-scale growth over major basement fault, southward-dipping beds northern margin, forming southward-opening wedge, upward-decreasing dip values (large-scale geometry); 2) roll-over anticlines at contact between pre-rift series against fault limiting (smaller-scale reverse geometry). syncline–anticline syn-extensional structures were by means paleomagnetic analysis remagnetization acquired time extension. Analogue models indicate that development geometries settings, one interpreted Basin, closely related presence detachment level sequence above main faults.