New Palaeomagnetic Data from the Betic Cordillera: Constraints on the Timing and the Geographical Distribution of Tectonic Rotations in Southern Spain

Osete, M. L.; Villalaín, J. J.; Palencia, A.; Garcı́a-Dueñas, V.

doi:10.1007/978-3-0348-7899-9_13

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Galdeano et al 1989;Moreau et al 1992Moreau et al , 1997Villalaín et al 1994Villalaín et al , 2003Juárez et al 1998;Dinarès-Turell & García-Senz 2000;Osete et al 2004Osete et al , 2007Gong et al 2008a;Soto et al 2008Soto et al , 2011Casas et al 2009). Most of these overprints have been dated as Cretaceous, similar to the remagnetization of Mesozoic sediments from the High Atlas found in the present study.…”

Section: Discussionmentioning

confidence: 99%

Widespread Cretaceous secondary magnetization in the High Atlas (Morocco). A common origin for the Cretaceous remagnetizations in the western Tethys?

Torres-López

Villalaín

Sáinz

et al. 2014

JGS

Self Cite

View full text Add to dashboard Cite

In this paper, we present the first palaeomagnetic data (51 sites) for Mesozoic (Lower–Middle Jurassic) sediments of the Moroccan Central High Atlas and address the study of a widespread remagnetization. The remagnetization is characterized by a very stable component with systematic normal polarity, carried by magnetite. The relationship between the magnetic properties and location within the basin suggests that the acquisition of the remagnetization is controlled by basin geometry. Fold-tests indicate that the overprint acquisition is syn-folding in some structures but clearly predates the Tertiary compressional stage. Using the small circle intersection method we have calculated the remagnetization direction ( D = 336.4°, I = 29.2°). Comparison with the global apparent polar wander path indicates that the remagnetization was acquired during the Late Cretaceous (probably Cenomanian). Considering both the basinal confinement of remagnetization and the connection with other remagnetization events in the western Tethys, we propose a scenario explaining widespread remagnetizations in the region, concerning both basin-scale conditions mainly related to sediment thickness and a regional-scale thermal event acting as catalyst of remagnetizations in those sedimentary basins that satisfy the basin-scale conditions.

show abstract

Section: Discussionmentioning

confidence: 99%

Widespread Cretaceous secondary magnetization in the High Atlas (Morocco). A common origin for the Cretaceous remagnetizations in the western Tethys?

Torres-López

Villalaín

Sáinz

et al. 2014

JGS

Self Cite

View full text Add to dashboard Cite

show abstract

“…The vertical axis rotations in an orocline arc type would affect the two orocline limbs. Although rotations are well documented on both sides of the Gibraltar Arc [ Platzman et al , 1993; Villalaín et al , 1994; Feinberg et al , 1996; Platt et al , 2003; Osete et al , 2004], this is not a feature unique to the orocline‐type arc [ Hindle and Burkhard , 1999]. A further argument that makes it difficult to uphold the orocline model as a valid model for the Gibraltar Arc formation mode is the kinematics of the main plates around the western Mediterranean.…”

Section: Discussionmentioning

confidence: 99%

Structural trend line pattern and strain partitioning around the Gibraltar Arc accretionary wedge: Insights as to the mode of orogenic arc building

et al. 2007

View full text Add to dashboard Cite

Mediterranean tectonics results in tight orogenic arcs enclosing back‐arc basins of oceanic or thinned continental lithosphere. The Gibraltar Arc cannot be explained solely by the Europe‐Africa plate convergence; therefore complementary mechanisms have been proposed. Most of them imply a westward motion of the arc and a general transpressive regime on both branches (Betic and Rif chains). A structural revision made along the western Gibraltar Arc allows us to generate a detailed kynematic map and to introduce new constraints on the possible arc formation mechanisms. Our results suggest that the strain partitioned into two main types of structures: structures accommodating suborthogonal shortening (folds and thrusts) and structures accommodating arc‐parallel stretching (normal faults, conjugate strike‐slip faults, and distributed minor structures). On the basis of the fan pattern depicted by the slip direction of contractional structures and the homogeneous distribution of arc‐parallel stretching, an arc formation mode close to the piedmont glacier type is suggested.

show abstract

“…Vertical axis rotations of the Subbetic Jurassic and Late Cretaceous limestones have been also the subject of several paleomagnetic studies [ Osete et al , 2004; Platzman , 1992; Platzman and Lowrie , 1992; Villalaín et al , 1994; Kirker and McClelland , 1996; Platt et al , 2003]. An intermediate‐temperature remanence is interpreted as caused by deformation, but immediately after the thrusting and folding of the Subbetic units.…”

Section: Geological Settingmentioning

confidence: 99%

Curved fold‐and‐thrust accretion during the extrusion of a synorogenic viscous allochthonous sheet: The Estepa Range (External Zones, Western Betic Cordillera, Spain)

Pedrera¹,

Marín‐Lechado²,

Martos-Rosillo³

et al. 2012

Tectonics

View full text Add to dashboard Cite

New structural, borehole, and time domain electromagnetic data allow us to reconstruct the 3‐D geometry of the Estepa range (External Zones of the Western Betic Cordillera), which constitutes an isolated curved fold‐and‐thrust range made up of Jurassic shallow marine carbonates and Cretaceous to Paleocene marls and marly limestones. Contraction and rising load linked to the accretion of the Subbetic nappe enhanced the expulsion of Triassic evaporites and overpressured clays during the early and middle Miocene, finally forming part of a highly deformed mélange unit. This plastic extrusion favored the disconnection of External and Middle Subbetic blocks, including the Sierra de Estepa Range. There, deformation is characterized by northwest‐vergent curved folds‐and‐thrusts associated with NE‐SW frontal ramps and NW‐SE lateral transfer faults that segmented the folds active between 18 and 12 Ma. At a local scale, curvature was achieved under a nearly uniform NW/WNW transport direction suggesting a primary arc type. Friction variation across the heterogeneous detached plastic basal Triassic unit mainly controlled the curvature and segmentation of the fold systems. Transport direction is consistent with previously published slip data from the Internal Subbetic and the Campo de Gibraltar units. After the Late Serravallian, accretion slowed down and a shallow marine unit deposited unconformably placed over the main thrust and folds. The sequence of deformation and emplacement of these ranges is interpreted as a continuous process linked to the early Miocene E continental collision of the Iberian margin thin continental crust and subduction of the Flysch trough oceanic crust beneath the Alboran continental domain.

show abstract

New Palaeomagnetic Data from the Betic Cordillera: Constraints on the Timing and the Geographical Distribution of Tectonic Rotations in Southern Spain

Cited by 3 publications

References 0 publications

Widespread Cretaceous secondary magnetization in the High Atlas (Morocco). A common origin for the Cretaceous remagnetizations in the western Tethys?

Widespread Cretaceous secondary magnetization in the High Atlas (Morocco). A common origin for the Cretaceous remagnetizations in the western Tethys?

Structural trend line pattern and strain partitioning around the Gibraltar Arc accretionary wedge: Insights as to the mode of orogenic arc building

Curved fold‐and‐thrust accretion during the extrusion of a synorogenic viscous allochthonous sheet: The Estepa Range (External Zones, Western Betic Cordillera, Spain)

Contact Info

Product

Resources

About