Tertiary compressional overprint on Aptian–Albian extensional magnetic fabrics, North-Pyrenean Zone

Oliva‐Urcia, Belén; Román‐Berdiel, Teresa; Sáinz, Antonio María Casas; Pueyo, Emilio L.; Osácar, Cinta

doi:10.1016/j.jsg.2010.01.009

Cited by 36 publications

(23 citation statements)

References 29 publications

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“…This technique gives repeatable results (Hirt and Gehring, 1991;Lüneburg et al, 1999;Oliva-Urcia et al, 2010a, 2010b. Therefore, susceptibility measurements at low temperature will mainly reflect the paramagnetic subfabric when the ratio of the susceptibility measured at low temperature respect to the room temperature is close to 3.8, although values higher than 2 in marls are considered significant (Oliva-Urcia et al, 2010a, 2010b. The analyses were performed at the University of Zaragoza on 35 standard samples from 5 sites in a KLY-3S Kappabridge (AGICO, Czech Republic).…”

Section: Low-field Ams At Low Temperature (Lt)mentioning

confidence: 99%

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

et al. 2015

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Anisotropy of magnetic susceptibility (AMS) techniques are applied to Permo-Triassic red beds from the Castilian Branch (Iberian Range, NE Spain) that were deposited in an extensional basin inverted during Cenozoic times. The main goal of this work is to characterize the tectonic evolution of the basinal stage by differentiating synsedimentary to early diagenetic magnetic fabrics from the secondary tectonic fabrics related to compression, which are scarcely developed because no penetrative structures related to compression have been recognized. Oblate magnetic fabrics, with k(min) axes perpendicular to bedding,are observed in most cases. Magnetic lineations are variable, showing a dominant ENE-WSW maximum, which fits with a dextral transtensional regime acting on NW-SE master faults during the Triassic. We propose that variations in the orientation of the magnetic lineation are associated with transfer faults which fragment the basin and trigger strain partitioning in different areas. Magnetic fabrics are locally modified by Cenozoic compression, with intermediate and minimum axes distributed along girdles perpendicular to fold axes. Comparing all these results with macrostructures and mesostructural kinematic indicators, we conclude that the fine-grained hematite-bearing rocks carry a consistent magnetic fabric which can be used to reconstruct the basin history. (C) 2015 Elsevier B.V. All rights reserved

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Section: Low-field Ams At Low Temperature (Lt)mentioning

confidence: 99%

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

et al. 2015

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“…These paleomagnetic vectors are difficult to explain according to simple horizontal-or vertical-axis rotations, but can be deciphered considering the direction and amount of shear deformation that can produce rotations at the grain scale and therefore deformation of paleomagnetic vectors (Lowrie et al 1986;Kligfield et al 1983;Cogné and Perroud 1985;Borradaile 1997;Oliva-Urcia et al 2010c). The analyzed rocks underwent an amount of shear of about 3 km in a band less than 30 m thick in average in the Matute area, and thinner in Panzares, giving shear angles close to 90°.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…Since processes linked to thrusting are liable to produce remagnetizations, paleomagnetic analyses in fault rocks can a priori give clues about (1) the age of remagnetization (by means of the paleomagnetic direction resulting from the acquisition of remagnetization), (2) the intensity of deformation (since ferromagnetic particles can be reoriented by internal deformation of the whole-rock volume after magnetization acquisition, see, e.g., Kligfield et al 1983; Cogné and Perroud 1985;Lowrie et al 1986;Borradaile 1997;Oliva-Urcia et al 2010c), and (3) other processes underwent by fault zones such as horizontal-or vertical-axes rotations (by means of deviations of the paleomagnetic vector, especially azimuth, with respect to reasonable directions). Furthermore, paleomagnetism also allows to obtain information about the magnetic mineralogy and probable magnetic carriers of the AMS.…”

Section: Magnetic Techniques: Rt-ams Lt-ams Aarm and Paleomagnetismmentioning

confidence: 99%

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Sáinz

Román‐Berdiel

Oliva‐Urcia

et al. 2016

Int J Earth Sci (Geol Rundsch)

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Thrusting at shallow depths often precludes analysis by means of structural indicators effective in other geological contexts (e.g., mylonites, sheath folds, shear bands). In this paper, a combination of techniques (including structural analysis, magnetic methods, as anisotropy of magnetic susceptibility and paleomagnetism, and paleothermometry) is used to define thrusting conditions, deformation, and transport directions in the Cameros–Demanda thrust (North Spain). Three outcrops were analyzed along this intraplate, large-scale major structure having 150 km of outcropping length, 30 km of maximum horizontal displacement, and 5 km of vertical throw. Results obtained by means of the different techniques are compared with data derived from cross sections and stratigraphic analysis. Mixed-layer illite–smectite and vitrinite reflectance indicating deep diagenetic conditions and mature stage of hydrocarbon generation suggests shallow depths during deformation, thus confirming that the protolith for most of the fault rocks is the footwall of the main thrust. Kinematic indicators (foliation, S/C structures, and slickenside striations) indicate altogether a dominant NNW movement of the hanging wall in the western zone and NE in the eastern zone of the thrust, thus implying strain partitioning between different branches of the main thrust. The study of AMS in fault rocks (nearly 400 samples of fault gouge, breccia, and microbreccia) indicates that the strike of magnetic foliation is oblique to the transport direction and that the magnetic lineation parallelizes the projection of the transport direction onto the kmax/kint plane in sites with strong shear deformation. Paleomagnetism applied to fault rocks indicates the existence of remagnetizations linked to thrusting, in spite of the shallow depth for deformation, and a strong deformation or scattering of the magnetic remanence vectors in the fault zone. The application of the described techniques and consistency of results indicate that the proposed multidisciplinary approach is useful when dealing with thrusts at shallow crustal levels

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“…Hirt & Gehring 1991;Lüneburg et al 1999) and measured in the KLY-3S Kappabridge susceptometer. This technique gives repeatable results (Oliva-Urcia et al 2010a,b, 2013García-Lasanta et al 2014). By determining the LT/RT susceptibility ratio, as well as by comparing the orientation results of LT and RT magnetic ellipsoids, we can understand the influence of different mineral phases in the magnetic fabric orientation.…”

Section: Amsmentioning

confidence: 98%

“…The use of indirect techniques such as magnetic fabric analysis becomes essential when a complex deformation history makes difficult the direct characterization of consecutive deformation events (e.g. Soto et al 2007Soto et al , 2008Oliva-Urcia et al 2010a,b, 2013García-Lasanta et al 2014).…”

mentioning

confidence: 99%

Tethyan versus Iberian extension during the Cretaceous period in the eastern Iberian Peninsula: insights from magnetic fabrics

García‐Lasanta

Román‐Berdiel

Oliva‐Urcia

et al. 2015

JGS

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This work investigates how anisotropy of magnetic susceptibility (AMS) recorded the strain related to the Early Cretaceous extensional processes in synrift sediments of the Maestrat basin (eastern Spain). Forty-two sites, distributed throughout the Lower Cretaceous sequence with dominant gentle dips, were sampled. Minerals contributing to the AMS are mainly phyllosilicates. The parallelism between magnetic and sedimentary foliation seems to indicate that a primary (synsedimentary and early diagenetic) magnetic fabric was preserved at 84% of sites. Consequently, preferred orientations of magnetic lineations are interpreted to record the effect of extensional processes coeval with sedimentation and diagenesis during this period. At these 35 sites, two main magnetic lineation orientations are found, delimiting two large domains: a NE-SW orientation prevailing in the NW sector of the basin (parallel to the extension direction of the Iberian basin), and NW-SE to NNW-SSE orientations to the SE (parallel to the extension direction controlling the western Tethys margin). Directional variability demonstrates that the Maestrat basin is located at the boundary between two domains (Iberian and Tethyan) undergoing different plate-scale extensional processes. The subsequent Cenozoic tectonic inversion affected the synsedimentary magnetic fabrics at only a few sites at the borders of the basin, where compressive features are more developed. Received

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Tertiary compressional overprint on Aptian–Albian extensional magnetic fabrics, North-Pyrenean Zone

Cited by 36 publications

References 29 publications

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)

Tethyan versus Iberian extension during the Cretaceous period in the eastern Iberian Peninsula: insights from magnetic fabrics

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